AP BIOLOGY MID TERM PRETEST

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

____ 1. Biology is the study of

a. minerals. c. the weather.

b. life. d. energy.

____ 2. All organisms are composed of

a. diatoms. c. cells.

b. cellulose. d. None of the above

____ 3. Dr. Ross knew that the parasite Plasmodium was always found in the blood of malaria patients. He thought that if the Anopheles mosquitoes were responsible for spreading malaria, then Plasmodium would be found in the mosquitoes. This idea was a

a. prediction. c. theory.

b. hypothesis. d. scientific "truth."

____ 4. Scientists usually design experiments

a. with a good idea of the expected experimental results.

b. based on wild guesses.

c. in order to develop new laboratory tools.

d. All of the above

____ 5. Which of the following associations between an SI base unit abbreviation and its base quantity is incorrect?

a. A—area c. s—second

b. m—length d. mol—amount of a substance

____ 6. Atoms that have gained energy

a. have protons and neutrons that move farther apart.

b. lose neutrons from the nucleus.

c. have electrons that move to higher energy levels.

d. absorb electrons into the nucleus.

____ 7. Which of the following states of matter contain(s) particles that are tightly linked together in a definite shape?

a. solid c. gas

b. liquid d. solid and liquid

Assume that each of the atoms below requires eight electrons to fill its outer energy level.

____ 8. Refer to the illustration above. Which of the atoms is chemically stable?

a. Atom "A" c. Atom "C"

b. Atom "B" d. None of the above

____ 9. Refer to the illustration above. If Atom "B" interacted with Atom "C" to form an ionic bond, Atom "B" would

a. gain 6 electrons. c. lose 2 electrons.

b. lose 4 electrons. d. move 2 electrons into the nucleus.

____ 10. Which of the following statements most accurately describes the difference between an ionic bond and a covalent bond?

a. Atoms held together by ionic bonds separate when placed in water while atoms held together by covalent bonds do not separate in water.

b. Ionic bonds hold together atoms of two different types, while covalent bonds hold together atoms of the same type.

c. Electrons are exchanged between atoms held together by an ionic bond, but they are shared between atoms held together by a covalent bond.

d. Ionic bonds form between atoms that carry opposite charges, while covalent bonds form between uncharged atoms.

____ 11. A reaction in which the products have less energy than the reactants is

a. an endergonic reaction. c. a filamentous reaction.

b. an exergonic reaction. d. impossible.

____ 12. Refer to the graph above. Reaction "1" in the graph

a. is an energy-storing reaction.

b. requires a greater activation energy than Reaction "2."

c. may use the same initial reactant condition needed to form Product "B."

d. All of the above

____ 13. Refer to the graph above. Reaction "3" in the graph

a. probably occurred in the presence of a catalyst.

b. requires a greater activation energy than Reaction "2."

c. is the same as Reaction "1," but faster.

d. takes longer than Reaction "2."

____ 14. Refer to the graphs above. Which graph illustrates what happens during an exergonic reaction?

a. Graph "A"

b. Graph "B"

c. Both graphs; they each show a different stage of an exergonic reaction.

d. Neither graph shows an exergonic reaction.

____ 15. When a molecule gains an electron and an accompanying hydrogen atom, it has been

a. oxidized. c. digested.

b. reduced. d. inactivated.

____ 16. Buffers

a. are of relatively little importance in living things.

b. are formed when a large number of hydroxide ions are released in a solution.

c. are formed when a large number of hydronium ions are released in a solution.

d. tend to prevent great fluctuations in pH.

____ 17. A molecule that has a partial positive charge on one side and a partial negative charge on the other side is called a

a. nonpolar molecule. c. charged molecule.

b. polar molecule. d. bipolar molecule.

____ 18. Water is important to life because it

a. surrounds all cells.

b. is found inside cells.

c. influences the shape of the a membrane.

d. All of the above

___ 19. Water is a polar molecule because

a. it contains two hydrogen atoms for each oxygen atom.

b. it has a charge.

c. different parts of the molecule have slightly different charges.

d. it does not have a charge.

____ 20. Which three elements are often found in organic compounds?

a. carbon, hydrogen, and oxygen c. nitrogen, hydrogen, and oxygen

b. carbon, hydrogen, and neon d. nitrogen, chlorine, and phosphorus

____ 21. Which of the following is not true of alcohols?

a. They contain a hydroxyl group (–OH).

b. They are polar molecules.

c. They can affect processes in living things, either positively or negatively.

d. They are the only kind of functional group in organic molecules that contain oxygen.

____ 22. Animals store glucose-containing fragments in the form of

a. cellulose. c. wax.

b. glycogen. d. lipids.

___ 23. All of the following are examples of carbohydrates except

a. sugar. c. steroids.

b. cellulose. d. glycogen.

____ 24. Amino acids are monomers of

a. disaccharides. c. nucleotides.

b. proteins. d. steroids.

____ 25. Long chains of amino acids are found in

a. carbohydrates. c. proteins.

b. lipids. d. sugars.

____ 26. Amino acids are monomers of

a. disaccharides. c. nucleotides.

b. proteins. d. steroids.

____ 27. All of the following are examples of lipids except

a. saturated fats. c. cholesterol.

b. starch. d. earwax.

____ 28. Liquid fats called oils contain

a. long CH2 chains linked by double covalent bonds.

b. fat molecules lined up side-by-side.

c. many glucose molecules.

d. more hydrogen atoms than hard fats.

____ 29. Which of the following is not an organic macromolecule?

a. carbohydrate c. lipid

b. ice d. nucleic acid

____ 30. Which organic molecule below is most closely related to nucleic acids?

a. amino acids c. nucleotides

b. CH2 chains d. sugars

____ 31. Nucleic acids include

a. chlorophyll and retinal. c. lipids and sugars.

b. DNA and RNA. d. glucose and glycogen.

____ 32. The smallest units of life in all living things are

a. cells. c. cytoplasm.

b. mitochondria. d. Golgi apparatus.

____ 33. One difference between prokaryotes and eukaryotes is that

a. nucleic acids are found only in prokaryotes.

b. mitochondria are found in larger quantities in eukaryotes.

c. Golgi vesicles are found only in prokaryotes.

d. prokaryotes have no nuclear membrane.

____ 34. Which of the following is an example of a prokaryotic cell?

a. amoeba c. bacterium

b. virus d. liver cell

____ 35. A protein that fits into the cell membrane

a. has two polar end sections that bond with water.

b. floats in the cell membrane.

c. has a nonpolar middle section.

d. All of the above

____ 36. A particularly active cell might contain large numbers of

a. chromosomes. c. mitochondria.

b. vacuoles. d. walls.

____ 37. In which of the following organelles is a cell’s ATP produced?

a. mitochondrion c. Golgi apparatus

b. endoplasmic reticulum d. lysosome

____ 38. The double membrane surrounding the nucleus is called the

a. nucleolus. c. nucleoplasm.

b. nuclear wall. d. nuclear envelope.

____ 39. Refer to the illustration above. The cell uses structure "3"

a. to transport material from one part of the cell to the other.

b. to package proteins so they can be stored by the cell.

c. as a receptor.

d. to produce energy.

____ 40. Refer to the illustration above. Structure "1" is

a. the endoplasmic reticulum. c. a mitochondrion.

b. a Golgi apparatus. d. the nucleus.

____ 41. The organelles in plant cells that contain a green pigment are the

a. mitochondria. c. chloroplasts.

b. bilayer lipids. d. Golgi apparatus.

____ 42. Plant cells have large membrane-bound spaces in which water, waste products, and nutrients are stored. These places are known as

a. mitochondria. c. Golgi apparatus.

b. chloroplasts. d. vacuoles.

____ 43. Which of the following is the correct order of organization of structures in living things, from simplest to most complex?

a. organ systems, organs, tissues, cells

b. tissues, cells, organs, organ systems

c. cells, tissues, organ systems, organs

d. cells, tissues, organs, organ systems

____ 44. Which of the following is not a specialized activity found in cells of Volvox colonies?

a. photosynthesis c. movement

b. transmission of messages d. reproduction

____ 45. Diffusion takes place

a. only through a lipid bilayer membrane.

b. from an area of low concentration to an area of high concentration.

c. only in liquids.

d. from an area of high concentration to an area of low concentration.

Concentration of Water and Solutes in Four Adjacent Cells

____ 46. Refer to the illustration above. Which cell is most likely to lose both water molecules and solute molecules as the system approaches equilibrium?

a. cell "A" c. cell "C"

b. cell "B" d. cell "D"

____ 47. Which of the following is not characteristic of facilitated diffusion?

a. It requires a carrier protein.

b. It moves substances against a concentration gradient.

c. It requires no energy input.

d. It involves a change in the shape of its carrier.

____ 48. Which of the following is true of ions and their transport across cell membranes?

a. The "gates" for ion channels are always open.

b. Ions are very small and thus can cross cell membranes readily.

c. Electrical or chemical signals may control the movement of ions across cell membranes.

d. Because they are charged particles, the movement of ions across cell membranes requires energy input.

 

 ___ 49. Refer to the illustration above. The process shown is called

a. osmosis. c. active transport.

b. facilitated diffusion. d. diffusion.

____ 50. The sodium-potassium pump usually pumps

a. potassium out of the cell.

b. sodium into the cell.

c. potassium into the cell.

d. only a potassium and sugar molecule together.

___ 51. proton pump : protons ::

a. ATP : protons c. sodium-potassium pump : ATP

b. channel : protons d. sodium-potassium pump : sodium

____ 52. Molecules that are too large to be moved across a cell membrane can be removed from the cell by

a. diffusion. c. lipid carriers.

b. exocytosis. d. osmosis.

____ 53. endocytosis : exocytosis ::

a. phagocytosis : bacteria c. cold : hot

b. secrete : exocytosis d. white blood cell : bacteria

____ 54. The process whereby plants capture energy and make complex molecules is known as

a. homeostasis. c. photosynthesis.

b. evolution. d. development.

____ 55. biochemical pathway : energy ::

a. barrier : reaction c. carrier : protein

b. match : burn d. assembly line : workers

____ 56. The sun is considered the ultimate source of energy for life on Earth because

a. all organisms carry out photosynthesis.

b. all organisms carry out cellular respiration.

c. either photosynthetic organisms or organisms that have eaten them provide energy for all other organisms on Earth.

d. the sun heats the Earth's atmosphere.

____ 57. The energy stored in food molecules in living cells is gradually released in a series of linked chemical reactions called a

a. reactant. c. chemical equation.

b. ATP generator. d. biochemical pathway.

____ 58. While energy absorbed by one type of chlorophyll molecule is used to form molecules of ATP, electrons from a second kind of chlorophyll molecule are used

a. in forming molecules of NADPH.

b. to migrate to another proton pump.

c. in the second kind of thylakoid.

d. as a fuel for forming another chlorophyll molecule.

____ 59. When photons of light strike an object, the light may be

a. reflected. c. transmitted.

b. absorbed. d. All of the above

____ 60. Flower petals have a variety of colors other than green because they possess

a. chlorophyll. c. pigments that reflect green.

b. carotenoids. d. chloroplasts.

____ 61. chloroplast : grana ::

a. photosystem : pigment molecules c. thylakoids : grana

b. chlorophyll : pigment d. chlorophyll : green

____ 62. The source of oxygen produced during photosynthesis is

a. carbon dioxide. c. the air.

b. water. d. glucose.

____ 63. During the third stage of photosynthesis, carbon-containing molecules are produced from

a. ADP.

b. carbon atoms, hydrogen atoms, and oxygen atoms from glucose.

c. carbon atoms from carbon dioxide in the air and hydrogen atoms from water.

d. carbon atoms from carbon dioxide in the air and hydrogen atoms from NADPH.

____ 64. Which of the following cannot be produced from the products of the Calvin cycle?

a. carbohydrates

b. lipids

c. proteins

d. All of the above can be produced from Calvin cycle products.

__ 65. Refer to the illustration above. Taken together, these graphs demonstrate that

a. photosynthesis is independent of environmental influences.

b. increases in light intensity cause increases in temperature.

c. as the rate of photosynthesis increases, the temperature of the plant eventually decreases.

d. the rate of photosynthesis is affected by changes in the plant's environment.

____ 66. When cells break down food molecules, energy

a. is released all at once.

b. is released entirely as body heat into the environment.

c. is temporarily stored in ATP molecules.

d. causes excitation of electrons in chlorophyll molecules.

____ 67. ATP

a. contains five phosphate groups.

b. is essential for a cell to perform all the tasks necessary for life.

c. is found only in bacteria.

d. All of the above

____ 68. The process of cellular respiration

a. is performed only by organisms that are incapable of photosynthesis.

b. breaks down food molecules to release stored energy.

c. occurs before plants are able to carry out photosynthesis.

d. occurs only in animals.

____ 69. photosynthesis : light ::

a. light bulb : glass c. automobile : gasoline

b. trunk : clothing d. country : nation

___ 70. When glycolysis occurs,

a. a molecule of glucose is split.

b. two molecules of pyruvate are made.

c. some ATP is produced.

d. All of the above

____ 71. The name of the process that takes place when organic compounds are broken down in the absence of oxygen is

a. respiration. c. fermentation.

b. oxidation. d. All of the above

____ 72. You have been growing some animal cells in culture. The cells grow well for several weeks, and then don’t seem to grow as well. You conduct some tests and

determine that there is a lot of lactic acid in the culture fluid. Which of the following is the most likely explanation for the poor condition of the cells?

a. There is too much glucose in the culture fluid.

b. There is not enough glucose in the culture fluid.

c. There is too much oxygen in the culture fluid.

d. There is not enough oxygen in the culture fluid.

____ 73. Cellular respiration takes place in two stages:

a. glycolysis and fermentation.

b. Stage 1 and Stage 2 of photosynthesis.

c. glycolysis, then oxidative respiration.

d. oxidative respiration, then reductive respiration.

____ 74. With oxygen present, the Krebs cycle and the electron transport chain

a. provide organisms an alternative to glycolysis.

b. produce most of the ATP needed for life.

c. break down glucose to produce carbon dioxide, water, and ATP.

d. All of the above

____ 75. Water is an end product in

a. lactic acid formation. c. the Krebs cycle.

b. fermentation. d. the electron transport system.

C6 H12O6 + 6O2 + ADP + P 6CO2 + 6 H2O + MOLECULE A

____ 76. The molecule referred to as Molecule "A" in the equation above is

a. NADPH. c. NADH.

b. ATP. d. ADP.

____ 77. Which of the following is the best explanation for the presence of both chloroplasts and mitochondria in plant cells?

a. In the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs.

b. If plants cannot produce enough ATP in the process of photosynthesis to meet their energy needs, they can produce it in aerobic respiration.

c. Sugars are produced in chloroplasts. These sugars can be stored in the plant for later use, converted to other chemicals, or broken down in aerobic respiration to yield ATP for the plant to use to meet its energy needs.

d. The leaves and sometimes the stems of plants contain chloroplasts which produce ATP to meet the energy needs of these plant parts. The roots of plants contain mitochondria which produce ATP to meet the energy needs of these plant parts.

____ 78. Chromatids are

a. dense patches within the nucleus.

b. bacterial chromosomes.

c. joined strands of duplicated genetic material.

d. prokaryotic nuclei.

____ 79. Which of the following is not a true difference between the chromosomes of eukaryotes and those of prokaryotes?

a. Eukaryotic chromosomes are linear, while those of prokaryotes are circular.

b. Eukaryotic chromosomes are associated with histones, while those of prokaryotes

are not.

c. Eukaryotes usually have more than one chromosome, while prokaryotes have only one chromosome.

d. Eukaryotic chromosomes contain DNA, while prokaryotic chromosomes contain a different form of genetic material.

____ 80. A student can study a karyotype to learn about the

a. molecular structure of a chromosome.

b. genes that are present in a particular strand of DNA.

c. medical history of an individual.

d. chromosomes present in a somatic cell.

____ 81. Refer to the illustration above. The cell in diagram "1" is in

a. metaphase. c. anaphase.

b. telophase. d. prophase.

____ 82. In plant cells, cytokinesis occurs when

a. the chromosomes make exact copies of themselves.

b. spindle fibers are formed.

c. a new cell wall forms.

d. osmotic pressure is too low.

____ 83. Mitosis is a process by which

a. DNA is replicated. c. cells grow in size.

b. cytokinesis occurs. d. a cell’s nucleus divides.

Diagrams A and B show cells from an organism with a diploid chromosome number of 4.

____ 84. Refer to the illustration above. Which of the cells will be a diploid cell at the completion of division?

a. "A" c. Both

b. "B" d. Neither

____ 85. When crossing-over takes place, chromosomes

a. mutate in the first division.

b. produce new genes.

c. decrease in number.

d. exchange corresponding segments of DNA.

____ 86. The exchange of segments of DNA between the members of a pair of chromosomes

a. ensures that variation within a species never occurs.

b. acts as a source of variation within a species.

c. always produces genetic disorders.

d. is called crossing.

____ 87. Which of the following are examples of fossils?

a. shells or old bones

b. any traces of dead organisms

c. footprints of human ancestors, insects trapped in tree sap, and animals buried in tar

d. All of the above

____ 88. The finches that Darwin studied differed in the shape of their beaks. According to Darwin, the finches probably

a. all had a common ancestor.

b. had been created by design that way.

c. were descended from similar birds in Africa.

d. ate the same diet.

____ 89. In order to fit into their habitat, the Galapagos finches had

a. not changed. c. evolved.

b. been created as superior birds. d. All of the above

____ 90. The major idea that Darwin presented in his book The Origin of Species was that

a. species changed over time and never competed with each other.

b. animals changed, but plants remained the same.

c. giraffes and peppered moths changed constantly.

d. species changed over time by natural selection.

____ 91. Which of the following is a vestigial structure?

a. the human tailbone c. flower color

b. the bill of a finch d. fossil cast

____ 92. The theory of evolution predicts that

a. closely related species will show similarities in nucleotide sequences.

b. if species have changed over time, their genes should have changed.

c. closely related species will show similarities in amino acid sequences.

d. All of the above

A Comparison of Dolphins and Sharks

___ 93. Refer to the illustration above. While the shark and dolphin are similar in appearance, they evolved independently. This is an example of

a. cladistics. c. convergent evolution.

b. phenetics. d. divergent evolution.

____ 94. Natural selection acts

a. on heterozygous genotypes. c. on phenotypes that are expressed.

b. only on recessive alleles. d. on all mutations.

____ 95. The movement of alleles into or out of a population due to migration is called

a. mutation. c. nonrandom mating.

b. gene flow. d. natural selection.

____ 96. Gene flow describes the

a. movement of genes from one generation to the next.

b. movement of genes from one population to another.

c. exchange of genes during recombination.

d. movement of genes within a population because of interbreeding.

____ 97. What type of population is most susceptible to loss of genetic variability as a result of genetic drift?

a. large populations c. small populations

b. medium-sized populations d. populations that fluctuate in size

____ 98. The type of selection that may eliminate intermediate phenotypes is

a. direction selection. c. polygenic selection.

b. disruptive selection. d. stabilizing selection.

____ 99. The large, brightly colored tail feathers of the male peacock are valuable to him because

a. they warn off potential predators.

b. they warn off potential competitors for mates.

c. they attract potential mates.

d. they attract people who provide them with food.

____ 100. The hypothesis that evolution occurs at a slow, constant rate is known as

a. gradualism. c. natural selection.

b. slow motion. d. adaptation.

Problem

101. Some scientists conducted an experiment in which they evaluated various measurements of human health in people who drank at least one cup of coffee a day. They found no significant differences in these health indicators in the subjects who drank only one cup of coffee a day and those who drank as many as 20 cups a day. They concluded that coffee has no adverse effects on human health. Write your answers to the following in the spaces below.

a. What were the independent and dependent variables in this experiment?

b. Was this a controlled experiment? If so, what were the control and experimental groups?

c. Do you agree with the conclusion the scientists’ drew from their results? Why or why not?

102. Refer to the illustration above. The graph depicts the relative energy levels of the products and reactants for the following chemical reaction: A + B C + D. Write your answers to the following in the spaces below.

a. Which substances, A, B, C, and/or D, are present at point "1" on the graph?

b. Which substances, A, B, C, and/or D, are present at point "3" on the graph?

c. Why is point "2" at a higher energy level than point "1"?

d. Why is point "3" at a lower energy level than point "1"?

e. Draw a dashed line on the graph indicating how the energy level of this reaction over time would be different if the enzyme that catalyzes the reaction were not present.

103. You are given four test tubes containing purified biological macromolecules. The test tubes are unlabeled except for a number between 1 and 4. You are told that one test tube contains a protein, one contains a lipid, one contains a carbohydrate, and one contains a nucleic acid. You then perform some tests on the macromolecules and collect the following information:

1) Test tubes #2 and #4 contain nitrogen, but the other tubes do not.

2) The contents of test tube #3 are not soluble in water, but the contents of the other test tubes are soluble in water.

3) The contents of test tube #1 can be broken down into subunits that are all exactly identical to each other.

4) The macromolecule in test tube #2 is found to have a globular shape.

What are the identities of the macromolecules present in the four test tubes? Write your answer in the space below.

104. A living cell has certain characteristics in common with a working factory. In a factory, products are assembled according to specified plans, energy is used in the assembly process, products are packaged and taken out of the factory, and a supervisor directs and oversees all of the activities occurring in the factory. Draw a model of a factory, labeling areas where the following important activities would occur: main office where supervisor keeps the plans and oversees activities, assembly line, electricity generator, packaging center, and factory doors. Next to each of your labels, write the name of the cellular organelle or structure that has a similar function. Choose the cellular organelles and structures from the list that follows: nucleus, cytoplasm, cell membrane, mitochondrion, endoplasmic reticulum, Golgi apparatus, vacuole. Write your answer in the space below.

Organisms in the genus Paramecium are unicellular protists. They have a number of characteristics also found in animals, such as the need to ingest food in order to obtain energy (they are heterotrophs) and they are surrounded by a cell membrane but not by a rigid cell wall. They have organelles found in animal cells, including nuclei, mitochondria, ribosomes, and cilia. In addition, they have star-shaped organelles, called contractile vacuoles, that collect excess water from inside the Paramecium and expel it periodically to the outside of the organism. The picture below depicts a Paramecium.

The data presented in the table below were obtained in an experiment in which paramecia were placed in different salt concentrations and the rate at which the contractile vacuole contracted to pump out excess water was recorded.

Salt concentration Rate of contractile vacuole contractions / minute

Very high 2

High 8

Medium 15

Low 22

Very low 30

105. Refer to the illustration above.

a. How can you explain the observed relationship between salt concentration and rate of contractile vacuole contraction? Write your answer in the space below.

b. If something happened to a paramecium that caused its contractile vacuole to stop contracting, what would you expect to happen? Would this result occur more quickly if the paramecium was in water with a high salt concentration or in water with a low salt concentration? Why? Write your answer in the space below.

106. A biologist conducts an experiment designed to determine whether a particular type of molecule is transported into cells by simple diffusion, facilitated diffusion, or active transport. He collects the following information:

1) The molecule is very small.

2) The molecule is polar.

3) The molecule can accumulate inside cells even when its concentration inside the cell initially is higher than it is outside the cell.

4) Cells use up more energy when the molecule is present in the environment around the cells than when it is not present.

The biologist concludes that the molecule moves across cell membranes by facilitated diffusion. Do you agree with his conclusion? Why or why not? Write your answer in the space below.

107. Scientists have been able to induce chloroplasts to produce ATP in the dark. First, they remove intact chloroplasts from plants. Next, they soak the chloroplasts in a solution with a low pH (about 4) and keep them in the dark. After a period of time, the chloroplasts are removed from the low pH solution and placed in a higher pH solution (about 8), again in the dark. ATP is soon found to be present in the higher pH solution. Write your answers to the following in the spaces below.

a. Evaluate the results of this experiment. Include an explanation of what apparently happened to the chloroplasts while they were in the low pH solution and how this enabled them to produce ATP when they were placed in the higher pH solution.

b. What occurs in chloroplasts exposed to light that was simulated in this experiment?

108. The following statements are about the molecule ATP (adenosine triphosphate). For each statement, indicate first whether it is true or false. Then, if it is false, rewrite the statement so that it is correct. Write your answers in the space below.

a. ATP is an unstable molecule.

b. Energy is released when the nitrogen-containing base in ATP is removed.

c. ATP is a form of kinetic energy.

d. ATP is the primary source of energy for chemical reactions occurring in all cells of all living organisms.

e. Energy released when ATP is hydrolyzed to ADP is used in cells by coupling this endergonic reaction to other reactions in the cell that are exergonic.

 

109. Refer to the illustration above. Amy wants to test the hypothesis that the rate of photosynthesis is directly related to the light level to which plants are exposed. She has chosen the aquatic plant Elodea as her study organism. In her experimental design, she has four different tanks in which she will place Elodea plants. Each Elodea plant will be placed inside an inverted test tube. She plans to estimate the relative rate of photosynthesis by measuring the amount of oxygen produced by plants placed under different light levels. She plans on comparing the amount of oxygen gas that collects in the top of each of the test tubes. Her experimental set-up looks like this:

Amy plans to place tank #3 next to a window in the classroom. She plans to place tank #2 ten feet away from the window. She plans to place tank #1 twenty feet away from the window. She plans to place tank #4 in the classroom's refrigerator, because it is the only place she can find that is dark. Write your answers to the following in the spaces below.

a. What is wrong with the design of Amy’s experiment?

b. What could Amy change in her experimental design to make it a better experiment?

110. You are a biologist accompanying some other scientists on an expedition in a region that has not been studied intensively. In your explorations, you come across a colony of small vertebrates that do not look familiar to you. After conducting electronic searches of worldwide data bases, you arrive at the tentative conclusion that this organism has never

been observed before. Now your job is to determine what kind of vertebrate it is by identifying its closest relatives. Identify three types of data that you would collect and describe how you would use these data to draw your conclusions. Write your answer in the space below.

 

Essay

111. Briefly discuss some of the major themes in biology that we will examine this year. Write your answer in the space below.

112. The results of an experiment do not support the hypothesis that the experiment was designed to test. Was the experiment a waste of time? Explain. Write your answer in the space below.

113. Plant growers often use sprinkler irrigation to protect crops they are growing from frost damage. The water that lands on the leaves turns to ice. How does this protect the plants from frost damage? Write your answer in the space below.

114. Why does the addition of a solute with polar molecules to one side of a membrane result in the diffusion of water? Write your answer in the space below.

115. What are autotrophs and heterotrophs? Write your answer in the space below.

116. Compare the features of mitotic metaphase, meiotic metaphase I, and meiotic metaphase II. Write your answer in the space below.

117. What role does the environment play in natural selection? Write your answer in the space below.

118. In a population of birds, 16 of 100 individuals suffer from a recessive genetic disorder that causes the feathers to fall off their wings. What proportion of the bird population are heterozygous carriers of the disorder? Write your answer in the space below.

119. Describe how you would determine the phenotype frequency of a population. Write your answer in the space below.

120. An agricultural plot of land is sprayed with a very powerful insecticide to destroy harmful insects. Nevertheless, many of the same species of insects are present on the land the following year. How might evolution theory account for this phenomenon? Write your answer in the space below.