Biology Top 101 - Weebly
Transcript of Biology Top 101 - Weebly
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Biology Top 101
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Organic Compounds• All living things are made of organic
compounds. • Contain the element Carbon• Carbohydrates, Proteins, Lipids, Nucleic
Acids
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Carbohydrates
• Monomer- monosaccharide
• Function- energy source and structure
• Tests: glucose-Benedicts starch- Iodine fructose
• Ex. Cellulose, glycogen, starch
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Lipids
• Made of fatty acids and glycerol• Function- energy storage and insulation• Tests: brown paper test • Examples: fats and steroids
Lipid vs. water
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Nucleic Acids
• Monomer- nucleotide• Function- carry
genetic information• Ex. DNA and RNA
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Proteins• Monomer- amino acids• Function- building and repairing cells,
communication, transport, and regulation• Tests- Biurets• Examples: enzymes, hemoglobin
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Enzymes• Catalysts in living things• Specific to a particular substrate• Reusable• Affected by temperature and pH
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CellsProkaryotes• Simple, no membrane
bound organelles• Bacteria only• One circular
chromosome• Includes: chromosome,
ribosomes, and plasma membrane Eukaryotes
• Membrane bound organelles
• Plants and Animals• True nucleus containing
chromosomes
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Nucleus• “Control Center”• Contains chromosomes
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MitochondriaSingular: Mitochondrion
• “Powerhouse” of the cell
• Produces energy in the form of ATP
• Site of Aerobic respiration
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Chloroplast
• Site of photosynthesis
• Plant cells; algae• Contains the
pigment chlorophyll
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Vacuole
• Storage of excess materials
• Plant cells usually contain one large vacuole
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Ribosomes
• Proteins are synthesized• Found in both prokaryotes and
eukaryotes
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Plasma Membraneaka: Cell Membrane
• Surrounds the cell• Regulates what
enters/leaves the cell
• Helps maintain homeostasis
• Made of phospholipids with embedded proteins
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Cell Wall
• Plant cells, Fungi, some Protists, & Bacteria
• Surrounds cell and provides support and protection.
• Made of cellulose in plants
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Eukaryotes
Plant• Cell wall • Chloroplast• Large central vacuole
Animal
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Cell OrganizationCell
Tissue
Organ
Organ System
Individual organism
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Cell Specialization• cells develop to perform different
functions• Regulated by genes
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Cell to Cell Communication
• Chemical Signals (hormones) can be sent from one cell to another
• Receptor proteins on the plasma membrane receive the signal
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Diffusion
• Form of passive transport (NO ENERGY NEEDED) across a membrane
• Solutes move from high concentration to low concentration
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Osmosis• Diffusion of water (also passive
transport)
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Active Transport
• Particles moving against the concentration gradient which REQUIRES ENERGY (ATP)
• Low concentration to high concentration
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ATP
• Energy storing molecule
• Can be used for quick energy by the cell
• Energy is stored in the phosphate bonds
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Photosynthesis• Water and Carbon
Dioxide used to produce Glucose and Oxygen
• H2O+CO2C6H12O6+O2
• Occurs in the chloroplast
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Aerobic Respiration• Used to release
energy (ATP) for cellular use
• C6H12O6+O2H2O+CO2
• Occurs in the mitochondria
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Anaerobic Respirationaka Fermentation
• Does not require Oxygen• also used to release energy, but not as
efficient as aerobic respiration (less ATP)• Products include CO2 and lactic acid or
alcohol • Two Types: Alcoholic Fermentation and
Lactic Acid Fermentation
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Autotroph vs. Heterotroph• Obtain energy from
the environment• Photosynthesis or
chemosynthesis• “Producers”
• Obtain energy from other living things
• “Consumers”
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DNA / RNA
• Carry genetic information• Made of a chain of nucleotides• Nucleotides contain a sugar, phosphate,
and a nitrogen base
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DNA / RNADNA• Double stranded• “Double Helix”• Four base pairs: ATGC• Sugar is Deoxyribose• Found in nucleusRNA• Single stranded• Four base pairs:
AUCG• Sugar is Ribose
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Base Pair Rule
• In DNA, Adenine always pairs with Thymine, and
Guanine always pairs with Cytosine
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Replication• Making of an
identical strand of DNA
• “semi” conservative
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Central Dogma
DNA RNA protein trait
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Transcription
• DNAmRNA• Occurs in nucleus• Complementary
mRNA strand is produced from a segment of DNA
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Translation• Connects amino acids in the correct
order to make a protein• Occurs in the cytoplasm within the
ribosomesA- amino acidB- tRNAC- anticodonD- codonE- mRNAF- RibosomeG-polypeptide
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Codon• Sequence of three mRNA nucleotides
that code for an amino acid
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Mutations• Change in DNA code • May cause a change in protein
produced• NOT always harmful
Sickle Cell Mutation
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Mitosis• Cell division• Produces two
identical diploid daughter cells
• Occurs in body cells to grow and repair
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Cancer
• Error in cell growth with causes uncontrolled cell growth
• Has environment and genetic variables
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Meiosis
• Cell division• Produces four
different haploid daughter cells (gametes)
• Occurs in sex cells to form gametes
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Crossing Over • Homologous
chromosomes exchange parts of their DNA
• Creates variation in gametes
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Nondisjunction
• Homologous chromosomes fail to separate during meiosis
• Can lead to Down Syndrome, Turners Syndrome, and Klinefelters Syndrome
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Asexual vs. Sexual Reproduction
Asexual• One parent• Identical offspring• Variation only thru
mutations• Examples: budding,
fragmentation, fission
Sexual• Two parents• Offspring different
from parents• More variation• Fertilization (fusion
of gametes)
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Inheritance
• Traits are specific characteristics inherited from parents
• Genes are the factors that determine traits
• The different forms of a gene are called alleles
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Dominant/Recessive Alleles
• Dominant alleles are expressed, if present, and recessive are hidden
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Genotypeactual alleles an individual has for a trait
Homozygous• Both alleles are the
same• Ex. BB or bb
Heterozygous• Both alleles are
different• Ex. Bb
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Phenotype• The actual characteristic displayed by
the individual (ex. brown eyes, Hemophiliac)
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Incomplete Dominance
• Heterozygote shows a blending of the dominant and recessive phenotypes
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Codominance
• Heterozygote expresses BOTH dominant and recessive traits
• Ex. Roan animals
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Polygenic Traits
• Traits are influenced by more than one gene
• Ex. skin color
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Multiple Alleles
• More than two alleles for a trait (an individual still only inherits two)
• Ex. Blood Type (IA,IB, i)type A = IAIA or IAitype B = IBIB or IBitype AB= IAIB
type O = ii
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Sex Linked Traits
• Sex Chromosomes– Female = XX– Male = XY
• Sex linked traits are carried on the X chromosome
• Ex. Hemophilia, red-green colorblindness
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Test Cross• used to determine the phenotype of an
unknown dominant individual• uses a homozygous recessive individual
as the “test”
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Pedigree
• similar to a family tree• Shows pattern of inheritance of a
specific trait through a family
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Karyotype• Picture of someone's
chromosomes• Can detect
chromosomal disorders
Ex. Down Syndrome, Klinefelter’s Syndrome, and Turners Syndrome
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Human Genome Project
• Sequencing of human DNA
• Being used to develop gene therapies
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Gel Electrophoresis• Technique used to
separate molecules (DNA or proteins) based on their size
• Sometimes called a DNA fingerprint
• Used to analyze and compare DNA
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Recombinant DNA• Cell with DNA from
another source• Bacteria used to
produce human insulin
• Human gene inserted into bacterial plasmid
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Transgenic Organism• An organism with a
gene from another source
• used to improve food supply, research, and healthcare
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Clone• An organism made from one cell of
another organism• A genetically identical copy
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Origin of Life
• Abiotic earth LACKED Oxygen• Early organims anaerobic prokaryotes
Miller and Urey Experiment recreating The abiotic atomospere
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Endosymbiotic Theory• Eukaryotic cells evolved from prokaryotes • Early prokaryotes engulfed other
prokaryotes and developed symbiotic relationships
• Evidence includes mitochondria and chloroplast have prokaryotic type DNA
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Abiogenesis• Living from non-living or
spontaneous generation• Disproved by Redi and
Pasteur’s experiments
Biogenesis• Living from Living
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Natural Selection• Theory of Evolution• Fit organisms
survive, reproduce, and pass on traits
Requirements:• Variation• Competition
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Adaptations• Trait that increases
survival• For Example,
– Beaks that make it easier to eat insects
– Bright flowers to attract pollinators
– Vascular tissue in plants to adapt to life on land
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Evidence for Evolution• Fossil Record• Biochemical Similarities• Shared anatomical
structures
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Speciation
• Evolution of a new species
• must be isolation between populations
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Antibiotic and Pesticide Resistance
• Populations will eventually become resistant to pesticides and antibiotics with overuse
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Coevolution
• Two organisms evolve in response to each other
Ex. Flowering plants and their pollinators
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Binomial Nomenclature
• Two word naming system• Scientific name• Uses Genus and Species names• Ex. Dogs: Canis familiaris
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Dichotomous Keys
• Used to identify organisms• Paired set of questions with two choices
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Levels of Organization
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Phylogenic tree
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Protists• Unicellular Eukaryotes• Can be autotrophic or heterotrophic• Reproduce mostly asexually
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Fungi
• Multicellular (most)
• eukaryotes (yeast are the only unicellular fungi)
• Heterotrophs• Reproduce
asexually and sexually
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Plants
• Multicelluar eukaryotes• Autotrophs• Reproduce sexually and
asexually
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Animals
• Multicellular eukaryotes
• Heterotrophs• Reproduce
sexually and asexually
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Non Vascular Plants• Also called
Bryophytes• No true roots or
vascular tissue causing them to be small in size
• Must live in moist environments
• Reproduce with spores
Ex. Mosses, liverworts
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Gymnosperms
• Non-flowering vascular plants
• Reproduce with cones that contain
seeds• Ex. Conifers (pine
trees)
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Angiosperms
• Flowering vascular plants
• Flower is main reproductive organ
• Seeds are enclosed within a fruit
• Ex. Deciduous plants
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Insects• Transport through open
circulatory system• Exchange gases through
spiracles and tracheal tubes
• Most reproduce sexually with internal fertilization
• Develop through metamorphosis
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Annelids(segmented worms)
• Transport through closed circulatory system
• Exchange gases through moist skin• Reproduce asexually and sexually with
internal fertilization
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Amphibians• Transport through a closed
circulatory system involving a three chambered heart
• Gas exchange in young with gills, adults lungs and moist skin
• Reproduce sexually with external fertilization
• Develop through metamorphosis
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Mammals
• Transport though closed circulatory system involving a four chambered heart
• Gas exchange through lungs• Reproduce sexually with internal
fertilization• Young develop in a uterus and exchange
nutrients and oxygen through the placenta (placental mammals)
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Viruses
• Not considered living things• Pathogens that can mutate to resist
vaccines• Ex. HIV, Influenza, Smallpox
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Genetic Disorders and the Environment
• Many diseases have both genetic and environmental factors
• Ex. Cancer, diabetes, PKU
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Immune ResponseB-cells
• Fight antigens in body fluids
• B-cells make antibodies
• Make memory cells after exposure to antigen
T-cells
• Fight pathogens inside living cells
• May help B-cells to make antibodies
• Make memory cells after exposure to pathogen
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Immunity
Passive Immunity• Antibodies are
introduced into the body
• Short term• Such as mother
transfers antibodies to infant through breast feeding
Active Immunity• Antibodies are acquired
when an immune response is activated in the body
• Long term• Ex. Vaccines are
weak/dead antigens that are introduced to the body
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Parasites• Lives on or within a
host• Benefits while
causing harm to the host
• Ex. Plasmodium causes malaria (genetic influence- carriers of sickle cell are resistant to malaria)
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Toxins
• Chemical that causes harm to the body
• Can be man-made or produced by microorganisms
• Ex. Mercury and Lead
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Ecosystems• Collection of
abiotic (nonlivng) and biotic (living) factors in an area
• Together they influence growth, survival, and productivity of an organism
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Symbiotic Relationships• Relationship
between two organisms in which one benefits
• Types:– Mutualism (+,+)– Parasitism (+,-)– Commensalism (+, o)
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Predation• Predator eats prey• Evolve in response to
one another
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Carrying Capacity• Maximum number of
individuals that an ecosystem can support
• Limiting factors:– Food availability– Competition– Disease– Predation– Natural Disasters
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Carbon Cycle
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Trophic Levels • Steps in a food
chain/web• Energy passes from
one organism to another
• About 10% of the energy at one level passes to the next
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Human Population• Growth= birth rate-death rate
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Human ImpactsPositive
• Reforestation• Cover Cropping• Recycling• Sustainable practice
Negative• Acid Rain• Deforestation• Habitat Destruction• Invasive Species• Ozone depletion from
the release of CFCs
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Global Warming
• Increase in the average temperature of the earth
• Caused by the release of too much CO2 into the atmosphere which amplifies the greenhouse effect
• Burning of fossil fuels, volcanic eruptions
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Bioaccumulation
• An increase in environmental toxins at higher tropic levels
• Ex. DDT and birds of prey
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Innate Behavior• Behaviors an animal is
born with• Includes suckling,
migration, hibernation• Ex. weaving of spider
webs
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Learned Behavior
• Behavior an animal acquires during its lifetime
• Includes– Habituation– Conditioning– Trial and error
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Social Behavior
• Communication between individuals of the same species
• Can be courtship, territorial or chemical (pheromones)