UNIT 3 CHAPTER 7 A View of the Cell 61

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Plasma Membrane Use with Chapter 7, Section 7.2

Basic ConceptsBasic Concepts

Phosphate group

Phospholipidmolecule

Fattyacids

Glycerol backbone

Polarhead

Cholesterol

Membraneprotein

Filaments of cytoskeletonCytoplasm

Membraneprotein

62 CHAPTER 7 A View of the Cell UNIT 3

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Worksheet

6Worksheet

Plasma MembraneBasic ConceptsBasic Concepts

Use with Chapter 7, Section 7.2

1. Describe the phospholipid in the upper left part of the transparency.

2. Which end of a phospholipid is attracted to water?

3. How are phospholipids oriented in the plasma membrane?

4. What is the function of membrane proteins?

5. Why is the model of a membrane shown in the transparency referred to as the fluid mosaic model?

6. How would the membrane shown in the transparency behave if its fatty acid tails consisted mostly of unsaturated fatty acids?

7. What is the function of the cholesterol molecules shown in the transparency?

UNIT 3 CHAPTER 7 A View of the Cell 63

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The Cell Use with Chapter 7, Section 7.3

Basic ConceptsBasic Concepts

Microfilaments

Typical Animal Cell

Typical Plant Cell

Cytoplasm

Chromatin

Nucleolus

Nuclear membrane

Nucleus

Microtubules

Central vacuole

Plasmamembrane

Mitochondria

Golgi apparatus

Cell wall

Nuclear membrane

Nucleolus

Chromatin

Nucleus

Chloroplast

Microfilaments

Microtubules

Cytoplasm

Endoplasmicreticulum withribosomes

Lysosome

64 CHAPTER 7 A View of the Cell UNIT 3

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Worksheet

7Worksheet

The CellBasic ConceptsBasic Concepts

Use with Chapter 7, Section 7.3

1. Which cell parts are common to both plant and animal cells?

2. Which organelle aids in digestion of worn-out cell parts?

3. Which organelle is found in plant cells but not in animal cells?

4. What is the function of the central vacuole in plant cells?

5. What would be the likely function of a plant cell that contains many chloroplasts?

6. Which plant cells might not contain any chloroplasts?

7. Which organelles are produced within the nucleolus?

8. Why would a cell that moves by means of cilia or flagella require a relatively large number of mitochondria?

UNIT 3 CHAPTER 7 A View of the Cell 65

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The Optical Microscope Use with Chapter 7, Section 7.1

Reteaching SkillsReteaching Skills

EyepiecesContain magnifying lenses to look through

Light sourceAllows light to reflectupward through thediaphragm, the specimen,and the lenses

DiaphragmRegulates the amount oflight that passes throughthe specimen

StageSupports the microscopeslide

High-power objectivesContain lenses withgreater powers ofmagnification

Revolving nosepieceHolds and turns theobjectives into viewingposition

Fine adjustmentSharpens the image underhigh and low magnification

Coarse adjustmentFocuses the image under low power

Stage clipsHolds the microscopeslide in place

Low-power objectiveContains the lens with low power magnification

Arm

66 CHAPTER 7 A View of the Cell UNIT 3

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Worksheet

9Worksheet

The Optical MicroscopeReteaching SkillsReteaching Skills

Use with Chapter 7, Section 7.1

1. What is the function of the diaphragm?

2. If you want to change the objective lens through which you are viewing a specimen,what must you do?

3. What knob is turned to focus an image under low power?

4. What is the purpose of having a light source on a microscope?

5. Explain the significance of the term compound in describing a modern light microscope.

6. Identify the parts of the microscope that are used for supporting the specimen and holding it in place.

7. If the magnifying power of an eyepiece is 10� and that of an objective is 45�, by howmuch is a specimen magnified through this combination of lenses?

8. What is the fundamental difference between a compound microscope and the simplemicroscope that van Leeuwenhoek used in the 1600s to describe living cells?

9. What major advantage does a transmission electron microscope have over a compoundlight microscope? What is its major disadvantage?