Test 2 Study Guide - Biology Test 2 Review...

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Biology Test 2 Review Questions (Chapters 4-8) 1. What are the different types and functions of filaments in the cytoskeleton? a. Microfilaments – Changes in cell shapes (actin, myosin) b. Intermediate filaments – Skeletons c. Microtubules – Move organelles from one area to another; also cell extensions (cilia and  flagella) 2. What are the differences between plant and animal cells? a. Plant Cells have: i. A cell wall ii. A central vacuole iii. Plastids (chloroplasts) 3. What are the components (and functions of those components) in the cell membrane? a. Plasma membrane i. Regulate materials moving in and out of the cell ii. Phospholipid layer iii. Fluid mosaic model – membrane made up of proteins, cholesterol, and  phospholipids b. Proteins i. Adhesion ii. Communication 4. What is the difference between an active transport protein and a passive transport protein? a. Active transport protein – Pump specific solutes across the membrane b. Passive transport protein – Serve as channels that allow substances to diffuse through  the membrane 5. Explain the difference between diffusion and osmosis.
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