311C S12 Exam2PQ - Bio311C Exam 2: Practice Questions...

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Bio311C Exam 2: Practice Questions Multiple Choice. 1. Which of the following correctly matches the cytoskeletal element with its function? a. Microfilaments: make up the nuclear lamina that maintains the structure of the nucleus b. Microtubules: cell plate formation during cleavage c. Microtubules: muscle contraction d. Microtubules: chromosome movement during cell division e. Intermediate filaments: cytoplasmic streaming 2. Which of the following can best be used to distinguish a plant cell from an animal cell. a. Ability to communicate by cell communication. b. Presence or absence of centrosomes. c. Presence or absence of microtubules. d. Ability to transform energy. e. Presence or absence of mitochondria. 3. The selective permeability of biological membranes is dependent on which of the following? a. the type of transport proteins that are present in the membrane b. the lipid bilayer being permeable to primarily small, nonpolar molecules c. the types of carbohydrates on the surface of the membrane d. (a) and (b) only e. (a), (b), and (c) 4. Which of the following is most true regarding bulk transport across membranes. a. Pinocytosis will lead to the uptake of very specific solutes from the extracellular fluid through the formation of small vesicle. b. Endocytosis leads to an increase in the surface area of a membrane. c. Exocytosis is the general term for the bulk movement of substances out of the cell. d. Receptor mediated endocytosis activates a signal transduction cascade when the ligand binds the receptor. e. Phagocytosis is a specific type of exocytosis that results in a decrease in the surface area of a membrane. 5. Plant cells use proton pumps to actively transport H + from the cytoplasm to the extracellular fluid. The proton pump contributes to a. the H + concentration gradient b. the membrane potential c. the electrochemical gradient d. (a) and (b) e. (a), (b), and (c) 6. An important group of peripheral membrane proteins are enzymes, such as the phospholipases that catalyze the hydrolysis of membrane phospholipids. What properties must these peripheral membrane exhibit? a. Water solubility b. Both water and lipid solubility c. Resistance to degradation by phagocytosis d. Lipid solubility e. Membrane spanning domains 7. Cholesterol travels in the blood in particles called low-density lipoproteins (LDLs). These LDLs enter cells by the formation of vesicles after first binding to specific LDL receptors on the surface of some cells. This process a. Adds membrane to the plasma membrane. b. Removes membrane from the plasma membrane c. Does not change the amount of plasma membrane. d. Is an example of exocytosis. e. Is an example of passive transport. 8. Which of the following is the most likely to permeate a biological membrane by diffusing directly through the phospholipid bilayer?
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This note was uploaded on 04/02/2012 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas at Austin.

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311C S12 Exam2PQ - Bio311C Exam 2: Practice Questions...

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