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2006_Exam_1_Q&A - Bio2600 Introduction to Cell...

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Bio2600: Introduction to Cell Biology Name: Sept. 28, 2006 Exam 1 Section 1: Complete each sentence with one of the two words (A or B) found in the square brackets [A. /B. ]. 1. [A. True/B. False] The hydrophobic forces that hold a membrane together are essentially identical to the hydrophobic forces that drive protein folding. 2. Enzymes called flippas es are important for ensuring that lipids are [A. symmetrically/ B. asymmetrically] distributed in a plasma membrane. 3. Compared to ATP, a nucleotide, water will diffuse [A. more/B. less] rapidly into the cell. 4. Fatty acid chains that have no double bonds are considered [A. saturated/B. unsaturated]. 5. In most neurons, an ac tion potential can be detected in [A. axons/B. dendrite]. 6. Phosphorylation of a protein is a common means of [A. non-covalent/B. covalent] modification of proteins. 7. The gylcocalyx is a la yer of carbohydrates on the [A. inner/B. outer] face of a plasma membrane. 8. When using a channel protein, an ion always flows [A. up/B. down] a concentration gradient. 9. Peripheral membrane proteins in the [A. carbohydrate layer/B. cell cortex] are involved in regulating cell shape and motility. 10. Proteins commonly fold into the [A. lowest/B. highest] energy state. 11. If the membrane potent ial moves closer to zero the cell is said to be [A. depolarized/B. hyperpolarized]. 12. Action potentials are said to be "all-or-none" in character because each action potential in a given neuron [A. is always the same size & shape/B. never stops moving down an axon once it begins]. 13. At the dendritic synapses, neurons can receive excitatory stimuli using a neurotransmitter such as [A. GABA/B. acetylcholine]. 14. An example of a basic polar amino acid is [A. Arg/B. Glu]. 15. Fibrous proteins are most commonly found in [A. the cytosol/B. the extracellular matrix]. Section 2: Multiple Choice. Select the single best answer based on your understanding of Cell Biology. Page 1, v1
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16. In general, most carrier proteins A. change conformation because a phosphate group is added to it during transport of a solute. B. never reach a saturation state as the kinetics of solute uptake is linear. C. carry a solute across the membrane as dictated by the solute's concentration gradient. D. can be inhibited by addition of ATP to the outside of the cell. E. are antiporters carrying Na + ions out of the cell.
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