2008 Exam 1 Answers

2008 Exam 1 Answers - Bio2600: Introduction to Cell Biology...

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Bio2600: Introduction to Cell Biology name; Jan., 2008 Exam 1 Section 1: Complete each of the following sentences with one of the two words enclosed in square brackets [A. /B. ]. 1. In a multimeric protein, the different subunits interact together using primarily [A. covalent/B. non- covalent] interactions. 2. When using a channel protein, an ion always flows [A. up/B. down] its concentration gradient. 3. In the plasma membrane, phospholipid molecules are organized into a bimolecular layer such that the [A. polar/B. nonpolar) regions lie in the middle of the bilayer. 4. Van der Waals forces are an example of [A. non-covalent/B. covalent] interactions governing protein folding. 5. Compared to ATP, a nucleotide, carbon dioxide (CO 2 ) will diffuse [A. more/B. less] rapidly into the cell. 6. If the membrane potent ial moves closer to zero (becomes less negative) the cell is said to be [A. depolarized/B. hyperpolarized]. 7. Proteins commonly fold into the [A. lowest/B. highest] energy state. 8. At the dendritic synapses, neurons can receive inhibitory stimuli using a neurotransmitter such as [A. GABA/B. acetylcholine]. 9. A normal cell is relat ively impermeable to [A. Cl- ions/B. O 2 ]. 10. Enzymes called flippas es are important for ensuring that lipids are [A. symmetrically/ B. asymmetrically] distributed in a plasma membrane. 11. Phosphorylation of a protein is a common means of [A. non-covalent/B. covalent] modification of proteins. 12. An example of a non-polar amino acid is [A. Arg/B. Ala]. 13. [A. True/B. False] The hydrophobic forces that hold a membrane together are essentially identical to the hydrophobic forces that drive protein folding. 14. [A. Yes/B. No] Is the plasma membrane of a cell still fluid if it has hundreds of transmembrane proteins anchored to the cytoskeleton? 15. Fatty acid chains that have a double bond are considered [A. saturated/B. unsaturated]. Section 2; Multiple Choice. Identify the single best answer for each question based on your knowledge of Cell Biology. Page 1, v1
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Acetylcholine gated channels freely conduct the following ions A. Na + B. K + C. Ca 2+ D. A and B E. A, B and C 17. Below is a sketch of three protein monomers with complementary binding sites as depicted by the shape of their protrusions and invaginations. Of the three, which one(s) will most likely form a long string or fibrous protein? A. A only B. B only C. C only D. A and B E. A, B and C 18. Facilitated diffusion of a given compound differs from simple diffusion because: A. it is usually more rapid B. there is a limit to its rate C. movement can be blocked by competitive inhibitors D. it is often very specific for the compound E. all of the above 19. Cholesterol A. is s lightly amphipathic. B.
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This note was uploaded on 04/27/2008 for the course BIO 2600 taught by Professor Vanburkem during the Winter '08 term at Wayne State University.

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2008 Exam 1 Answers - Bio2600: Introduction to Cell Biology...

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