Spring%20%2709 - Multiple Choice Questions (2 points each)...

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1 Multiple Choice Questions (2 points each) 1. When proteins have reached the end of their useful life in eukaryotes, they are tagged with ______(1)______ and then degraded in the ______(2)______ . (a) flavin, mitochondria (b) ubiquitin, proteasome (c) cytochrome c, ribosome (d) ubiquinone, glycososome (e) ATP, chaperonin 2. The translation of a polypeptide in a ribosome continues until a “stop” codon is reached on the mRNA, which results in termination of synthesis, but with the peptide still attached to a tRNA on the ribosome. The new polypeptide only comes off the ribosome when a ______(?)______ is bound to the A site of the ribosome. (a) single-stranded binding protein (b) new aminoacyl-tRNA (c) f-met tRNA (d) polysome termination factor (e) release factor 3. For translation initiation in E. coli , the hydrolysis of a nucleoside triphosphate is associated with the coming together of the 30 S and 50 S subunits. This nucleotide is: (a) ATP. (b) CTP. (c) GTP. (d) UTP. (e) TTP.
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2 4. Glyceraldehyde-3-phosphate dehydrogenase uses ______(?)_____ as the phosphate donor in the synthesis of 1,3-bisphosphoglycerate. (a) ATP (b) P i (c) GTP (d) all of the above (e) none of the above 5. The nitrogen cycle includes: (a) nitrogen fixation. (b) nitrification. (c) denitrification. (d) A and B. (e) A, B, and C. 6. Which of the following processes are carried out in the cytosol? (a) glycolysis, gluconeogenesis, fatty acid synthesis (b) ketogenesis, citric acid cycle, β oxidation (c) photosynthesis, DNA replication (d) all of the above (e) none of the above 7. Insulin action includes: (a) increased glucose transport into cells. (b) suppression of glycogen breakdown. (c) stimulation of triacylglycerol synthesis. (d) A and B. (e) A, B, and C.
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3 8. Repetitive sections of DNA that allow the ends of DNA to be replicated are: (a) alu repeats. (b) telomeres. (c) polymorphisms. (d) Okazaki fragments. (e) none of the above. 9. tRNA anticodons align with: (a) the anticodon on the mRNA. (b) the codon on the mRNA. (c) the anticodon on the rRNA. (d) all of the above. (e) none of the above. 10. The Shine-Dalgarno sequence: (a) aligns the tRNA to the mRNA. (b) aligns the mRNA to the ribosome. (c) aligns the tRNA to the ribosome. (d) all of the above. (e) none of the above. 11. Electron transport is coupled to oxidative phosphorylation in that: (a) ATP generated in electron transport is used to drive oxidative phosphorylation. (b) the electrons from electron transport are required for oxidative phosphorylation. (c) a proton gradient generated by electron transport drives ATP synthesis in oxidative phosphorylation. (d) the same enzymes are used in both processes. (e) coenzyme Q acts as a carrier protein for the two processes.
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4 12. Both hexokinase and glucokinase are found in the liver. Glucokinase has a Km value of 10 mM, whereas hexokinase has a Km value less than 1mM. This is consistent with: (a) glucokinase acting on glucose at low glucose concentration. (b)
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Spring%20%2709 - Multiple Choice Questions (2 points each)...

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