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Biology 30603Cell BiologyExam IIISpring 2005

Biology 30603Cell BiologyExam IIISpring 2005 - Biology...

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B C D E Biology 30603 Cell Biology Exam III Spring 2005 1. Polycistronic mRNA is found a. Only in eukaryotes b. Only in prokaryotes c. In both prokaryotes and eukaryotes d. Nowhere in nature e. Only in mitochondrial genes 2. Which one of the following modifications occurs in bacteria and not in eukaryotes? a. capping with a 7-methyl guanosine b. splicing c. polyadenylation d. none of the above occur in bacteria e. All of the above (a, b, and c) occur only in bacteria 3. The function of telomerase is 4. Tetracycline blocks the tRNA in the A site of the ribosome. This tRNA would be covalently linked to 5. α -amanitin is a mushroom toxin that binds to and inhibits RNA polymerase II. This property can be used to 6. Heat shock proteins are a. Produced by eukaryotic cells when they are killed by heat b. What gives you heat rash in the Texas summer c. Chaperones d. Essential for transcription e. Saponins
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7. When bacteria are grown in the presence of Glucose, transcription from the Lac operon is a. Repressed b. Activated c. Unaffected d. Increased to metabolize glucose e. Decreased to metabolize lactose 8. The enzyme Primase is required for 9. Proofreading of newly replicated DNA strand is carried out by a. a. An enzyme called Proofase b. b. DNA helicase c. c. P53 d. d. DNA polymerase e. e. RNA polymerase 10. Prokaryotes do not have to contend with an ‘end-replication’ problem that requires telomerase because
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