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E2F1answer - BIL 150 EXAM 2-FORM 1 ANSWERS FALL 2006 1 In...

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BIL 150 FALL 2006 EXAM 2-FORM 1 ANSWERS 1. In C 4 plants PEP carboxylase is found in the _________, and in CAM plants this enzyme is found in the ________. A. mesophyll; bundle sheath B. bundle sheath; mesophyll C. mesophyll; mesophyll D. bundle sheath; bundle sheath E. roots; stem Answer: C 2. A scientist clones a regulatory gene that is involved in controlling the expression of other genes, and discovers that the regulatory gene encodes a demethylation enzyme. It is likely that this enzyme regulates gene expression by _____. A. causing tighter packing of the chromatin at the target gene, thereby inhibiting transcription B. causing looser packing of the chromatin at the target gene, thereby inhibiting transcription C. causing tighter packing of the chromatin at the target gene, thereby enhancing transcription D. causing looser packing of the chromatin at the target gene, thereby enhancing transcription E. causing tighter packing of the chromatin at the target gene, thereby inhibiting translation Answer: D 3. The binding of an allosteric inhibitor to an enzyme causes the rate of product formation by the enzyme to decrease. Which of the following BEST explains why this decrease occurs? 4. Which of the following is necessary for nucleotide excision repair of DNA? 5. Which of the following describes a difference between DNA and RNA? 1
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6. Which of the following statements about replication origins is INCORRECT? A. Bacterial chromosomes have a single origin, but eukaryotic chromosomes have many origins. B. In bacteria, the DNA sequence at the origin of replication is recognized by specific proteins that then bind to the origin. C. The two strands of DNA at the origin are separated, allowing the formation of a replication bubble. D. In both prokaryotes and eukaryotes, replication proceeds in both directions from each origin. E. None of the above. Answer: E
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