CH369 369finalS02 - 1. The dominant form of DNA found in...

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1. The dominant form of DNA found in the cell is the B form of DNA. Which of the following characteristics is associated with the B form of DNA? a. the sugars are located in the interior of the double helix b. the distance between base pairs along the axis of the helix is 6.8 Ǻ c. the major and minor grooves are readily apparent d. the planes of the bases make about a 20 degree angle with the helix axis 2. The successive mononucleotide units in DNA and RNA are: a. linked by hydrogen bonding through phosphodiester bridges between the 3' position of one mononucleotide and the 5' position of the next b. linked by hydrogen bonding between adenine and thymine and between guanine and cytosine c. linked covalently through phosphodiester bridges between the 3' position of one mononucleotide and the 5' position of the next d. linked covalently between adenine and thymine and between guanine and cytosine e. linked by a glycosidic bond 3. The process of "transcription" in eukaryotes involves the synthesis of: a. an RNA copy of a DNA sequence by an RNA polymerase b. a DNA copy of an RNA sequence by an RNA polymerase c. an RNA copy of another RNA by an RNA polymerase d. a DNA copy of a DNA sequence by a DNA polymerase e. an RNA copy of a DNA sequence by a DNA polymerase 4. What is the property of the chain-terminating nucleotides used in DNA sequencing that enables them to terminate the polymerizing DNA chain? a. They are radioactive. b. They lack the nucleotide base. c. They lack a 3'-hydroxyl. d. They are fluorescent. e. none of the above 5. Which of the following changes in cellular metabolite concentrations might indicate a need to speed up the net rate of glycolysis? a. increasing ATP and citrate b. increasing ADP and AMP c. decreasing glucose and AMP d. increasing citrate and pyruvate e. increasing galactose from lactose
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6. Fatty acids are activated to acyl-CoAs and the acyl group is further transferred to carnitine because: a. acyl-CoAs easily cross the mitochondrial membrane, but the fatty acids will not. b. fatty acids cannot be oxidized by FAD unless they are in the acyl-carnitine form. c. carnitine is required to oxidize NAD+ to NADH. d. acyl-carnitines readily cross the mitochondrial inner membrane, but acyl-CoAs do not. e. none of the above 7. Which of the following statements about the light reactions in photosynthetic plants is false ? a. There are two distinct photosystems, linked together by an electron transfer chain. b. A membrane-bound ATPase couples ATP synthesis to electron transport. c. The ultimate source of electrons for the process is H 2 O. d. The ultimate electron acceptor is O 2 . e. No CO 2 is fixed in the light reactions. 8. The following graph represents the allosteric regulation of a glycolytic enzyme by ATP. Identify the enzyme.
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This note was uploaded on 03/30/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH369 369finalS02 - 1. The dominant form of DNA found in...

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