Question

BIOCHEMISTRY

2points each 1. Describe the DNA helix proposed by Watson and Crisk A) The Watson and Crick DNA model contains two DNA polymer strands coiled around a B) The strands are oriented in opposite directions, from S to 3 (antiparallel), and the two C) The sugar-phosphate backbone is located on the outside. The base pairs are stacked in the common axis. strands are twisted in a right-handed coil. center of the helix and are stabilized by specific hydrogen bonds between AT and GC base pairs. D) The base pairs lie perpendicular to the axis, with 10 base pairs per turn. The helical structure E) All of the above. repeats every 34 A. 2. Triacylglycerol stored in adipose tissue is used by the liver and other tissues for A) glycerol for pyruvate and glucose in liver B) ATP production via the citrie acid cycle in muscle. C) conversion to acetyl CoA and ketone bodies during starvation for the brain. D) All of the above. E) None of the above 3. DNA clamps A) are composed of B2 subunits. B) form a ring around the front of the fork of DNA c) allow the polymerase to move along the DNA molecule without falling off. D) All of the above. E) None of the above. 4. What function does helicase perform during replication? A) B) C) D) E) It stabilizes the negative charge of the transition state. It utilizes ATP to power strand separation. It adds negative supercoils to DNA. A and C None of the above. 5. Enzymes that digest the triacylglycerols into free fatty acids and monoacylglycerol are called A) hydrases. B) glyases. C) lipases. D) All of the above. E) None of the above.

Answer 1

URE & point s each. 1. Describe the DNA helix proposed by Watson and Crisk A) The Watson and Crick DNA model contains two DNA polymet strands coiled around a common axis B) The strands are oriented in opposite directions, from S to 3 (antiparalilel), and the two strands are twisted in a right-handed coil. C) The sugar-phosphate backbonc is located on the ousie The base pairs are stacked in the center of the helix and are stabilized by specific hydrogen bonds between AT and GC base pairs D) The base pairs lie perpendicular to the axis, with 10 hase pairs per turn. Thse helical structure repeats every 34 A All of the above. Triacylglycerol stored in adipose tissuc is gsed by the liver and other tissues for A) głycerol for pyruvate and glucose in liver. B) ATP production via the citric acid cyck in muscke. C)conversion to acetyl CoA and ketone bodies during sarvation for the brain 2. All of the above. E) None of the above 3. DNA slamps A) are composed of p2 subunit B) form a ring around the froet of the fork of DNA C)allow the polymerase to move along the DNA moleciale without falling off All of the above. None of the above. E) 4. What function does hslicase perform during replication? It utilizes ATP to power strand separation. AIt stabilizes the negative charge of the transition state. c) It adds negative supercoils to DNA D) A and C E) None of the above 5. Enaymes that sligest the triacylglycerols into free fatty acids and mososcylglycerol are called A) hydrases B) glyases. lipases D) E) All of the above. None of the above.

A) rocognition of esismotched pair by Murs B) emoval of a misnatched nacleotide by DNA poymerase 1I1 C) clkavage of the hackbone by MutH 12. ๒๕ coli, mhratchspairinvolves A and C A.B, and C rimidine dinen rilootide expansin C presser tants D) All of the aove ) None of the abv E) None of dhe above IS. How manycoands of onidarion would be reguired for a 16-carbon farty acyl chain so be degraded to acety I CoA? A) 16 B) C 7 15 Nooe of the above 16. xposure to afetcxin B can leadto B) DNA damage by alky lation. A) the expamion of repeats of thrce macleotides the defective repair of DNA D) the recombination of DNA E) None of the above 17. The chamical forces that cocaribute to the stubNlity of the DNA due to the bas.sasking preseot in ths DNA belix are hydrogen bonds B) van der Waals interactions C) dselfide bonds D) Cand B E) Nooe of the above.