Please help answer multple choice answers. 4000 points 17. If you were to chemic

Question

Please help answer multple choice answers. 4000 points

17. If you were to chemically analyze a particular region of a chromosome and determine that 20% of its of the bases in this same region would be cytosine. bases were adenine, then a. 20% b. 40% c. 60% d. 30% e. 80% 18. Which of the following are both pyrimidines? a. adenine and thymine b. cytosine and thymine c. adenine and cytosine d. guanine and thymine e. guanine and cytosine 19. In a single-stranded molecule of DNA, the nucleotides are held together in the chain by: a. hydrogen bonds b. phosphodiester bonds c. peptide bonds d. ionic bonds e. electrostatic forces 20. In DNA replication, joins DNA fragments into a continuous strand. a. DNA helicase b. DNA topoisomerase c. DNA polymerase d. DNA primase e. DNA ligase 21. In the first part of the Meselson-Stahl experiment, E. coli cells that had been grown for many generations on 15N medium were transferred to N medium for one generation. The DNA was then extracted, and the resulting cesium chloride density gradient analysis for this part of their work disproved: a. the conservative model of DNA replication b. the semiconservative model of DNA replication c. the dispersive model of DNA replication d. both the semiconservative and conservative models of DNA replication e. both the dispersive and conservative models of DNA replication 22. In DNA replication: a. RNA primers are synthesized for both leading and lagging strands b. RNA primers are synthesized for leading strands only C. d. e. RNA primers are synthesized for lagging strands only DNA primers are synthesized for both leading and lagging strands DNA primers are synthesized for lagging strands only Page 5 of 20

Explanation / Answer

17- d , 18- b, 19- b , 20- e, 21- e, 22- a, 63- a, 66- e, 71- a, 72- c, 73-c , 74- e, 75- d, 76- e, 77- e, 78- e, 79- e, 81- a, 82- e , 83- b, 86- a

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