Homework_6_01-21-09_C&A

Homework_6_01-21-09_C&A - Biology 5A Homework 6...

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Homework 6 January 21-23, 2009 1. The accompanying figure shows a trinucleotide. Which of the following statements about this trinucleotide is true? A. The trinucleotide is a DNA, and the left end is the 3' end. B. The trinucleotide is a DNA, and the left end is the 5' end. C. The trinucleotide is a RNA, and the left end is the 3' end. D. The trinucleotide is a RNA, and the left end is the 5' end. E. None of the statements is true. (Ans. D) 2. The accompanying sketch is meant to represent a DNA tetranucleotide in which phosphates are shown as circles, deoxyriboses are shown as pentagons, pyrimidines are shown as hexagons, and a purine is shown as a pentagon fused to a hexagon. Although the particular identities of the pyrimidines and purine are not specified, all but one of the following DNA tetranucleotides can be eliminated as candidates to form a double helix with the tetranucleotide shown in the sketch. Which of the following tetranucleotides might be able to form a double helix with the tetranucleotide shown in the sketch? A.
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Homework_6_01-21-09_C&A - Biology 5A Homework 6...

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