250-exam3-answer-07-new

250-exam3-answer-07-new - Exam 3, BIL 250 / G October 22,...

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Exam 3, BIL 250 / G October 22, 2007 Answer Key for both forms Answer key is highlighted in bold . 1. If a mutation prevents the formation of the antiterminator 2 + 3 loop in the trp operon, what would be the effect? A. transcription only when tryptophan is absent B. transcription only when tryptophan is present C. constitutive attenuation of transcription D. constitutive transcription 2. Two formal terms used to describe categories of mutational nucleotide substitutions in DNA are called A. base analogues and frameshift. B. error prone and spontaneous. C. transversions and transitions. D. euchromatic and heterochromatic. E. sense and antisense. 3. A class of mutations which results in multiple contiguous amino acid changes in proteins is likely to be the following. A. base analogue. B. transversion. C. transition. D. frameshift. E. recombinant. 4. If a typical somatic cell has 32 chromosomes, how many chromosomes are expected in each gamete of that organism? A. 32 B. 64 C. 16 D. 0 E. 46 5. In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies? A. 200, 50 B. 100, 50 C. 200, 300
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D. 100, 100 E. 50, 50 6. What types of ratios for both genotypes and phenotypes are likely to occur in crosses when dealing with a single gene pair? A. 9:3:3:1, 1:2:1 B. 1:1:1:1, 1:4:6:4:1 C. 3:1, 1:1, 1:2:1 D. 9:7, 12:3:1 E. 15:1, 1:2 7. Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. What is the probability that their next child will be albino? A. ½ B. ¼ C. 100% D. 0 8. Restriction endonucleases are especially useful if they generate cohesive ends. What makes an end cohesive? A.
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250-exam3-answer-07-new - Exam 3, BIL 250 / G October 22,...

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