exam 3 - Copyright 2006 Texas A&M University Sample...

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© Copyright 2006 Texas A&M University Sample Exam 3 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The strands that make up DNA are antiparallel. This means that 1) _______ A) one strand is positively charged and the other is negatively charged. B) base pairings create unequal spacing between the two DNA strands. C) the 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. D) the twisting nature of DNA creates nonparallel strands. E) one strand contains only purines and the other contains only pyrimidines. 2) What are ribosomes composed of? 2) _______ A) proteins only B) mRNA, tRNA, rRNA, and protein C) mRNA, rRNA, and protein D) rRNA only E) both rRNA and protein 3) What is the function of reverse transcriptase in retroviruses? 3) _______ A) It converts host cell RNA into viral DNA. B) It uses viral RNA as a template for making complementary RNA strands. C) It uses viral RNA as a template for DNA synthesis. D) It hydrolyzes the host cell's DNA. E) It translates viral RNA into proteins. 4) Males are more often affected by sex-linked traits than females because 4) _______ A) female hormones such as estrogen often compensate for the effects of mutations on the X. B) males males only have one X chromosome. C) X chromosomes in males generally have more mutations than X chromosomes in females. D) male hormones such as testosterone often exacerbate the effects of mutations on the X chromosome. E) mutations on the Y chromosome often exacerbate the effects of X-linked mutations. 5) What are prions? 5) _______ A) tiny molecules of RNA that infect plants B) viral DNA that has had to attach itself to the host genome C) a mobile segment of DNA D) viruses that invade bacteria E) misfolded versions of normal brain protein 6) What is an anticodon part of? 6) _______ A) tRNA B) mRNA C) DNA D) a ribosome E) an activating enzyme
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© Copyright 2006 Texas A&M University 7) A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of a phenylalanine. The consequence of this for the cell will be that 7) _______ A) proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU. B) the cell will compensate for the defect by attaching phenylalanine to tRNAs with lysine-specifying anticodons. C) none of the proteins in the cell will contain phenylalanine. D) the ribosome will skip a codon every time a UUU is encountered. E) None of the above will occur; the cell will recognize the error and destroy the tRNA. 8) Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents? 8) _______ A) X CXC and X CY B) X cXc and X CY C) X CXc and X CY D) X cXc and X cY E) X CXC and X cY Refer to the following to answer the questions below.
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exam 3 - Copyright 2006 Texas A&M University Sample...

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