FinalExamMCv1

FinalExamMCv1 - Name MULTIPLE CHOICE Choose the one...

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Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following statements best describes a biochemical reaction that has reached equilibrium? A) The concentration of products equals the concentration of reactants. B) The rate of the forward reaction equals the rate of the reverse reaction. C) Both forward and reverse reactions have halted. D) The reaction is now irreversible. E) No reactants remain. Answer: B 2) You are carrying out DNA replication in a test tube and you have added all the necessary enzymes and reactants to the mixture. When you check the products you find that about half of the new nucleic acid is in the form of the long strands you expected, but the other half is composed of short segments. Analysis shows that those segments are composed of DNA. The first thing you would check to fix this problem is A) whether the DNA polymerase I is functioning properly B) whether the DNA polymerase II is functioning properly C) whether the primase is functioning properly D) whether the DNA polymerase III is functioning properly E) whether the ligase is functioning properly Answer: E 3) Crossing over usually contributes to genetic variation by exchanging chromosomal segments between 1
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4) Muscle cells differ from nerve cells primarily because A) they have different chromosomes. B) they contain different genes. C) they use different genetic codes. D) they express different genes. E) they have different ribosomes. Answer: D 5) Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join the nucelotides together. What effect would these enzymes have on DNA molecules? A) The two strands of the double helix would separate. B) The phosphodiester bonds between the deoxyribose sugars would be broken. C) The purines would be separated from the deoxyribose sugars. D) The pyrimidines would be separated from the deoxyribose sugars. E) All bases would be separated from the deoxyribose sugars. Answer: B
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