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SAT Biology (Molecular) → Sample test questions from 31 to 40

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31. One would expect to find reverse transcriptase in
(A) the plasmids of competent cells
(B) retrovisuses
(C) purple sulfur bacteria
(D) plasmodia
(E) archaebacteria

32. The target tissue for parathyroid hormone is (are) the
(A) kidneys
(B) bones
(C) small intestine
(D) all of the above
(E) none of the above

33. The products of oxidative phosphorylation are
(A) oxygen and water
(B) NADH and ATP
(C) water and ATP
(D) pyruvate and NADPH
(E) oxygen and NADH

34. A major difference between gram positive and gram negative bacteria is that the former has
(A) a liposaccharide outer covering with a small peptidoglycan component in the cell wall
(B) a small peptidoglycan component covering a large liposaccharide base
(C) a large peptidoglycan component in the cell wall
(D) a cell wall composed of liposaccharide and chitin
(E) a cell wall composed of chitin over peptidoglycan

35. Let X represent an atom and X* its radioactive isotope. Assume both are taken up by living organisms. If the half-life of X* is 4,000 years, how much X* will be present in the remains of an organism that is 16,000 years old
(A) as much as a living organism
(B) 4 times as much
(C) one-fourth as much
(D) one-sixteenth
(E) indeterminate given the lack of climatic data

36. All of our cells contain protooncogenes that may turn into oncogenes, which are cancer genes. The best explanation for protooncogenes is that they
(A) came into our cells from a viral infection of our ancestors
(B) arose from plasmids that have been inserted into bacteria and now reside in us
(C) are DNA “junk” with no known function
(D) turn into oncogenes as we age
(E) help regulate cell division

37. In genetic engineering, it is necessary to cut DNA out of bacteria and eukaryotes. To insert the human insulin gene into a bacteria, one should use
(A) two different restriction enzymes so that the pieces would not reanneal
(B) the same restriction enzyme so that both pieces will have the same sticky ends
(C) methylated bacterial DNA so that only some of it will be spliced
(D) two different ligases to reanneal the DNA
(E) a hot water bath at 55 degrees centigrade so that the reaction will happen faster

38. Watson and Crick used all of the following information in elucidating the physical structure of DNA EXCEPT
(A) the Meselson-Stahl experiment
(B) X-ray crystallography
(C) Chargoff’s rules
(D) the different sizes of purines and pyrimidines
(E) the transforming principle of Avery et al

39. Which of the following organelles is out of order from an endomembrane point of view?
(A) nucleus
(B) vesicles
(C) golgi apparatus
(D) endoplasmic reticulum
(E) plasma membrane

40. The products of the light reactions, or photophosphorylation, in photosynthesis are
(A) oxygen and water
(B) oxygen and ATP
(C) oxygen, ATP, and NADPH
(D) water, ATP, and NADPH
(E) water, ATP

ANSWERS: SAT BIOLOGY E/M (MOLECULAR) SAMPLE TEST
31. B
32. D
33. C
34. C
35. D
36. E
37. B
38. A
39. D
40. C