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SAT Biology (Molecular) → SAT Biology (Molecular) practice test paper questions from 51 to 60
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51. Which of the following base substitution mutations in the mRNA above would have the least effect on the resulting polypeptide?
(A) substitution of UCC for UUC in Phe
(B) substitution of CAA for CCA in Pro
(C) substitution of CAC for CAG in Gln
(D) substitution of GGA for GGU in Gly
(E) both a and c
52. The pattern of DNA fragments resulting from restriction enzyme digestion of genomic DNA from two species of skunk with EcoRI show extensive similarities. This suggests that
(A) most of the restrictions sites recognized by EcoRI are found at approximately the same distances apart in the DNA from both skunk species
(B) the two skunks must be the same species, not different species
(C) restriction enzyme digestion with EcoRI produces the same pattern of DNA fragments in all organisms
(D) the genetic makeup of the two skunk species is identical
(E) both b and d
53. Restriction enzyme digestion with HindIII of genomic DNA from three toad species (A, B, and C) revealed that species A and B each produced unique fragment patterns, whereas species C shared fragments with both species A and species B. These results suggest that
(A) species C is a hybrid between species A and species B
(B) the DNA sample from species C must have been contaminated
(C) species C is the most recent living ancestor of both species A and species B
(D) species C served as an outgroup for the study
(E) both a and c
54. One of the earliest theories pertaining to the origin of life on earth suggested that life began in shallow pools. Recent studies have led to extensive debate regarding the origin of life, with some researchers suggesting that life may have originated
(A) as viral particles
(B) in volcanoes
(C) in mudflats
(D) from naked strands of RNA
(E) near deep sea vents
55. The number of base pairs in a typical bacterium is about __________, while the number in human cells is around __________.
(A) 3,000, 3 million
(B) 1 million, 1 billion
(C) 3 million, 3 billion
(D) 1 billion, 12 trillion
(E) 2 million,3 billion
56. The proteins around which human DNA is wound are
(A) cyclins
(B) heat shock proteins
(C) G-proteins
(D) methylated protein
(E) histones
57. The proteins that come together to form “maturation promoting factors,” or “M phase factors,” are
(A) cyclins and cyclin-dependent kinases
(B) cyclin-dependent kinases and G proteins
(C) cyclins
(D) G-proteins
(E) sulphur containing proteins
58. Restriction enzymes were originally isolated from
(A) viruses, which use them to cut bacterial DNA
(B) bacteria, which use them to cut viral DNA
(C) viruses, which use them to turn off their host bacterial DNA
(D) protists, which use them to organize themselves into colonial life-forms
(E) both a and d
59. If a restriction enzyme has as its recognition sequence “ATCCTA,” how many restriction sites would appear in the lambda genome, which is approximately 54,000 bp?
(A) 2,250
(B) 9000
(C) 13
(D) 7
(E) 9
60. Which enzyme(s) should be used to insert the human sequence into the plasmid?
(A) ERA I
(B) CRO I
(C) MEM II
(D) CRO I and ERA I
(E) both a and b
ANSWERS: SAT BIOLOGY PRACTICE PAPER
51. D
52. A
53. A
54. E
55. C
56. E
57. A
58. B
59. C
60. A