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SAT Biology (Molecular) → SAT Biology (Molecular) practice test paper questions from 71 to 80

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71. Which of the following substances would NOT be present in a typical procedure for separating proteins by gel electrophoresis?
(A) water
(B) bromophenol blue
(C) Tris buffer
(D) agarose
(E) polyacrylamide

72. You are trying to measure mRNA synthesis with animal cells growing in a tissue culture. Which radioactive nucleotide should you provide to the cells to measure RNA synthesis?
(A) adenine
(B) cytosine
(C) guanine
(D) thymine
(E) uracil

73. Splicing of hnRNA is done in the nucleus by “snurps.” Of what are these “snurps” composed?
(A) RNA
(B) DNA
(C) proteins
(D) RNA and proteins
(E) DNA and proteins

74. Peter Mitchell was able to demonstrate chemiosmosis by getting ______________ to go down their concentration gradient by using two different ___________.
(A) potassium ions, light frequencies
(B) hydrogen ions, light frequencies
(C) potassium ions, pH solutions
(D) hydrogen ions, pH solutions
(E) potassium ions, electromagnetic frequencies

75. Blood entering the dorsal aorta has most recently been in the
(A) right atria
(B) right ventricle
(C) left ventricle
(D) left atria
(E) pulmonary vein

76. Carbon dioxide that is leaving the body is carried in
I. the plasma
II. erythrocytes
III. hemoglobin molecules
(A) I only
(B) II only
(C) III only
(D) I and II
(E) I, II, and III

77. Carbohydrate digestion begins in the __________ with the action of the enzyme __________.
(A) mouth, amylase
(B) stomach, pepsin
(C) stomach, chymotrypsin
(D) small intestine, amylase
(E) small intestine, cholecystokinin (CCK)

78. The function of ATP in voluntary muscle movement is to supply the energy for
(A) myosin to bind to actin
(B) myosin to become separated from actin
(C) tropomyosin to bind to troponin
(D) tropomyosin to become separated from troponin
(E) tropomyosin to become separated from actin

79. Curare acts on the same receptors as acetylcholine but does not cause the effect of acetylcholine, nor is it easily decomposed or cleaved by cholinesterases. Injection of curare into a person could result in
I. epileptic seizures
II. muscle relaxation
III. suffocation
(A) I only
(B) II only
(C) III only
(D) I and II
(E) II and III

80. The undershoot during an action potential is the result of
(A) the sodium gates being closed and the potassium gate open
(B) the sodium gates being closed and the potassium gate closed
(C) the sodium gates being open and the potassium gate closed
(D) the sodium gates being open and the potassium gate open
(E) one of the sodium gates being open, one closed, and the potassium gate open

ANSWERS: SAT BIOLOGY (MOLECULAR) PRACTICE TEST
71. D
72. E
73. D
74. D
75. C
76. E
77. A
78. B
79. E
80. A