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Beating the MCAT: A Question at a Time
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"Success is the sum of small efforts, repeated day in and day out."
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Which of the following best describes how tRNA differs from mRNA?
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A
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Transfer RNA uses adenine, guanine, uracil, and cytosine while messenger RNA uses adenine, guanine, thymine, and cytosine.
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B
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Transfer RNA uses adenine, guanine, thymine, and cytosine while messenger RNA uses adenine, guanine, uracil, and cytosine.
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C
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Transfer RNA has a complex loop structure while messenger RNA is usually a simple, linear strand.
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D
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In transfer RNA, anticodons are complementary to messenger RNA codons, while in messenger RNA, codons are anti-complementary to DNA triplets.
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Scroll down to see the answer explanation
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Cindy Liu
Stanford University
132 - 100th Percnetile
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"I'm still in shock at my score...I started off with CARS being my worst section, but gradually improved and gained so much confidence through the
bootcamp. Testing Solutions was the biggest factor in my CARS score."
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You already have the
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Which of the following best describes how tRNA differs from mRNA?
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A
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Transfer RNA uses adenine, guanine, uracil, and cytosine while messenger RNA uses adenine, guanine, thymine, and cytosine.
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B
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Transfer RNA uses adenine, guanine, thymine, and cytosine while messenger RNA uses adenine, guanine, uracil, and cytosine.
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C
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Transfer RNA has a complex loop structure while messenger RNA is usually a simple, linear strand.
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D
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In transfer RNA, anticodons are complementary to messenger RNA codons, while in messenger RNA, codons are anti-complementary to DNA triplets.
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(A) and (B) are incorrect because both transfer RNA and messenger RNA use the same four nitrogenous bases (adenine, guanine, uracil, and cytosine). (D) is incorrect because in transfer
RNA, anticodons are complementary to messenger RNA codons, while in messenger RNA, codons are complementary to DNA triplets. (C) is correct because messenger RNA primarily has a linear conformation (which is conducive to translation by ribosomes) while transfer
RNA primarily has a complex tertiary structure.
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