OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If a strand reads:3’ A A A T T T C 5’The matching strand would read ____
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5’ T T T A A A G 3’
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3’ T T T A A A G 5’
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5’ A A A T T T C 3’
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3’ U U U A A A G 5’
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Explanation:
Detailed explanation-1: -A DNA double helix is always anti-parallel; in other words, one strand runs in the 5’ to 3’ direction, while the other runs in the 3’ to 5’ direction.
Detailed explanation-2: -The RNA pol “walks” along the DNA molecule reading each base, finding the complementary RNA nucleotide, and adding it to the growing RNA strand. The RNA is ALWAYS built in the 5’ to 3’ direction, so it ALWAYS reads the template strand in the 3’ to 5’ direction.
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