OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a strand of DNA is unfolded, the bases on one side read as follows:5’-TCAG-3’ What will the complimentary strand read?
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5’-AGUC-3’
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5’-AGTC-3’
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3’-AGUC-5’
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3’-AGTC-5’
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Explanation:
Detailed explanation-1: -For the given sequence, the complementary strand will be 3’-TACGTACGTACGTACGTACGTACGTACG − 5’. So, the sequence of the complimentary strand in 5’ to 3’ direction is 5’-GCATGCATGCATGCATGCATGCATGCAT− 3’. Was this answer helpful?
Detailed explanation-2: -DNA is always synthesized in the 5’-to-3’ direction, meaning that nucleotides are added only to the 3’ end of the growing strand. As shown in Figure 2, the 5’-phosphate group of the new nucleotide binds to the 3’-OH group of the last nucleotide of the growing strand.
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