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DNA consists ...

Question

DNA consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is AGCTTCGA then the complementary sequence of the other chain will be

A

TCGAAGCT

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B

TCGTATCG

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C

AATTCCGG

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D

TCGAACTG

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Solution

The correct option is A
TCGAAGCT

Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C).
The given sequence is in the 5'-3' direction. The complementary sequence should also be given in the 5'-3' direction. So, we should read the given sequence backward and write the sequence of the complementary bases.
Therefore, TCGAAGCT is the sequence complementary to AGCTTCGA.

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