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Question

The sequence of nitrogenous bases in one strand of DNA are 3TAC GCG ACG 5. The complementary DNA strand should have

A
5 AUG CGC TGC 3
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B
3ATG CGC TGC 5
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C
5UAC GCG ACG 3
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D
5ATG CGC TGC 3
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Solution

The correct option is C 5ATG CGC TGC 3
  • The two-strand of DNA is antiparallel to each other.
  • The four nitrogenous bases which form the backbone of the DNA pairs with the complementary base pairs like adenine pairs with thymine while the cytosine pairs with guanine.
  • So if the coding on the template strand is 3′TAC GCG ACG 5′ then its complementary strand will have 5′ATG CGC TGC 3′5′ATG CGC TGC 3′.
So, the correct answer is option D.

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