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Question

Which one of the following represents a palindromic sequence in DNA?

A
5'- GAATTC-3'
3'-CTTAAG-5'
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B
5' - CCAATG - 3'
3' - CAATCC - 5'
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C
5' -CATTAG-3'
3'-GATAAC-5'
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D
5' - GATACC - 3'
3' - CCTAAG - 5'
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Solution

The correct option is A 5'- GAATTC-3'
3'-CTTAAG-5'
A palindromic sequence is a sequence of nucleic acids that is the same when read from 5' to 3' on one strand and 5' to 3' on the other complementary strand.
5' - GAATTC-3' and 3' - CTTAAG-5' sequences read the same on the two strand in 5'3' direction. This is also true in the 3'5' direction. Hence, it is a palindromic sequence in DNA.

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