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Question

Given below is a short sequence of DNA describing the base pairs on each strand of DNA. What is so special about it?
5’___ GAATTC ___ 3’
3’ ___ CTTAAG ___ 5’

A
Replication completed
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B
Deletion mutation
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C
Start codon at the 5’ end
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D
Palindromic sequence of base pairs
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Solution

The correct option is D Palindromic sequence of base pairs
The palindromes in DNA are base pair sequences that are the same when read forward (left to right) or backward (right to left) from a central axis of symmetry. The given sequences read the same in the 53 direction and in the 35 direction. Palindromic sequences are the recognition sites of a special type of enzymes called restriction endonucleases that cleave the DNA strand at that specific portion.

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