NEET 2011 Biology question

Given below is a sample of a portion of DNA strand. What is so special shown in it

5' GAATTC 3'

3' CTTAAG 5'

(1)Replication completed
(2)Deletion mutation
(3)Start codon at the 5' end
(4)Palindromic sequence of base pairsCorrect

Answer: (4)

Solution

A palindromic sequence in DNA is one in which the base sequence reads the same in the 5'3' direction on both strands. Here the top strand is 5'-GAATTC-3' and the bottom strand, read 5'3', is also GAATTC.

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Question ID VK-090832