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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 pairs

Correct answer: Palindromic sequence of base pairs

Solution

This DNA segment is special because the sequence is the same on both strands when each is read in the 5' to 3' direction. Such sequences are called palindromic base-pair sequences and are often recognized by restriction enzymes.

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