Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it? 5'_ GAATTC' _ 3', 3'_ CTTAAG _ 5'
Correct answer: D. Palindromic sequence of base pairs
- A. Replication completed
- B. Deletion mutation
- C. Start codon at the 5' end
- D. Palindromic sequence of base pairs
Explanation
Palindromes are groups of letters that form the same words when read both forward and backward, e.g., "MALAYALAM". As against a word palindrome where the same word is read in both directions, the palindrome in DNA is a sequence of base pairs that reads the same on the two strands when the orientation of reading is kept the same. For example, the following sequences read the same on the two strands in 5' -- 3' direction. This is also true if read in the 3' -- 5' direction. In this case, it is 5' - GAATTC - 3', 3' - CTTAAG - 5'.
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