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NEET2013ZoologyBiotechnology - Principles and ProcessesActual

Which of the following is a palindromic sequence?

Options

  1. Aaligned & 5^ - CGTATG - 3' & 3^ - GCATAC - 5' aligned
  2. Baligned & 5^ -C G A A T G-3^ & 3^ -C G A A T G-5^ aligned
  3. Caligned & 5^ - GAATTC - 3' & 3^ - CTTAAG - 5' aligned
  4. Daligned & 5^ - GACTAC -3^ & 3^ - TACGAC -5^ aligned

Correct answer

C. aligned & 5^ - GAATTC - 3' & 3^ - CTTAAG - 5' aligned

Step-by-step solution

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 following sequence reads the same on the two strands in 5^ 3^ direction. This is also true when we read in the 3^ 5^ direction. Restriction endonuclease enzymes recognize palindromic sequences in DNA and cut them.

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