Q178 / 180 · NEET 2020 (Phase 1) · Zoology

The specific palindromic sequence which is recognized by EcoRl is

  • A
    5' - GGAACC - 3'
    3' - CCTTGG - 5'
  • B
    5' - CTTAAG - 3'
    3' - GAATTC - 5'
  • C
    5' - GGATCC - 3'
    3' - CCTAGG - 5'
  • Correct answer
    D
    5' - GAATTC - 3'
    3' - CTTAAG - 5'

Solution

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. These sequences may range from 4-8 nucleotides in length. For example, the restriction site for EcoRI is between G and A residues in the palindromic sequence given below.

          ↓5'- GAATTC -3'3'- CTTAAG -5'                     ↑

Hence, the correct answer is option: 'D'.

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