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AIIMS 2013
Exam
AIIMS
Year
2013
Subject
Zoology
Chapter
Biotechnology - Principles and Processes

AIIMS 2013 · Zoology · Biotechnology - Principles and Processes

Which of the following is a palindromic sequence?

Which of the following is a palindromic sequence?Which of the following is a palindromic sequence?

Options

  1. A5′ - CGTATG - 3’ 3′− GCATAC - 5’ \begin{aligned} & 5^{\prime} \text{ - CGTATG - 3' } \\ & 3^{\prime}-\text{ GCATAC - 5' }\end{aligned}
  2. B5′−CGAATG−3′3′−CGAATG−5′\begin{aligned} & 5^{\prime}-C G A A T G-3^{\prime} \\ & 3^{\prime}-C G A A T G-5^{\prime}\end{aligned}
  3. C5′ - GAATTC - 3’ 3′ - CTTAAG - 5’ \begin{aligned} & 5^{\prime} \text{ - GAATTC - 3' } \\ & 3^{\prime} \text{ - CTTAAG - 5' }\end{aligned}
  4. D5′−GACTAC−3′3′−TACGAC−5′\begin{aligned} & 5^{\prime}-\mathrm{GACTAC}-3^{\prime} \\ & 3^{\prime}-\mathrm{TACGAC}-5^{\prime}\end{aligned}

Correct answer

C. 5′ - GAATTC - 3’ 3′ - CTTAAG - 5’ \begin{aligned} & 5^{\prime} \text{ - GAATTC - 3' } \\ & 3^{\prime} \text{ - CTTAAG - 5' }\end{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′5^{\prime} \rightarrow 3^{\prime} direction. This is also true when we read in the 3′→5′3^{\prime} \rightarrow 5^{\prime} direction. Which of the following is a palindromic sequence?
Restriction endonuclease enzymes recognize palindromic sequences in DNA and cut them.
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