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NEET 2022
Exam
NEET
Year
2022
Subject
Zoology
Chapter
Molecular Basis of Inheritance

NEET 2022 · Zoology · Molecular Basis of Inheritance

If the length of a DNA molecule is 1 . 1 metres, what will be the...

If the length of a DNA molecule is 1.11 . 1 metres, what will be the approximate number of base pairs?

Options

  1. A6.6×109bp6 . 6 \times {10}^{9}bp
  2. B3.3×106bp3 . 3 \times {10}^{6}bp
  3. C6.6×106bp6 . 6 \times {10}^{6}bp
  4. D3.3×109bp3 . 3 \times {10}^{9}bp

Correct answer

D. 3.3×109bp3 . 3 \times {10}^{9}bp

Step-by-step solution

The two chains of DNA are coiled in a right-handed helicle fashion. The pitch of the helix is 3.43 . 4nm and has a diameter of 22 nm. In the B-form of DNA, the distance between a bp in a helix is approximately 0.340 . 34nm which means there are about 1010 nucleotides present in a complete turn.

The total length of DNA molecule in nm = 1.1×1091 . 1 \times {10}^{9} nm.

The approximate number of base pairs = =1.1×1090.34=3.3×109\dfrac{= 1 . 1 \times {10}^{9}}{0 . 34} = 3 . 3 \times {10}^{9}

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