NEETZoologyMolecular Basis of Inheritance
Match List-I with List-II regarding the structural parameters of B-DNA and human genome lengths. List-I List-II A. Distance between consecutive base pairs I. 3.4 nm B. Pitch of B-DNA helix II. 0.34 nm C. Length of haploid human DNA III. 2.2 m D. Length of diploid human DNA IV. 1.1 m Choose the correct answer from the options given below:
Options
- AA-I, B-II, C-IV, D-III
- BA-II, B-I, C-IV, D-III
- CA-II, B-I, C-III, D-IV
- DA-I, B-II, C-III, D-IV
Correct answer
B. A-II, B-I, C-IV, D-III
Step-by-step solution
In a B-DNA double helix, the distance between two consecutive base pairs is 0.34 nm, while the pitch of the helix (one complete turn) is 3.4 nm. The length of DNA is calculated by multiplying the total number of base pairs by the distance between consecutive base pairs. For a haploid human genome ( 3.3 10^9 bp): Length = 3.3 10^9 0.34 10⁻⁹ m 1.1 m. For a diploid human genome ( 6.6 10^9 bp): Length = 6.6 10^9 0.34 10⁻⁹ m 2.2 m. Thus, the correct matching is A-II, B-I, C-IV, D-III. Answer: A-II, B-I, C-IV, D-III