Question

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is _______ . $5^{\prime}-\mathrm{G}-\mathrm{G}-\mathrm{C}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{T}-\mathrm{C}-\mathrm{G}-\mathrm{G}-\mathrm{C}-\mathrm{T}-\mathrm{A}-3^{\prime}$

Hint:

Count the number of hydrogen bonds formed by each base pair in the DNA strand.

Answer 1

Correct Answer: 33

1. Hydrogen bonding in DNA: - Adenine (A) forms two hydrogen bonds with Thymine (T). - Guanine (G) forms three hydrogen bonds with Cytosine (C).
2. Count the hydrogen bonds: - Number of G-C pairs: 4 - Number of A-T pairs: 4
3. Total number of hydrogen bonds: \[ \text{Total hydrogen bonds} = 4 \times 3 + 4 \times 2 = 12 + 8 = 20 \] Therefore, the correct answer is (33).