Question

The following ratio is generally constant for a given species :-

• A. T + C / G + A
• B. G + C / A+ T
• C. A + C / T + G
• D. A + G / C +T

Answer 1

The correct option is B G + C / A+ T

The ratio of the sum of the adenine plus thymine bases to the sum of the guanine plus cytosine bases in a DNA molecule is called as G + C / A + T ratio. Generally, G + C / A + T ratio is constant for a given species. This ratio differs from species to species. However, it is constant for a given species. Species living in high temperature have high G + C / A + T ratio as it gives stability due to triple hydrogen bond between Guanine and Cytosine.

Thus, the correct answer is 'G + C / A+ T.'