Question

If the cystine content of double stranded DNA is 20 percent of the total bases then the adenine content will be

• A. 40 percent
• B. 30 percent
• C. 20 percent
• D. 10 percent

Hint:

In double-stranded DNA the amount of adenine is always equal to thymine and the amount of guanine equals cystine due to base pairing rules

Answer 1

The Correct Option is D

If cystine is 20 percent guanine will also be 20 percent due to base pairing leaving 60 percent for adenine and thymine Since adenine pairs with thymine in equal amounts the adenine content will be 10 percent