Question

In a segment of DNA with 120 adenine and 120 cytosine, the total number of nucleotides in that segment would be

• A. 280
• B. 480
• C. 640
• D. 240

Answer 1

Answer: (B)

480

DNA is composed of nucleotides, phosphate and ribose sugar. It has adenine, cytosine, thymine and guanine. No. of adenine is same as that of thymine and no. of guanine is same as that of cytosine. So A = T and G = C. So the total no. of nucleotides in segment is 120+120+120+120 = 480.

So the correct answer is '480'.