A segment of DNA has 100 adenine and 150 cytosine bases. What is the total number of nucleotides present in this segment of DNA?

Question 25:A segment of DNA has 100 adenine and 150 cytosine bases. What is the total number of nucleotides present in this segment of DNA?

The correct answer is – In DNA, adenine always pairs with thymine, and cytosine always pairs with guanine. Therefore, if a segment of DNA has 100 adenine bases, it must also have 100 thymine bases, since the number of adenine bases will always be equal to the number of thymine bases. Similarly, if the segment has 150 cytosine bases, it must also have 150 guanine bases. Therefore, the total number of nucleotides present in the segment can be calculated as follows: Total number of nucleotides = Number of adenine + Number of thymine + Number of cytosine + Number of guanine Total number of nucleotides = 100 + 100 + 150 + 150 Total number of nucleotides = 500 Therefore, the segment of DNA contains 500 nucleotides.