A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

Question

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

(a)120

(b) 240

(c) 60

(d) 480

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct option (d)480

Explanation :

According to Chargaff's ruIe, molar amount of adenine is equal to that of thymine and cytosine equals to guanine, A + G = T + C. So, a segment of DNA with 120 adenine base and 120 cytosine base will have same number of each thymine and guanine base (as, A = T and C = G), i.e. 120 thymine bases, 120 guanine bases, thus a total of 480 nucleotides.