NEET Botany Molecular Basis of Inheritance Questions Solved


In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases?

(1) 780

(2) 1560

(3) 740

(4) 1480

(1) Total DNA = 3.2 Kbp = 3200 bp

Adenine = 820

According to Chargaff's rule

[A] = [T], [G] = C]

So, Thymine = 820

Therefore, total A + T content = 820 + 820 = 1640

Also, A + T = 3200 – (G + C)

So, G + C content = 3200 – 1640 = 1560

So, cytosine15602=780

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