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JAMB Biology 2012 Question 43

Question 43

Chromosomes, DNA and Sex Linkage

The correct base pairing for DNA is

  1. A.adenine → thymine and guanine → cytosine
  2. B.adenine → guanine and thymine → cytosine
  3. C.adenine → cytosine and guanine → thymine
  4. D.adenine → adenine and cytosine → cytosine
Show the answer and explanation

Answer: A (adenine → thymine and guanine → cytosine)

Explanation

In DNA, adenine always pairs with thymine and guanine always pairs with cytosine.