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Question 22

A sample of double-stranded DNA contains 300 A bases. What else must be true of the sample?

  1. It contains 300 T basesCorrect answer
  2. It contains 300 C bases
  3. It contains 600 T bases
  4. It contains 300 of each of the four bases

Explanation

Every A on one strand is held opposite a T on the other, so those two counts have to match exactly. It does not follow that C and G appear the same number of times as A, because the two couples are counted separately and a molecule can be rich in one couple and poor in the other.

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Question 22: A sample of double-stranded DNA contains 300 A bases. What… · Genetics Basics · Questena