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Question 21

A revision card on DNA structure and base pairing lists the DNA bases as A, U, C and G. Which correction does the card need?

  1. Replace U with TCorrect answer
  2. Replace C with T
  3. Add T so that five bases are listed
  4. No correction is needed

Explanation

The letter U does not belong in DNA at all, and the base it has pushed off the list is T. Adding T while keeping U would leave five bases on the card, whereas DNA works with four of them, arranged as two fixed couples.

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Question 21: A revision card on DNA structure and base pairing lists the… · Genetics Basics · Questena