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  • BMAT 2020 Section 2 Q25

  • Nicolas Sanchez

    June 26, 2021 at 9:02 am
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    The diagram shows part of a DNA double helix being copied.

    [see diagram below]

    Which of the following statements, considered independently, is/are correct?

    1 The probability of any base in strand 2 being guanine (G) is 0.17.
    2 If p is guanine and r cytosine, a mutation must have taken place.
    3 The copying process shown is taking place during mitosis.

    A. none of them
    B. 1 only
    C. 2 only
    D. 3 only
    E. 1 and 2 only
    F. 1 and 3 only
    G. 2 and 3 only
    H. 1, 2 and 3

  • Paris Pitsinikos

    July 21, 2021 at 6:48 pm
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    Down Accepted answer

    1. Since the percentage of guanine in strand 1 is 25% then the percentage of C in strand 2 will be 25% as well.

    2. This is correct since if p is guanine then it would be paired with Cytosine. But if r is cytosine then it’s pair is guanine and the explanation could be a mutation taking place. This is correct.

    3. The DNA replication occurs before mitosis begins. This is false.

    The answer is E.

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