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16 September, 15:41

If a base-pair change occurs during DNA replication, this

is a mutation.

would be a mutation only if it falls in a protein-coding part of a gene.

would be a mutation only if it falls in a transcribed part of the genome.

is not a mutation, because only one base pair has been altered.

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  1. 16 September, 16:10
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    Correct Answer: "is a mutation"

    This is the best answer choice because a mutation when at least one base pair changes to another.

    Incorrect Answers:

    "would be a mutation only if it falls in a protein-coding part of a gene"

    Some mutations are more influential than others. If this mutation occurred in a region that codes for a protein, then it could greatly influence the structure/function of the the protein and therefore the cellular processes that the protein is used for. Oppositely, mutations can occur in regions that don't code directly for a protein and therefore could go completely unnoticed, making this a bad answer choice.

    "would be a mutation only if it falls in a transcribed part of the genome."

    A mutation can occur when the gene in transcribed from DNA → RNA, but the process of transcription is separate from that of DNA replication so that makes this answer choice not so good.

    "is not a mutation, because only one base pair has been altered."

    A mutation can be just when one base pair is altered, so this is an incorrect statement.
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