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15 May, 12:06

Which of the following statements about the functional consequences of single base-pair mutations are TRUE? Select the three correct answers. A) Mutations that occur in the intron sequences cannot affect the protein coding sequence of a gene. B) Insertions or deletions of single base-pairs within a protein coding sequence probably change the amino acid sequence encoded by a gene. C) Nucleotide substitutions within a coding sequences always change the amino acid sequence encoded by a gene. D) Missense mutations always change the amino acid sequence encoded by a gene. E) Nucleotide substitutions outside of the coding sequence can affect the expression of a gene.

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  1. 15 May, 12:27
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    these statements are true

    B) Insertions or deletions of single base-pairs within a protein coding sequence probably change the amino acid sequence

    D) Missense mutations always change the amino acid sequence encoded by a gene

    E) Nucleotide substitutions outside of the coding sequence can affect the expression of a gene.

    Explanation:

    B) insertion or deletion of nucleotide in coding region of DNA can change the amino acid sequence encoded.

    D) missense mutation means that the change in nucleotide sequence resulting in change in amino acid sequence encoded by gene.

    E) A mutation may alter the promoter of a gene, thereby affecting the rate of transcription.
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