Multiple choice

The process by which extra nucleotides are added into the DNA molecule is known as

  1. point mutation

  2. insertions

  3. deletions

  4. amplifications
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Insertions add one or more extra nucleotides into the DNA. They are usually caused by transposable elements, or errors during replication of repeating elements, e.g. AT repeats. Insertions in the coding region of a gene may alter splicing of the mRNA (splice site mutation), or cause a shift in the reading frame (frameshift), both of which can significantly alter the gene product.

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