Mutations are only
A) changes in the nucleotide sequence of DNA.
B) changes in the amino acid sequence of proteins.
C) changes in the nucleotide sequence of RNA.
D) caused by mistakes in DNA replication.
E) caused by environmental agents.

Question

Quizplus · Accepted Answer

Mutations are defined as changes in the nucleotide sequence of DNA. They occur as a result of errors during DNA replication, exposure to environmental agents such as radiation and chemicals, or spontaneously. Mutations can have varying effects, from no impact on the organism to significant changes in the phenotype, including disease. Changes in the amino acid sequence of proteins are a consequence of mutations in the DNA sequence because the genetic code is translated from DNA to RNA to proteins. However, not all mutations affect the amino acid sequence, such as silent mutations that do not lead to changes in the protein. Changes in the nucleotide sequence of RNA can occur as well, but they are not considered mutations unless they affect the phenotype.

Mutations Are Only