Which statement is correct?
A) All cells from a single complex organism express the same genes.
B) Mutations are always caused by chemicals or radiation.
C) Mutations can occur spontaneously.
D) Most mutations are harmful, so evolution proceeds more rapidly when no mutations occur.
E) Mutations affect proteins but not the DNA.

Question

Quizplus · Accepted Answer

Mutations can occur spontaneously due to errors in DNA replication or environmental factors, such as UV radiation. It is not always caused by chemicals or radiation, and not all mutations are harmful. Additionally, while some mutations can affect the protein produced by a gene, they always involve changes to the DNA sequence. Therefore, choice C is the only correct statement.

Which Statement Is Correct