Question

a point mutation changes the dna sequence cga to cgt, but the same protein is still produced. which point mutation occurred?

nonsense
missense
silent
frameshift

Explanation:

A silent mutation is a type of point mutation where the DNA sequence changes, but the same protein is still produced. This is because the genetic code is degenerate, meaning that multiple codons can code for the same amino acid. In this case, the DNA sequence CGA is changed to CGT, but both codons code for the same amino acid (arginine), so the protein remains unchanged. A nonsense mutation results in a premature stop codon, a missense mutation results in a different amino acid, and a frameshift mutation shifts the reading frame of the genetic code.

Answer:

C. silent