Which of the following is NOT one of the three types of point mutations?

Translocation is indeed not one of the three types of point mutations. Point mutations involve changes in a single nucleotide base pair in the DNA sequence and can be categorized into three main types: silent, nonsense, and missense mutations.

Silent mutations do not alter the amino acid sequence of a protein, even though a nucleotide change has occurred. This happens because of the redundancy in the genetic code; multiple codons can encode the same amino acid.

Nonsense mutations result in the creation of a premature stop codon in the protein-coding sequence, leading to a truncated and often nonfunctional protein. This type of mutation has a significant impact on protein function because it can lead to the loss of essential parts of the protein.

Missense mutations, on the other hand, change one amino acid in the protein sequence, which may alter the function or stability of the resulting protein depending on the nature of the amino acid substitution.

Translocation, however, refers to a chromosome rearrangement whereby a segment of one chromosome is transferred to another chromosome. This is a larger-scale genetic alteration involving multiple nucleotides and does not fall under the definition of point mutations, which are specifically about single nucleotide changes.