What is the main difference between synonymous and nonsynonymous mutations?

What is the main difference between synonymous and nonsynonymous mutations?

• A. Both change the protein's amino acid sequence
• B. Only nonsynonymous mutations result in altered amino acids
• C. Synonymous mutations change the protein structure significantly
• D. Both types lead to the same amino acid sequence

Answer: (B)

The main difference between synonymous and nonsynonymous mutations lies in their effects on the protein's amino acid sequence. Nonsynonymous mutations are changes in the DNA sequence that lead to a different amino acid being incorporated into the protein product. This alteration can affect the structure and function of the protein, potentially giving it new or different properties. In contrast, synonymous mutations do not change the amino acid sequence; they modify the nucleotides in a way that still codes for the same amino acid due to the redundancy in the genetic code. Because of this redundancy, synonymous mutations are often referred to as "silent" mutations because they do not affect the resultant protein. Thus, the distinction is clear: nonsynonymous mutations result in altered amino acids, which can significantly impact protein formation and function, while synonymous mutations do not affect the resulting amino acid sequence or the protein itself.

The main difference between synonymous and nonsynonymous mutations lies in their effects on the protein's amino acid sequence. Nonsynonymous mutations are changes in the DNA sequence that lead to a different amino acid being incorporated into the protein product. This alteration can affect the structure and function of the protein, potentially giving it new or different properties.

In contrast, synonymous mutations do not change the amino acid sequence; they modify the nucleotides in a way that still codes for the same amino acid due to the redundancy in the genetic code. Because of this redundancy, synonymous mutations are often referred to as "silent" mutations because they do not affect the resultant protein.

Thus, the distinction is clear: nonsynonymous mutations result in altered amino acids, which can significantly impact protein formation and function, while synonymous mutations do not affect the resulting amino acid sequence or the protein itself.