Question

which of the following is a cause of a dna mutation?
a. the linking of amino acid subunits into a long chain
b. the diffusion of molecules across the cell membrane
c. the transcription of dna into rna
d. an error in the repair of damaged dna

Explanation:

DNA mutations can occur due to errors in DNA repair mechanisms. When DNA is damaged, cells have repair systems to fix it. If these systems make mistakes during repair, it can lead to changes in the DNA sequence, which are mutations. Linking amino - acids forms proteins, molecule diffusion across the cell membrane is related to transport processes, and DNA transcription into RNA is part of gene expression and not a direct cause of DNA mutations.

Answer:

D. An error in the repair of damaged DNA