Question

question 5 of 10
how are mutations prevented during dna replication?
a. sister chromatids check the order of the bases.
b. trna molecules check the amino acids for errors.
c. three extra copies of all chromosomes are made.
d. dna polymerase checks dna for errors.

Explanation:

DNA polymerase has a proof - reading function. During DNA replication, it can recognize and correct mis - paired nucleotides, which helps prevent mutations. Sister chromatids (A) are formed after DNA replication. tRNA (B) is involved in translation (protein synthesis) not DNA replication error - checking. Having three extra copies of chromosomes (C) is a form of mutation (e.g., trisomy) rather than a mutation - prevention mechanism.

Answer:

D. DNA polymerase checks DNA for errors.