Question

Which statement is correct about DNA mutation and DNA repair? A. DNA mutation always leads to an impaired protein function A Question Progress A B. All organisms have elaborate mechanisms to repair DNA damage C. DNA mutation is a temporary change in DNA sequence D. Environmental mutagens are safe and won't cause cancer E. Homologous recombination is a type of genetic recombination in which nucleotide sequences are exchanged between two totally different molecules of DNA Reset Selection

Answer 1

Answer: Correct statement about DNA mutation and DNA repair is- B. All organisms have elaborate mechanisms to repair DNA damage.

Explanation-  

Generally, mutations result in reducedprotein function or no protein function. A mutation that results in no protein function is called a null mutation. A null mutation in a gene that usually encodes a specific enzyme leads to the production of a nonfunctional enzyme or no enzyme.

DNA repair is an important way in which the body protects itself from disease. Once DNA damage has given rise to a mutation, the mutation cannot be repaired. So, DNA repair processes exist in both prokaryotic and eukaryotic organisms.

A gene mutation is a permanent alteration in the DNA sequence .

The mutagen produces mutations in the DNA, and deleterious mutation can result in aberrant, impaired or loss of function for a particular gene. Environmental mutagens may be carcinogens also( Reactive Oxygen Species, UV ray etc).

Homologous recombination is a type of geneticrecombination in which nucleotide sequences are exchanged between two similar or identical molecules of DNA.