Question

11. A mutation occurs when

i) hydrolysis of a glycosidic bond releases a purine or pyrimidine base.

ii) homologous DNA strands undergo recombination.

iii) DNA polymerase inserts the wrong nucleotide during replication.

iv) damaged DNA is not repaired before the cell divides.

v) All of the above

Answer 1

The answer is option 3 when a dna polymerase inserts wrong nucleotide during replication.

DNA of every organism has a proper sequence which if gets altered due to deletion of any nucleotide, insertions of wrong nucleotide or substitution with any wrong nucleotide causes changes in the DNA sequence which leads to mutations.