Topoisomerasesــــــــــــــــــــــــــــــــــ

Question

Topoisomerasesــــــــــــــــــــــــــــــــــ .
A)are antibiotics that kill bacterial cells
B)bend DNA
C)change the level of supercoiling in DNA
D)repair DNA

Accepted Answer

Topoisomerases are enzymes that change the level of supercoiling in DNA. They can either relax supercoiling (type I topoisomerases) or introduce negative supercoiling (type II topoisomerases). They are not antibiotics and do not directly kill bacterial cells, nor do they bend or repair DNA.