Classes
DNA topoisomerases are divided into two classes: type I enzymes (EC; topoisomerases I, III and V) break single-strand DNA, and type II enzymes (EC; topoisomerases II, IV and VI) break double-strand DNA.
Read more about this topic: Type I Topoisomerase
Famous quotes containing the word classes:
“One marvels why ... the middle classes still insist on so much discomfort for their children at such expense to themselves.”
—E.M. (Edward Morgan)
“Solidity, caution, integrity, efficiency. Lack of imagination, hypocrisy. These qualities characterize the middle classes in every country, but in England they are national characteristics.”
—E.M. (Edward Morgan)
“When we of the so-called better classes are scared as men were never scared in history at material ugliness and hardship; when we put off marriage until our house can be artistic, and quake at the thought of having a child without a bank-account and doomed to manual labor, it is time for thinking men to protest against so unmanly and irreligious a state of opinion.”
—William James (1842–1910)