The carbon-nitrogen-oxygen cycle
A) operates at a slightly lower temperature than the proton-proton chain.
B) is most efficient in star less massive than the sun.
C) occurs when carbon and oxygen combine to form nitrogen, which produces energy.
D) produces the energy responsible for bipolar flows.
E) combines four hydrogen nuclei to form one helium nucleus, which produces energy.

Question

Quizplus · Accepted Answer

The carbon-nitrogen-oxygen (CNO) cycle is a set of nuclear fusion reactions that convert hydrogen into helium, with carbon, nitrogen, and oxygen acting as catalysts. It is an alternative to the proton-proton chain and is dominant in stars more massive than the sun.

The Carbon-Nitrogen-Oxygen Cycle