People who have leukemia, a cancer that affects white blood cells, are often given Cytrabine. This drug inhibits the synthesis of DNA.
S-phase of cell cycle is most affected by Cytrabine because cytrabine interfers with synthesis of DNA and we know that in S-phase of cell cycle synthesis of DNA takes place.
C. They provide instructions for protein synthesis and determine traits.
I think the amount of ATP produced is best distinguishes glycolysis and the Krebs cycle from the electron transport chain.