Though the Krebs cycle does not directly require oxygen, it can only take place when oxygen is present because it relies on by-products from the electron transport chain, which requires oxygen. TheKrebs cycle is therefore an aerobic process.
DNA stores the instructions (genetic information) used to build proteins.
Proteins – what they are and how they're made. Proteins are the key working molecules and building blocks in all cells. They are produced in a similar two-step process in all organisms – DNA is first transcribed into RNA, then RNA is translated into protein.
