AP BIOLOGY

Detailed explanation-1: -Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation. However, if oxygen is not present, some organisms can undergo fermentation to continually produce ATP.

Detailed explanation-2: -The glycolysis process truly does not require oxygen to proceed. The glycolysis process converts one molecule of glucose into two molecules of pyruvic acid in the absences of oxygens. Glycolysis takes place in virtually all living cells, including all animal cells, all plant cells, and almost all bacterial cells.

Detailed explanation-3: -Although glycolysis doesn’t require oxygen, the fate of the pyruvate molecules depends on whether oxygen is present. If oxygen isn’t available, the pyruvate is converted to lactate, and no additional ATP is produced from this conversion. If oxygen is present, the pyruvates are transported into the mitochondrial matrix.

Detailed explanation-4: -Glycolysis is an ancient, major ATP-producing pathway that occurs in almost all cells, eukaryotes and prokaryotes alike. This process, which is also known as fermentation, takes place in the cytoplasm and does not require oxygen.

Detailed explanation-5: -If oxygen is not present, glycolysis still proceeds but instead of oxidative phosphorylation, the electron carriers are regenerated through lactic acid fermentation. Our cells prefer to do aerobic respiration because it makes more ATP per glucose molecule.