Question

glycolysis is the first stage of cellular respiration and is an anaerobic process. during glycolysis, glucose is converted to two molecules of pyruvic acid. how is glycolysis kept functioning during cellular respiration? a. two high - energy electrons are passed to the carrier nadh, which transports electrons back to glycolysis. b. two molecules of atp from the cell are invested at the beginning of the process of glycolysis. c. pyruvic acid from glycolysis reacts to form acetyl - coa, which then combines with a four - carbon compound in the krebs cycle and re - enters glycolysis. d. hydrogen ions pass back across the mitochondrial membrane through chemiosmosis and re - enter glycolysis.

Explanation:

Glycolysis requires an initial energy investment. At the start of glycolysis, 2 ATP molecules are used to prime the glucose molecule for further breakdown. This investment allows the process to continue and ultimately results in a net gain of ATP. Option A is incorrect as NADH is a product of glycolysis and is used in later stages of cellular respiration, not to directly keep glycolysis going. Option C describes events that occur after glycolysis in the transition to the Krebs cycle and is not related to maintaining glycolysis. Option D describes events of chemiosmosis which occur in the electron - transport chain and not in glycolysis maintenance.

Answer:

B. Two molecules of ATP from the cell are invested at the beginning of the process of glycolysis.