Question

Glycolysis is a series of chemical reactions (endergonic and exergonic) by which the cell can obtain ATP. NAD+ plays a crucial role in the reactions of glycolysis by:a. donating electrons to ADP to make ATP.b. accepting electrons from glucose, with the result that glucose is partially oxidized to pyruvate.c. converting endergonic reactions to exergonic reactions so that there is an output of energy to make ATP.d. donating electrons to pyruvate when glucose becomes partially oxidized.

Answer 1

The correct answer is .b. accepting electrons from glucose, with the result that glucose is partially oxidized to pyruvate.

Step-by-step explanation:

Glycolysis is the process in which glucose is partially oxidized to two pyruvate molecules. The glycolysis process does not require oxygen and occurs in both anaerobic and aerobic organisms. NAD+ is the molecule which plays a crucial role in glucose oxidation.

Two molecules of NAD+ are utilized in glycolysis. They accept electrons from glucose and get reduced to NADH. So by accepting electrons from glucose, it helps in partial oxidation of glucose into pyruvate molecules. These NADH molecules are regenerated during oxidative phosphorylation and again used in glycolysis. So the correct answer is b.

Answer 2

Option B)

Step-by-step explanation:

• Glycolysis is the process of breaking down glucose in presence of various enzymes. It can take place with or without oxygen if oxygen is involved, then pyruvate is formed and if oxygen is not involved then alcohols or organic acids are formed. After a complete Glycolysis two molecules of pyruvate, two molecules of ATP, two molecules of NADH, and two molecules of water. It takes place in cytoplasm.

• The nicotinamide adenine dinucleotide ( NAD ) acceptes electron in glycolysis . This NAD+ is then converted to NADH(by accepting a electon) which is a reduced electron carrier.
• Furthermore, the NADH produced in glycolysis is used in ATP generation in Electron transport chain(ETC).

Result: NAD+ is reduced by accepting electron from glucose.