Question

1. During the aerobic metabolism of glucose, glucose is a. Reduced to form water b. Oxidized to form water c. Reduced to form CO2 d. Oxidized to form CO2 2. Which of the following describes the equation: FAD + XH à FADH2 + X. a. FAD is reduced to FADH2 b. It is a coupled reduction - oxidation reaction c. XH, is oxidized to X d. All of the above 3. Which of the following is FALSE about glycolysis? a. The initial steps of glycolysis requires energy derived from the splitting of 2 molecules of ATP b. The 6 carbon glucose molecule splits producing two 3 carbon molecules of pyruvate as the end product of glycolysis c. Carbon is lost as CO2 d. Each step requires a different enzyme 4. The final electron acceptor of the electron transport chain is: a. ATP b. Water c. Oxygen 5. TRUE or FALSE: The glycolysis pathway is reversible to allow glucose production from specific deaminated amino acids during fasting. a. True b. False 6. What happens to the amino group of deaminated amino acids? a. The liver can metabolize it to glucose by gluconeogenesis. b. The liver metabolize it to urea c. The liver metabolize it to ketones 7. What will happen to the carbon skeleton of the deaminated amino acids when excessive protein and calories are consumed? a. It is metabolized by the liver to urea b. They will be metabolized to fat c. They will be metabolized to ketones

Answer 1

1. During aerobic metabolism of glucose, complete oxidation of glucose takes place in the presence of molecular oxygen where glucose is oxidized into CO₂ & oxygen is reduced to H₂O.

C6H1206 +602 +6CO2 + 6H20+686kcal

So the correct option will be (d).

2.

FAD + XH + FADH2 + X

Here FAD is reduced to FADH₂. It is a coupled oxidation -reduction reaction i.e autoredox reaction where FAD is reduced to FADH₂ & XH₂ is oxidized to X. So the correct option will be (d).

3.The initial steps of gycolysis utilizes energy which is called the activation or energy consuming phase. In the first step one ATP is consumed when glucose is converted to Glucose-6-phosphate & another mole of ATP is consumed in the 3rd step where Fructose-6-phosphate is converted to Fructose-1,6-biphosphate.

The end product of glycolysis is a 3 carbon compound, pyruvic acid which is formed from 1 molecule of Glucose via partial oxidation resulting in 2 molecules of pyruvate. Each steps of glycolysis requires specific enzymes which is functional at that step only, the activity of different enzymes results in the formation of the final product.

In glycolysis, carbon is not lost as CO₂ because no CO₂ is released in any step of reaction. So the correct option is (c).

4. The presence of oxygen is vital, since it regulates the whole process by removing hydrogen from the system. So oxygen acts as the final hydrogen acceptor & terminal electron acceptor in the electron transport chain (ETS). So the correct option is (c).