8. Respiration

Pyruvate Oxidation

The Link Reaction Explained (Aerobic Respiration)

Pyruvate is reduced, and a molecule of carbon dioxide is removed. The electrons removed in this process are used to oxidize NAD+ to NADH.

 No. You have reduction and oxidation mixed up. 

Pyruvate is oxidized, and a molecule of carbon dioxide is removed. The electrons removed in this process are donated to NADH to produce NAD+.

 No. Though pyruvate is oxidized and a molecule of carbon dioxide is removed, NADH is already reduced, so it cannot accept electrons. 

 Pyruvate is reduced to acetyl-coA, which involves the reduction of pyruvate, the addition of a carbon dioxide from the environment, and its reduction by NADH. 

 No. Although acetyl-coA is the fuel for the citric acid cycle, you have the steps in its production backward. 

 Pyruvate is ionized directly to acetyl-coA. 

 No. There are a number of steps involved in generating the fuel for the citric acid cycle. 

Pyruvate is oxidized, and a molecule of carbon dioxide is removed. The electrons removed in this process are used to reduce NAD+ to NADH.

Think about the reactions that are involved in pyruvate metabolism as it enters the mitochondria.

In preparing pyruvate to enter the citric acid cycle, which of the following steps occurs?

Cellular Respiration 3 - TCA Cycle (Krebs Cycle)

Regulation of Pyruvate Dehydrogenase

BioFlix: Acetyl-CoA Formation

Formation of CO2 and synthesis of ATP

No. CO2 forms, but ATP does not.

Release of CO2 and release of coenzyme A

No. CO2 is released, but coenzyme A is not.

 No. Coenzyme A is incorporated into acetyl CoA. 

No. NAD+ is consumed by this reaction.

Release of CO2 and synthesis of NADH

Consider the reactions that occur during the metabolism of pyruvate from glycolysis.

Which of the following events accompanies the conversion of pyruvate to acetyl CoA before the citric acid cycle?

Metabolism | Transition Stage (Preparatory Phase)

Pyruvate oxidation

Cellular Respiration - Link Reaction and Krebs - Post 16 Biology (A Level, Pre-U, IB, AP Bio)

Acetyl CoA, FADH2, and CO2.

Acetyl CoA, NAD+, ATP, and CO2.

In aerobic cellular respiration, pyruvate molecules must be transformed through a process called pyruvate oxidation before they can be broken down in the Krebs Cycle. What are the products of pyruvate oxidation?a) Acetyl CoA, O2, and ATP.b) Acetyl and CO2.c) Acetyl CoA, FADH2, and CO2.d) Acetyl CoA, NADH, and CO2.e) Acetyl CoA, NAD+, ATP, and CO2.

It connects glycolysis to the citric acid cycle.

Each pyruvate is converted to an acetyl-CoA molecule.

This reaction occurs within the cytoplasm.

Carbon dioxide is released as a by-product.

Each of the following describes the pyruvate oxidation reaction except that _____________________.a) It connects glycolysis to the citric acid cycle.b) Each pyruvate is converted to an acetyl-CoA molecule.c) NAD+ is reduced to NADH.d) This reaction occurs within the cytoplasm.e) Carbon dioxide is released as a by-product.

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