Would anyone please help me with this question?!! Thank you in advance! Which is

Question

Would anyone please help me with this question?!! Thank you in advance!

Which is FALSE: During the oxidation of pyruvate through the PDH reaction and the Krebs Cycle- Select one:

a. three oxygen atoms and nine hydrogen atoms are added to the substrates in various steps

b. the number of hydrogen pairs transferred to electron carriers equals the number of hydrogen atoms that are present in pyruvate

c. the number of oxygen atoms released as CO2 exceeds the number of oxygen atoms present in pyruvate

d. the number of carbon atoms released as CO2 equals the number of carbon atoms present in pyruvate e. all the answers are correct

Explanation / Answer

Answer: -

Option- "e"-all the answers are correct.

Explanation: -

Nothing is false,because during the oxidation of pyruvate through the PDH reaction and the Krebs Cycle

The LINK REACTION step by step

Pyruvate(X2) is produced in the cytoplasm by glycolysis

It is moved by active transport into the mitochondrial matrix

A series of chemical changes occur:

decarboxylation (CO2 removed) by pyruvate decarboxylase

Dehydrogenation (H removed) by pyruvate dehydrogenase

An Acetyl group (2C) is produced which reacts with Coenzyme A to form Acetyl CoA

Acetyl CoA is the end product of the Link Reaction and is needed for the next stage of cell respiration: Krebs cycle (also called the Citric Acid cycle)

note that the Coenzyme A is not used up in the Krebs Cycle but is recycled back to the link reaction to make another Acetyl CoA molecule - thus Coenzyme A acts as a carrier for the acetyl molecule.

Thus in krebs cycle: -

**three oxygen atoms and nine hydrogen atoms are added to the substrates in various steps

**. the number of hydrogen pairs transferred to electron carriers equals the number of hydrogen atoms that are present in pyruvate

** the number of oxygen atoms released as CO2 exceeds the number of oxygen atoms present in pyruvate

** the number of carbon atoms released as CO2 equals the number of carbon atoms present in pyruvate.

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