Krebs Cycle

Question 0

Where does the krebs cycle take place?

Answer 0

The matrix of mitochondria

Question 1

What sort of reactions take place in the kerbs cycle?

Answer 1

Oxidation-reduction reactions

Question 2

What does the 2-carbon acetylcoenzyme A from the link reaction combine with?

Answer 2

A 4-carbon molecule to produce a 6-carbon molecule

Question 3

What happens to the 6 carbon compound in the Krebs cycle?

Answer 3

It loses carbon dioxide and hydrogens to give a 4-carbon molecule and a single molecule of ATP

Question 4

How is the ATP produced in the Krebs cycle?

Answer 4

Substrate level phosphorylation

Question 5

What happens to the 4-carbon molecule after the cycle?

Answer 5

It combines with a new molecule of acetyl coenzyme A to begin the cycle again

Question 6

What are coenzymes?

Answer 6

Molecules that some enzymes require in order to function

Question 7

Coenzymes play a major role in photosynthesis and respiration. What is that role?

Answer 7

They carry hydrogen atoms from one molecule to another

Question 8

Name three types of coenzymes

Answer 8

NAD, FAD, NADP

Question 9

What is the most important carrier in respiration?

Answer 9

NAD

Question 10

The krebs cycle performs an important role in the cells of organisms for 4 reasons. What are they?

Answer 10

Breaks down macromolecules into smaller ones, Produces hydrogen atoms that are carried by NAD to the electron transport chain for oxidative phosphorylation, It regenerates the 4-carbon molecule that combines with acetylcoenzyme A which would otherwise accumulate and it is a source of intermediate compounds used by cells in the manufacture of other substances