Biology: 6.4

Each Krebs Cycle produces B ATP molecules. In both Krebs Cycle, there is a total of B. Net total after stage 2 - B ATPs.

1 2 4 (2 from glycolysis) (2 from the Krebs cycle because it happens twice)

Pyruvic acid (B carbon) ➡️ Acetyl-CoA (B carbon) ➡️ Citric acid (B-carbon).

3 2 6

Krebs cycle

A series of chemical reactions that will break down pyruvate molecules to form carbon dioxide, ATP, and other energy-carrying molecules.

Formed in glycolysis (Stage I), two pyruvate molecules (3-carbon molecules) will be broken down completely to form B and B in the Krebs cycle. As a result, B will be released as waste and energy will be held in B.

ATP other energy -carrying molecules carbon dioxide NADH

Before the Krebs cycle begins, this molecule forms as a result of pyruvic acid being split by coenzyme-A.

Acetyl-CoA

The 2nd stage in cellular respiration (aerobic) is the B

Krebs Cycle, also known as the citric acid cycle.

oxalocetate (OAA)

a 4-carbon molecule that is recycled in the Krebs Cycle.

What is the first product of the Krebs cycle?

citric acid

Acetyl-CoA can be described as a very B important molecule to the Krebs cycle.

crucial

- Once Acetyl-CoA (2-carbon molecule) is formed, it then binds together with B, which is a 4-carbon molecule that is recycled in the Krebs Cycle. - This reaction will then form a citric acid molecule (B-carbon molecule). - Following this formation, a series of B will break down citric acid so that energy is released and OAA is formed. - Most importantly, THIS PROCESS OCCURS B, due to the two pyruvate, and this forms: - Energy will be held in B & B molecules. - B ATP molecules are formed. - B is released as a waste product.

oxalocetate (OAA) 6 chemical reactions TWICE NADH FADH 2 Carbon dioxide