Chemistry Krebs cycle

Where does the Krebs cycle take place in eukaryotic cells?

It occurs in the mitochondrial matrix.

What molecule must combine with oxaloacetate to initiate the Krebs cycle?

Acetyl-CoA (C_{2}).

How many molecules of NADH and FADH_{2} are produced per single turn of the cycle?

• 3 NADH\n- 1 FADH_{2}

What is the primary purpose of the Krebs cycle in cellular respiration?

To oxidize acetyl groups to CO{2} and capture high-energy electrons in the form of NADH and FADH{2} for the electron transport chain.

How many carbon atoms are in the citrate molecule formed in the first step?

Citrate is a 6-carbon (C_{6}) molecule.

Which molecule is regenerated at the end of the Krebs cycle to allow it to continue?

Oxaloacetate (C_{4}).

How many molecules of CO_{2} are released during one complete turn of the Krebs cycle?

2 molecules of CO_{2} are released.

What high-energy phosphate molecule is produced directly during the substrate-level phosphorylation step of the cycle?

GTP (which is frequently converted to ATP).