Cellular Respiration: Pathways and Processes Section 4: Citric Acid Cycle (Krebs Cycle)

Citric Acid Cycle

Second step of cellular respiration oxidizes acetyl CoA, producing ATP and carriers.

Krebs cycle

Another name for the citric acid cycle.

Oxaloacetate

Four-carbon molecule combining with acetyl CoA.

Citrate

Six-carbon compound formed in the citric acid cycle.

FADH2

Reduced FAD is an electron carrier transporting electrons.

Acetyl CoA

Pyruvate oxidation produces high-energy compound for citric acid cycle.

Mitochondrion

Organelle where aerobic respiration occurs (site of the citric acid cycle in eukaryotes).

Enzyme

Catalyst speeding up biochemical reactions (many enzymes involved in the cycle).

Chemical energy

Energy stored in molecular bonds (transformed during the cycle).

Active transport

Energy-dependent movement of molecules across membranes (relevant for moving molecules in/out of mitochondria for the cycle).

High potential energy

Energy-rich state of acetyl CoA (entering the cycle).

Oxidation

Loss of electrons from a substance.