Related Pathways

Question 1

Lipid catabolism

Answer 1

Triglycerides break into glycerol and fatty acids

Glycerol can be converted into glucose in a process called gluconeogenesis

Fatty acids travel to the mitochondrial matrix for B-oxidation

Acetyl groups combined with coA to form acetyl coA

Acetyl coA enters the Krebs cycle

The amount of energy produced depends on the length of fatty acid tails

Question 2

Lactic acid fermentation

Answer 2

During strenuous activity, cells use glucose faster than oxygen is supplied

NADH from glycolysis transfers H atoms to pyruvate reforming NAD+ so glycolysis can continue

This forms lactate

When enough oxygen is present, lactate oxidizes back to pyruvate

Question 3

Ethanol fermentation (not in humans)

Answer 3

NADH passes H atoms to acetyl aldehyde (formed in glycolysis) to form ethanol

NAD+ is reformed and glycolysis continues

Occurs in yeast, and is used to make beer, wine, bread, soy sauce

Question 4

Protein catabolism

Answer 4

Amino groups are removed from amino acids in the process of deaminaton

This forms ammonia, a waste product in animals and a useful by product in plants

Other reactions convert the rest of aa into components of Krebs or glycolysis
EX. Leucine turns into acetyl-coA