12.4: Anaerobic Respiration

Question 1

What two types of anaerobic respiration occurs in eukaryotic cells

Answer 1

1. Production of Ethanol in plants

2. Production of Lactate in animals

Question 2

Anaerobic respiration in Plants

Answer 2

1. The pyruvate molecule at the end of Glycolysis loses a molecule of Co2 and accepts hydrogen from reduced NAD to produce Ethanol

Occurs when there is no oxygen

Question 3

Anaerobic respiration in Animals

Answer 3

1. Each pyruvate molecule takes up two hydrogen atoms from the NAD produced in Glycolysis to form lactate
2. At some point, the lactate is oxidised back into pyruvate to be used in respiration. This occurs when oxygen is available again.

Anaerobic respiration occurs in animals when there is no oxygen and NAD is accumulating and must be removed.

Question 4

Energy Yield from anaerobic respiration

Answer 4

Pyruvate is converted into ethanol or lactate, therefore it cannot be used for the krebs cycle.

The only ATP produced occurs during glycolysis (2 ATP)