Anaerobic Respiration

Question 1

Explain why converting pyruvate to ethanol is important in allowing the continue production of atp

Answer 1

Pyruvate accepts the hydrogen molecule from reduced NAD which allows NAD to be recycled

Question 2

Give two ways in which anaerobic respiration of glucose in yeast is similar/different to in a muscle cell

Answer 2

ATP formed and glycolysis takes place but ethanol produced in yeast but lactate in muscle

Question 3

Ethanol fermentation

Answer 3

Pyruvate is first converted to ethanal by the enzyme pyruvate decarboxylase - co2 is produced as a by product

Ethanal is then reduced to ethanol which is catalysed by ethanol dehydrogenase - NADH is oxidised to NAD

Question 4

Lactate fermentation

Answer 4

Pyruvate is reduced to lactate which is catalysed by lactate dehydrogenase - NADH is oxidised to NAD