Yeast is unable to use lactose as a substrate Why AYeast doe

Yeast is unable to use lactose as a substrate. Why?

A.Yeast does not have the enzyme lactase to degrade lactose.

B.Lactose is an amino acid.

C.Lactose is not soluble in water.

D.Yeast does not have the transport protein needed to get glucose into the cell.

Solution

Answer:

A.Yeast does not have the enzyme lactase to degrade lactose.

Explanation:

Lactose is such an inefficient substrate in the alcoholic fermentation process. Because, yeast to be able to break down lactose into glucose and galactose, they must produce a special type of enzyme, Beta-Galactosidase, or lactase. And Yeast also doesn’t have carrier proteins for lactose, so it is unable to be used in the normal enzymatic pathway. This means that the yeast will simply die, as there is no energy source for it to be able to metabolise and produce energy.