Question

The first step in catabolism of lactose by the bacteria is ________________ of a linkage bond.

• A. hydrolysis
• B. oxidation
• C. reduction
• D. alkylation

Answer 1

Answer:

A. hydrolysis

• The two sugars, glucose and galactose are linked through a β-galactosidase linkage.

• The first step in lactose catabolism is the hydrolysis of this linkage by the bacterial enzyme β-galactosidase.