Question

lactase is an enzyme that helps babies - and some adults - digest the sugar lactose in milk. in a lab experiment, a student tested the activity of lactase on lactose and sucrose. in the experiment, lactose broke down, but sucrose did not. what is the most likely explanation for the results? a) the active site was blocked by an inhibitor. b) the ph used for the experiment was too low. c) the active site on lactase is specific for lactose. d) the temperature used for the experiment was too low.

Explanation:

Enzymes have specific active - sites for their substrates. Lactase is specific for lactose. Since lactose was broken down but sucrose was not, it indicates that the active - site on lactase is specific for lactose. Other factors like inhibitors, pH, and temperature are not supported by the given results.

Answer:

C) The active site on lactase is specific for lactose.