Read each scenario below and then complete the paragraphs to illustrate how specific enzymes catalyze various metabolic reactions. Responses will be used more than once.

Scenario 1:
Lactase is produced within the small intestine. Its role is to break down lactose sugars into the simple sugars glucose and galactose. Individuals lacking lactase are considered to be "lactose intolerant".
In scenario 1, lactase is the , lactose sugar is the and the simple sugars are the .
Scenario 2:
When strands of DNA are growing, DNA polymerase recruits nucleotides to create the growing DNA strand. This allows for DNA replication to occur
In scenario 2, DNA polymerase is the , the nucleotides are the and the newly grown strand is the .
Scenario 3:
Rennet is a substance found in calf stomachs to aid in milk digestion. It contains a molecule called rennin which causes milk to curdle, producing curds and whey. Rennin is an important part of cheese production.
In scenario 3, rennin is the , milk is the and curds and whey are the of this reaction.