Multiple Choice
Which term best describes an enzyme?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
Which of the following enzyme–substrate pairings is correct?
A
Lipase — starch
B
Pepsin — triglycerides
C
Amylase — cellulose
D
Lactase — lactose
Verified step by step guidance1
Step 1: Understand the role of each enzyme by identifying the substrate it acts upon. Enzymes are biological catalysts that specifically bind to their substrates to speed up biochemical reactions.
Step 2: Recall that lipase catalyzes the breakdown of triglycerides (fats), not starch. Starch is a polysaccharide composed of glucose units, which is broken down by amylase.
Step 3: Recognize that pepsin is a protease enzyme that breaks down proteins into peptides, not triglycerides. Triglycerides are broken down by lipase.
Step 4: Know that amylase breaks down starch into simpler sugars like maltose, but it does not act on cellulose. Cellulose is a polysaccharide that requires cellulase for its breakdown.
Step 5: Confirm that lactase specifically hydrolyzes lactose, a disaccharide sugar found in milk, into glucose and galactose. Therefore, the correct enzyme–substrate pairing is lactase — lactose.
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