Multiple Choice
If all enzymes in a cell were to function at half their usual speed, which of the following would most likely occur?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which of the following enzyme/substrate combinations is matched incorrectly?
A
Pepsin / Protein
B
Lipase / Triglyceride
C
Lactase / Sucrose
D
Amylase / Starch
Verified step by step guidance1
Step 1: Understand the role of enzymes in biochemical reactions. Enzymes are biological catalysts that speed up reactions by binding to specific substrates and converting them into products. Each enzyme is highly specific to its substrate.
Step 2: Review the enzyme/substrate pairs provided in the problem. For example, Pepsin is a protease enzyme that breaks down proteins, Lipase breaks down triglycerides into glycerol and fatty acids, Amylase breaks down starch into maltose, and Lactase breaks down lactose into glucose and galactose.
Step 3: Identify the incorrect pairing by comparing the substrate listed with the enzyme's known specificity. Lactase is specific for lactose, not sucrose. Sucrose is broken down by the enzyme sucrase, not lactase.
Step 4: Confirm the correct pairings for the other enzyme/substrate combinations. Pepsin correctly matches with protein, Lipase correctly matches with triglyceride, and Amylase correctly matches with starch.
Step 5: Conclude that the incorrect enzyme/substrate combination is Lactase/Sucrose, as lactase does not act on sucrose but rather on lactose.
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