Multiple Choice
Which of the following compounds is NOT an enzyme?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which type of molecule in the human body primarily acts as a biological catalyst?
A
Phospholipid
B
Enzyme
C
Hormone
D
Glycogen
Verified step by step guidance1
Understand the role of a biological catalyst: A biological catalyst is a molecule that speeds up chemical reactions in the body without being consumed in the process. This is a key feature of enzymes.
Analyze the options provided: Phospholipids are structural components of cell membranes, not catalysts. Hormones are signaling molecules that regulate physiological processes, not catalysts. Glycogen is a storage form of glucose, not a catalyst.
Focus on enzymes: Enzymes are specialized proteins that act as biological catalysts. They lower the activation energy of reactions, allowing them to proceed more quickly and efficiently under physiological conditions.
Recall examples of enzyme activity: Enzymes like amylase (which breaks down starch into sugars) and DNA polymerase (which synthesizes DNA) are classic examples of biological catalysts in the human body.
Conclude that the correct answer is 'Enzyme,' as it is the only molecule in the list that fits the definition and function of a biological catalyst.
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