Multiple Choice
Which of the following is an enzyme that cleaves DNA at a specific sequence?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which of the following macromolecules can commonly act as a catalyst in biological systems?
A
Proteins
B
Triglycerides
C
Polysaccharides
D
Phospholipids
Verified step by step guidance1
Understand the concept of a catalyst in biological systems: A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. In biological systems, catalysts are typically enzymes.
Recall that enzymes are specialized proteins that act as biological catalysts. They lower the activation energy required for reactions and are highly specific to the reactions they catalyze.
Evaluate the options: Proteins, triglycerides, polysaccharides, and phospholipids. Proteins are the only macromolecules among these that commonly act as catalysts in biological systems, specifically in the form of enzymes.
Understand why the other options do not act as catalysts: Triglycerides are fats used for energy storage, polysaccharides are carbohydrates used for energy and structural purposes, and phospholipids are components of cell membranes. None of these macromolecules have catalytic functions.
Conclude that proteins are the correct answer because enzymes, which are proteins, are the primary biological catalysts in living organisms.
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