Multiple Choice
Which type of macromolecule is made up of subunits called amino acids?
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1. Introduction to Biochemistry
Proteins
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Which of the following statements about enzymes is correct?
A
Most enzymes are proteins, but some are RNA molecules.
B
All enzymes are proteins.
C
Enzymes are lipids that catalyze biochemical reactions.
D
Enzymes are exclusively composed of carbohydrates.
Verified step by step guidance1
Understand the definition of enzymes: Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They are typically composed of proteins, but some RNA molecules, known as ribozymes, can also act as enzymes.
Analyze the first statement: 'Most enzymes are proteins, but some are RNA molecules.' This aligns with the definition of enzymes, as most enzymes are indeed proteins, but ribozymes are RNA molecules that also exhibit catalytic activity.
Evaluate the second statement: 'All enzymes are proteins.' This is incorrect because ribozymes are RNA molecules that function as enzymes, proving that not all enzymes are proteins.
Examine the third statement: 'Enzymes are lipids that catalyze biochemical reactions.' This is incorrect because enzymes are not lipids; they are primarily proteins or RNA molecules.
Assess the fourth statement: 'Enzymes are exclusively composed of carbohydrates.' This is incorrect because enzymes are not composed of carbohydrates; they are primarily proteins or RNA molecules.
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