enzymes are actually composed of ___________?
Correct answer: B. Proteins
- A. Carbohydrates
- B. Proteins
- C. Nucleic Acid
- D. Fats
Explanation
Most enzymes are globular proteins whose specific three-dimensional shapes form active sites for binding substrates and catalysing reactions. A small number of catalytic RNA molecules, called ribozymes, are exceptions, but proteins are the expected general answer in basic biology. Students may choose nucleic acid because RNA can act as a catalyst, but ribozymes are exceptions rather than the usual enzyme composition.
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About Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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