What is an enzyme?
Answer and explanation
Correct answer: D. A protein that acts as a biological catalyst by lowering the activation energy of a reaction
- Step 1: Enzymes are made of protein and speed up the chemical reactions of living cells. Step 2. They do this by lowering the activation energy, and they are not used up. Answer: a protein that is a biological catalyst. Why not the others: enzymes are not lipids, hormones or carbohydrates, and they are reused rather than consumed.
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