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Class 9 – Chapter 7: Enzymes | MCQs (1–20) Section 1: Basic Concepts of Enzymes Enzymes are a) Proteins b) Carbohydrates c) Fats d) Vitamins ✅ Answer: a) Proteins Enzymes are produced by: a) Ribosomes b) Mitochondria c) Chloroplast d) Nucleus ✅ Answer: a) Ribosomes The function of enzymes is to a) Destroy cells b) Slow down reactions c) Speed up reactions d) None of these ✅ Answer: c) Speed up reactions The substance on which an enzyme acts is called: a) Substrate b) Inhibitor c) Catalyst d) Product ✅ Answer: a) Substrate The part of the enzyme where the substrate binds is a) Nucleus b) Active site c) Passive site d) Vacuole ✅ Answer: b) Active site Enzymes are made up of: a) DNA b) Lipids c) Proteins d) RNA ✅ Answer: c) Proteins Enzymes act as a) Inhibitors b) Catalysts c) Products d) Reactants ✅ Answer: b) Catalysts Which of the following affects enzyme activity? a) Light b) Sound c) Temperature d) Electricity ✅ Answe...