1st Year Biology Chapter 3 Test03. Enzymes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield or products is to:
   1. Add more of the enzyme
   2. Add more substrate
   3. Add an allosteric inhibitor
   4. Add a noncompetitive inhibitor
2. Who classified enzymes based on reaction types and mechanisms in 1961?
   1. Watson and Crick
   2. International Union of Biochemistry
   3. Pasteur
   4. Fischer
3. The energy that must be added to start a reaction is called:
   1. Potential energy
   2. Kinetic energy
   3. Energy of activation
   4. Thermal energy
4. Oxidoreductases catalyze:
   1. Covalent bond breaking
   2. Hydrolysis reactions
   3. Isomer formation
   4. Oxidation and reduction reactions
5. Which of the following is not a main class of enzymes?
   1. Oxidoreductases
   2. Transferases
   3. Nucleases
   4. Ligases
6. Which of the following has a coenzyme activity?
   1. NAD +
   2. ca ++
   3. Both "a" and "b"
   4. None of them
7. Enzymes that follow the induced fit mechanism are called:
   1. Simple enzymes
   2. Non-regulatory enzymes
   3. Regulatory or allosteric enzymes
   4. Catalytic enzymes
8. The reaction rate of salivary amylase with starch decreases as the concentration of chloride Ions is reduced. Which of the following describe the role of the chloride ions?
   1. Allosteric inhibitors
   2. Cofactors
   3. Coenzyme
   4. Competitive inhibitor
9. Competitive inhibition occurs when:
   1. Inhibitor binds at the active site
   2. Inhibitor binds at another site
   3. Substrate concentration decreases
   4. Temperature increases
10. The temperature at which enzyme shows maximum activity is called:
    1. Optimum temperature
    2. Maximum temperature
    3. Minimum temperature
    4. Denaturation temperature