Biology Enzymes Quiz – 1st Year Science | Interactive Study Tool
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Total Marks: 50
Time: 60 min
Questions: 25

Biology (SNC) – 1st Year

Chapter: #5 – Enzymes
Subject: Biology
Level: 1st Year Science
Type: Practice Quiz

Chapter 5: Enzymes

Multiple Choice Questions (10×1=10)

1
The enzymes that catalyse the reactions in which two molecules are joined together by synthesis of new bonds, using energy from ATP, are placed in group:
A Hydrolase
B Ligase
C Lyase
D Transferase
2
How does a non-competitive inhibitor decrease the rate of an enzyme-catalyzed reaction?
A By binding the active site of the enzyme by changing the free energy change of the reaction
B By changing the shape of the enzyme by changing the free energy change of the reaction
C By changing the free energy change of the reaction
D By acting as a coenzyme for the reaction
3
Which of following is not a classification of enzyme based on reaction type.
A Oxidoreductase
B Hydrolases
C Diastase
D Ligases
4
……… coenzyme is derived from niacin and acts as a hydrogen acceptor.
A FAD
B NAD+
C ATP
D Coenzyme A
5
According to lock and key model ………
A Active sites are rigid and pre-shaped
B Substrates induce enzyme shape changes
C Enzyme work on multiple substrates
D Cofactor modifies the active site
6
In the enzyme reaction sequence E+S→ES→E+P, ES represents:
A Enzyme substrate complex
B Energy state
C Excited substrate
D Enzyme synthesis
7
……… metabolic process directly depends on sequential enzyme action?
A Osmosis
B Protein synthesis
C Diffusion
D Passive transport

Questions 8-10 continue in the same format…

Short Answer Questions (15×2=30)

Detailed Answer Questions (Answer any 2) (2×5=10)

1. Discuss the role of NAD+ as a coenzyme in cellular metabolism. Explain how its conversion to NADH facilitates energy transfer in biochemical reactions.

2. Compare and contrast how competitive and non-competitive inhibitors affect enzyme activity at cellular level including how increasing substrate concentration impacts each type of inhibition.

3. Discuss the medical applications of enzyme inhibitors, providing at least three specific examples of how inhibitors are used in pharmaceuticals and explaining their mechanisms of action.