Enzyme catalysts are highly specific. This property is called: MCQ with Answer and Explanation

Enzyme catalysts are highly specific. This property is called:
A. Optimum temperature
B. Inhibition
C. Substrate specificity
D. Denaturation
Answer: Option C
Solution (By JKSSB Mock Tests)
Enzymes exhibit substrate specificity, meaning each enzyme catalyzes a particular reaction or acts on a specific substrate (lock-and-key model). For example, urease acts only on urea. This specificity is due to the unique shape of the active site. Denaturation is loss of structure, inhibition is blocking activity, optimum temperature is condition for maximum activity.

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Practice More chemistry Questions

Question #1
The reaction of zinc with dilute nitric acid does NOT produce hydrogen because:
A. Nitric acid contains no hydrogen
B. Zinc does not react with acids
C. Nitric acid is a strong oxidizing agent and oxidizes H₂ to water
D. Zinc is less reactive than hydrogen

Correct Answer: Option C


Explanation:
Dilute HNO₃ is an oxidizing agent; it oxidizes the hydrogen produced to water and itself gets reduced to nitrogen oxides (NO, N₂O, etc.). Very dilute HNO₃ with Mg/Mn can produce H₂. Metals above hydrogen normally displace H₂ from non-oxidizing acids like HCl.

This question belongs to: Science chemistry
Question #2
Assertion (A): Hydrogen is a better fuel than CNG. Reason (R): Hydrogen is highly explosive and difficult to store safely.
A. A is true but R is false.
B. Both A and R are true but R is NOT the correct explanation of A.
C. Both A and R are true and R is the correct explanation of A.
D. A is false but R is true.

Correct Answer: Option B


Explanation:
Hydrogen has a higher calorific value than CNG, making it a better fuel in terms of energy output per unit mass. However, R states it is explosive and hard to store, which is a disadvantage, not the reason it is a better fuel. Thus, both are true, but R does not explain A.

This question belongs to: Science chemistry
Question #3
Which of the following gases is a major contributor to the greenhouse effect?
A. Ammonia
B. Nitrogen
C. Carbon dioxide
D. Oxygen

Correct Answer: Option C


Explanation:
CO₂ is the primary anthropogenic greenhouse gas from fossil fuel combustion. N₂, O₂ not IR active. Ammonia is not a major GHG. Methane, N₂O also contribute.

This question belongs to: Science chemistry