Enzymes | Past Sindh NTS Mdcat MCQs Sindh Textbook Board
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Review Answers:
1
What is the characteristic of all catalysts? (lumhs 2015)
Correct Answer:C
Explanation:
Catalysts, including enzymes, are not consumed or changed by the reaction they catalyze.
2
The specificity of enzymes is due to their: (dmc 2000)
Correct Answer:D
Explanation:
Enzyme specificity is determined by the unique surface configuration of their active sites.
3
If temperature is reduced to near or below freezing point enzymes become (baheria 2003):
Correct Answer:C
Explanation:
At very low temperatures, enzyme activity decreases but enzymes are not denatured; they become dormant.
4
When a prosthetic group joins with enzymes it forms: (dmc 2008)
Correct Answer:B
Explanation:
A holoenzyme is formed when an apoenzyme (protein part) combines with its prosthetic group.
5
An enzyme increases the speed of a reaction: (dmc, smc 2012)
Correct Answer:B
Explanation:
Enzymes accelerate reactions by reducing the activation energy needed.
6
Some enzymes require the presence of a non-protein molecule to behave catalytically. An enzyme devoid of this molecule is called a (n) (dmc 2013)
Correct Answer:B
Explanation:
An apoenzyme is the protein part of an enzyme without its required non-protein component.
7
The following statements are about enzymes: 1. They are globular proteins. 2. They can be inhibited by competitive inhibitors 3. They are formed in the smooth endoplasmic reticulum. 4. They are only found attached to plasma membranes in the cell. Which statements are correct for all enzymes? (dmc, smc 2015)
Correct Answer:C
Explanation:
Enzymes are globular proteins (1) and can be inhibited competitively (2), but not all are membrane-bound or made in the SER.