Enzymes are affected by pH and temperature because they are: MCQ with Answer and Explanation

Enzymes are affected by pH and temperature because they are:
A. Nucleic acids
B. Proteins
C. Carbohydrates
D. Lipids
Answer: Option B
Solution (By JKSSB Mock Tests)
Enzymes are proteins with complex three-dimensional structures maintained by hydrogen bonds, ionic bonds, and hydrophobic interactions. Extremes of pH or high temperature disrupt these bonds, causing denaturation (loss of structure and function). Each enzyme has an optimum pH and temperature. For example, pepsin works in acidic stomach, trypsin in alkaline intestine.

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Practice More chemistry Questions

Question #1
Distilled water is considered the purest form of water because:
A. It has a high pH
B. It contains beneficial minerals
C. It is carbonated
D. It is free from dissolved salts and impurities

Correct Answer: Option D


Explanation:
Distilled water is produced by boiling water and condensing the steam, leaving behind non-volatile impurities like salts, minerals, and most contaminants. It is almost pure H₂O. Deionized water also has salts removed. However, it may absorb CO₂ and become slightly acidic. It is used in laboratories and batteries.

This question belongs to: Science chemistry
Question #2
Graham's law relates rates of diffusion to:
A. Temperature
B. Volume
C. Pressure
D. Molar mass

Correct Answer: Option D


Explanation:
Rate ∝ 1/√(molar mass) at constant T and P. Lighter gases diffuse faster. This is Graham's law of diffusion/effusion.

This question belongs to: Science chemistry
Question #3
An atom has mass number 31 and 16 neutrons. Its atomic number is:
A. 16
B. 47
C. 31
D. 15

Correct Answer: Option D


Explanation:
Mass number (A) = protons (Z) + neutrons (N). So Z = A - N = 31 - 16 = 15. This is phosphorus (P). Atomic number 15, mass number 31. It has 15 protons and 15 electrons. Number of neutrons = 16. Isotope notation: ³¹₁₅P.

This question belongs to: Science chemistry