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Biomolecules - Proteins and Enzymes NEET MCQ & Practice Questions

Practice Biomolecules - Proteins and Enzymes MCQs for NEET Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Biomolecules - Proteins and Enzymes Revision Guide for NEET Chemistry

Biomolecules - Proteins and Enzymes is part of NEET Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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  • Important equations or relationships
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  • Error review and targeted revision

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Top 20 Biomolecules - Proteins and Enzymes MCQs with Answers

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NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

1. Which principle is essential when solving a quantitative problem in Biomolecules - Proteins and Enzymes?

  • A. Ignoring units
  • B. Assuming all coefficients are unity
  • C. Ignoring limiting conditions
  • D. Conservation of mass and charge where applicable
Answer: D
Explanation: Mass and charge conservation are fundamental.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

2. At equilibrium in a reversible system related to Biomolecules - Proteins and Enzymes, which statement is correct?

  • A. Reactant and product concentrations must be equal
  • B. The catalyst is consumed
  • C. Forward and reverse rates are equal
  • D. All molecular motion stops
Answer: C
Explanation: Dynamic equilibrium has equal forward and reverse rates.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

3. For a spontaneous process at constant T and P in a Biomolecules - Proteins and Enzymes context, ΔG is:

  • A. Always equal to ΔH
  • B. Negative
  • C. Positive
  • D. Always zero
Answer: B
Explanation: Spontaneity at constant T,P requires ΔG<0.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

4. Which statement about a catalyst in Biomolecules - Proteins and Enzymes is correct?

  • A. It lowers the activation barrier without changing K at fixed T
  • B. It changes ΔG°
  • C. It changes reaction enthalpy
  • D. It is always consumed
Answer: A
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

5. Oxidation in a redox step relevant to Biomolecules - Proteins and Enzymes means:

  • A. Gain of electrons
  • B. No oxidation-number change
  • C. Only gain of hydrogen
  • D. Loss of electrons
Answer: D
Explanation: Oxidation is electron loss.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

6. Reduction in a redox step relevant to Biomolecules - Proteins and Enzymes means:

  • A. Increase in oxidation number
  • B. Only loss of hydrogen
  • C. Gain of electrons
  • D. Loss of electrons
Answer: C
Explanation: Reduction is electron gain.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

7. A Lewis acid encountered in Biomolecules - Proteins and Enzymes is an:

  • A. Anion only
  • B. Electron-pair acceptor
  • C. Electron-pair donor
  • D. Proton acceptor only
Answer: B
Explanation: Lewis acids accept electron pairs.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

8. A Lewis base encountered in Biomolecules - Proteins and Enzymes is an:

  • A. Electron-pair donor
  • B. Electron-pair acceptor
  • C. Cation only
  • D. Oxidising agent only
Answer: A
Explanation: Lewis bases donate electron pairs.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

9. Which is a state function useful in Biomolecules - Proteins and Enzymes?

  • A. Heat
  • B. Work
  • C. Path length
  • D. Enthalpy
Answer: D
Explanation: Enthalpy is path independent.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

10. The relation between standard Gibbs energy and equilibrium constant is:

  • A. ΔG°=-KRT
  • B. ΔG°=RT/K
  • C. ΔG°=-RT lnK
  • D. ΔG°=RT lnK
Answer: C
Explanation: The standard thermodynamic relation is ΔG°=-RT lnK.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

11. For a first-order kinetic process in Biomolecules - Proteins and Enzymes, half-life equals:

  • A. [A]0/(2k)
  • B. 0.693/k
  • C. k/0.693
  • D. 1/(k[A]0)
Answer: B
Explanation: First-order t1/2=0.693/k.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

12. The Arrhenius equation is:

  • A. k=Ae^(-Ea/RT)
  • B. k=Ae^(Ea/RT)
  • C. k=EaRT
  • D. k=A/RT
Answer: A
Explanation: Arrhenius equation relates k to activation energy and temperature.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

13. For an ideal dilute solution relevant to Biomolecules - Proteins and Enzymes, molarity is:

  • A. Moles solute per kg solvent
  • B. Grams solute per mole solvent
  • C. Moles solvent per litre
  • D. Moles solute per litre solution
Answer: D
Explanation: M=n/V(L).

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

14. For a weak acid, a larger Ka generally indicates:

  • A. No ionisation
  • B. A stronger conjugate acid
  • C. A stronger acid
  • D. A weaker acid
Answer: C
Explanation: Larger Ka means greater ionisation.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

15. At 25°C, pH+pOH for aqueous solution is:

  • A. 0
  • B. 14
  • C. 7
  • D. 1
Answer: B
Explanation: pH+pOH=pKw=14 at 25°C.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

16. For an electrochemical cell, oxidation occurs at:

  • A. Anode
  • B. Cathode
  • C. Salt bridge
  • D. Electrolyte only
Answer: A
Explanation: Oxidation occurs at the anode.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

17. For an electrochemical cell, reduction occurs at:

  • A. Anode
  • B. Salt bridge
  • C. Wire
  • D. Cathode
Answer: D
Explanation: Reduction occurs at the cathode.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

18. A positive E°cell implies:

  • A. K<1 necessarily
  • B. No spontaneous reaction
  • C. ΔG°<0
  • D. ΔG°>0
Answer: C
Explanation: ΔG°=-nFE°.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

19. Higher bond order generally corresponds to:

  • A. No bond-length effect
  • B. Shorter stronger bond
  • C. Longer weaker bond
  • D. Longer stronger bond
Answer: B
Explanation: Higher bond order strengthens and shortens bonds.

NEET Chemistry · Biomolecules - Proteins and Enzymes · Very Very Hard

20. A nucleophile in an organic reaction related to Biomolecules - Proteins and Enzymes is:

  • A. Electron-pair donor
  • B. Electron-pair acceptor
  • C. Always positively charged
  • D. Always a radical
Answer: A
Explanation: Nucleophiles donate electron pairs.

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