Biochemistry Questions and Answers – Bioenergetics and Thermodynamics

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Bioenergetics and Thermodynamics”.

1. If enthalpy change for a reaction is zero, then ∆G° equals to _____________
a) -T∆S°
b) T∆S°
c) -∆H°
d) lnkeq
View Answer

Answer: a
Explanation: From the equation, ∆G° = ∆H°-T∆S°
If ∆H° = 0 then ∆G° = -T∆S°.

2. ∆G° is defined as the ____________
a) Residual energy present in the reactants at equilibrium
b) Residual energy present in the products at equilibrium
c) Difference in the residual energy of reactants and products at equilibrium
d) Energy required in converting one mole of reactants to one mole of products
View Answer

Answer: d
Explanation: ∆G° is defined as the energy required in converting one mole of reactants to one mole of products.

3. For a reaction if ∆G° is positive, then ____________
a) The products will be favored
b) The reactants will be favored
c) The concentration of the reactants and products will be equal
d) All of the reactant will be converted to products
View Answer

Answer: b
Explanation: If ∆G° is negative, products are favored.
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4. Unfolding of regular secondary protein structure causes ____________
a) Large decrease in the entropy of the protein
b) Little increase in the entropy of protein
c) No change in the entropy of the protein
d) Large increase in the entropy of the protein
View Answer

Answer: d
Explanation: Entropy increases on a larger scale when unfolding of secondary protein structure takes place.

5. The study of energy relationships and conversions in biological systems is called as ____________
a) Biophysics
b) Biotechnology
c) Bioenergetics
d) Microbiology
View Answer

Answer: c
Explanation: Bioenergetics is the study of energy relationships and conversions in biological systems.
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6. The relationship between Keq and ∆G‘° is?
a) ∆G‘° = RTlnKeq
b) ∆G‘° = -RTKeq
c) ∆G‘° = RKeq
d) ∆G‘° = -RKeq
View Answer

Answer: b
Explanation: If the system is in equilibrium ∆G° = 0 and ∆G‘° = -RTKeq is the correct relation between Keq and ∆G‘°.

7. What does first law of thermodynamics state?
a) Energy can neither be destroyed nor created
b) Energy cannot be 100 percent efficiently transformed from one type to another
c) All living organisms are composed of cells
d) Input of heat energy increases the rate of movement of atoms and molecules
View Answer

Answer: a
Explanation: First law of thermodynamics can also be termed as law of conservation of energy which states that energy can neither be destroyed nor created but can be transformed from one form of energy to another.
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8. If ∆G‘° of the reaction A → B is -40kJ/mol under standard conditions then the reaction ____________
a) Will never reach equilibrium
b) Will not occur spontaneously
c) Will proceed at a rapid rate
d) Will proceed from left to right spontaneously
View Answer

Answer: d
Explanation: If ∆G‘° < 0, reaction proceeds from left to right that means products are favored.

9. What is the relationship between ∆G and ∆G‘°?
a) ∆G = ∆G‘° + RTln([products]/[reactants])
b) ∆G = ∆G‘° – RTln([products]/[reactants])
c) ∆G = ∆G‘° + RTln([reactants]/[products])
d) ∆G = – ∆G‘° + RTln([reactants]/[products])
View Answer

Answer: a
Explanation: ∆G = ∆G‘° + RTln([products]/[reactants] ) is the correct relation between ∆G and ∆G‘°.
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10. Which of the following statements is false?
a) The reaction tends to go in the forward direction if ∆G is large and positive
b) The reaction tends to move in the backward direction if ∆G is large and negative
c) The system is at equilibrium if ∆G = 0
d) The reaction tends to move in the backward direction if ∆G is large and positive
View Answer

Answer: d
Explanation: The reaction tends to move in the backward direction if ∆G is large and negative.

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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