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Free download in PDF Bioenergetics Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
What is reduction potential?
[A]
The molecule loses an electron
[B]
An atom/molecule gains an electron
[C]
Reducing the power of an electron
[D]
Oxidation power of an electron
Answer: An atom/molecule gains an electron
(2)
What is the name of the molecule which donates its electrons?
[A]
Reducing agent
[B]
Oxidative agent
[C]
Standard reduction potential
[D]
Oxidant
(3)
Which of the following act as a storage form of high energy phosphate?
[A]
Glucose-6-phosphate
[B]
Phosphoenolpyruvate
[C]
Phosphagens
[D]
Glycerol phosphate
(4)
What is the standard free energy change of ATP?
[A]
Small and negative
[B]
Large and positive
[C]
Large and negative
[D]
Small and positive
Answer: Large and negative
(5)
Which of the following equation gives the relationship between ∆G֯ and Keq?
[A]
∆G֯ = -RT ln Keq
[B]
∆G֯ = ln Keq
[C]
∆G = ∆G֯ (-RT Keq)
[D]
∆G = -RT ln Keq
(6)
Which of the following factor is not responsible for the actual change in free energy (∆G)?
[A]
Temperature
[B]
Pressure
[C]
The initial concentration of reactant and products
[D]
pH
(7)
What is the value of ∆G, when a system is in equilibrium?
[A]
∆G = 0
[B]
∆G = 1
[C]
∆G = -1
[D]
∆G = ∆G֯
(8)
Which of the following equation shows the relationship between free energy change (∆G) and the change in entropy (∆S), under constant temperature and pressure?
[A]
∆G = T∆H – ∆S
[B]
∆G = T∆H/∆S
[C]
∆G = ∆H/T∆S
[D]
∆G = ∆H – T∆S
(9)
Law of thermodynamics which states that energy can neither be created nor be destroyed is ___________
[A]
The second law of thermodynamics
[B]
Third law of thermodynamics
[C]
First law of thermodynamics
[D]
Zero-order kinetics
Answer: First law of thermodynamics
(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
Answer: The reaction tends to move in the backward direction if ∆G is large and positive
(11)
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])
Answer: ∆G = ∆G‘° + RTln([products]/[reactants])
(12)
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
Answer: Will proceed from left to right spontaneously
(13)
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
Answer: Energy can neither be destroyed nor created
(14)
The relationship between K‘eq and ∆G‘° is
[A]
∆G‘° = RTlnK‘eq
[B]
∆G‘° = -RTK‘eq
[C]
∆G‘° = RK‘eq
[D]
∆G‘° = -RK‘eq
(15)
The study of energy relationships and conversions in biological systems is called as
[A]
Biophysics
[B]
Biotechnology
[C]
Bioenergetics
[D]
Microbiology
(16)
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
Answer: Large increase in the entropy of the protein
(17)
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
Answer: The reactants will be favored
(18)
∆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
Answer: Energy required in converting one mole of reactants to one mole of products
(19)
If enthalpy change for a reaction is zero, then ∆G° equals to
[A]
-T∆S°
[B]
T∆S°
[C]
-∆H°
[D]
lnkeq
(20)
Which of the following is a chemical link between catabolism and anabolism?
[A]
AMP
[B]
ADP
[C]
ATP
[D]
All of these
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