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BMSC 230 METABOLISM MODULE 1-8 questions with correct answers 2024/2025
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BMSC 230 METABOLISM MODULE 1-8 questions with correct answers 2024/2025
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BMSC 230 METABOLISM MODULE 1-8Which of the following features are part of the ATP-ADP cycle in biological systems?
A) ATP hydrolysis is used to drive reactions that require an input of energy.
B) A transmembrane proton-motive force drives ATP synthesis.
C)The oxidation of fuel molecules forms ATP from ADP and Pi.
D)Light energy drives ATP hydrolysis.
E)The oxidation of fuel molecules forms ADP and Pi from ATP. - ANSA, B, and C
Which of the following phrases describe ways by which metabolism is regulated?
A) Control of enzyme activities
B) Accessibility of substrates
C) Temperature cycles
D) Amounts of enzymes
E) Pressure fluxes - ANSA, B, and D
Which of the following functions is not a purpose of metabolism?
A) Extract chemical energy from substances obtained from the external environment.
B) Convert exogenous foodstuffs into building blocks and precursors of macromolecules.
C) Equilibrate extracellular substances and the biomolecules of the cell.
D) Form and degrade the biomolecules of the cell.
E) Assemble the building-block molecules into macromolecules. - ANSC
Glucose 1-phosphate is converted to fructose 6-phosphate in two successive reactions:
Glucose-1-phosphate -----glucose-6-P ΔGo' = -7.1 kJ/mol
Glucose-6-phosphate------fructose-6-P ΔGo' = -1.7 kJ/mol
What is the ΔGo' of the overall reaction? - ANS-8.8 kJ/mol
Which of the following statements about the structure of ATP are correct?
A) The active form is usually in complex with Mg2+ or Mn2+.
B)The nitrogenous base is called adenosine.
C) It contains two phosphate ester bonds.
D) It contains three phosphoanhydride bonds.
E) The sugar moiety is linked to the triphosphate by a phosphate ester bond. - ANSA
Which of the statements below about metabolism is INCORRECT?
A) Metabolism refers to the sum total of chemical reactions that lead to the breakdown or
synthesis of biomolecules.
B) The energy produced from catabolism is captured in the form of ATP, the energy currency of
the cell.
C) Most anabolic reactions, such as building larger molecules from small building block
molecules, do not require the input of energy.
, D) Metabolism is the sum total of catabolism and anabolism. - ANSC) Most anabolic reactions,
such as building larger molecules from small building block molecules, do not require the input
of energy.
Which of the statements below about an amphibolic pathway is CORRECT?
A) It can proceed spontaneously in either direction.
B) It has both positively- and negatively-charged intermediates.
C) It is always interconnected with another pathway.
D) It can function both catabolically and anabolically. - ANSD) It can function both catabolically
and anabolically.
Consider the following reaction, then choose the CORRECT statement about it:
phosphoenolpyruvate + ADP ←→ pyruvate +ATP ΔG = -17 kJ/mol
A) This reaction can readily proceed in either direction in the cell depending on the
concentrations of phosphoenolpyruvate and pyruvate.
B) This reaction strongly favors the forward direction i.e. the production of pyruvate.
C) This reaction strongly favors the reverse reaction i.e. the production of phosphoenolpyruvate
because the degradation of ATP releases much energy
D) The Keq of this reaction is likely around 1.0. - ANSB) This reaction strongly favors the
forward direction i.e. the production of pyruvate.
Which statement about ATP is INCORRECT?
A) When we digest and metabolize fuels, the energy released is captured primarily in the form
of ATP.
B) ATP has two high-energy, ester bonds.
C) While ATP is the main energy currency of the cell, the three other nucleoside triphosphates
(GTP, UTP, CTP) are sometimes used to provide energy.
D) One reason why the hydrolysis of ATP releases so much energy is that the electrostatic
repulsion is reduced. - ANSB) ATP has two high-energy, ester bonds.
How much ATP does our body consume every day on average? - ANS40 kg
Which of the following molecules is an activated carrier of electrons used in many biosynthetic
reactions?
A) NADH
B) FADH2
C) Coenzyme A
D) NADPH - ANSD) NADPH
Which of the following completes this sentence accurately?
Many activated carriers:
A) are small inorganic molecules that function as coenzymes.
B) are derived from vitamin C.
C) participate in isomerase reactions.
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