Test Bank For Lehninger Principles of Biochemistry 8th Edition By David L. Nelson; Michael M. Cox | Chapter 1-28 | All Chapters with Answers and Rationales

Test Bank For Lehninger Principles of Biochemistry 8th Edition By David L. Nelson; Michael M. Cox | Chapter 1-28 | All Chapters with Answers and Rationales

A dynamic steady state results when
A) a molecule stops being degraded
B) an organism is at equilibrium with its surroundings
C) there is no net energy transfer
D) the rate of intake or synthesis of a molecule equals
the rate of its disappearance. - ANSWER C
If a chemical reaction starts with 1M concentrations each
of reactants A and B and products C and D, under what
conditions of K′eq and ΔG′° will the reaction proceed in
the forward direction (ΔG′° = RT ln K′eq)?
A) If K′eq is greater than 1 and ΔG′° is negative
B) If K′eq is 0 and ΔG′° is negative
C) If K′eq is negative and ΔG′° is negative
D) If K′eq is less than 1 and ΔG′° is positive. - ANSWER
A
Living cells and organisms
A) exchange energy but not matter with their
surroundings.
B) exchange energy and material with their surroundings.
C) are closed systems
D) are at equilibrium with their surroundings. - ANSWER
 B
The standard free-energy changes of two sequential
chemical reactions are additive only if
A) the reactions share a common intermediate.
B) each reaction has a negative ΔG′°
C) the overall (net) reaction has a postive ΔG′°.
D) the exergonic reaction occurs first. - ANSWER A
Which of the following has a thioester bond?
A) PEP (phosphoenolpyruvate)
B) ATP
C) phosphocreatine
D) acetyl-CoA - ANSWER D
What provides the energy for the synthesis in an RNA
polymer?
A) The transfer of an energy-rich ribonucleoside
monophosphate to the polymer.
B) The hydrolysis of two anhydride bonds in
ribonucleoside triphosphates.
C) The transfer of the γ phosphate of a ribonucleoside
triphosphate to the polymer.
D) The transfer of an energy-rich ribonucleoside
triphosphate to the polymer. - ANSWER B

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