COMPLETE TEST BANK BIOCHEMISTRY GARRETT,MARY K.CAMPBELLS,SHAWN O, FA
,ALL CHAPTERS AVAILABLE
Chapter 1: The Facts of Life: Chemistry Is the Logic of Biological Phenomena
1) Which of the following attributes is a definitive characteristic of all living
organisms?
A) The ability to move mechanically through space
B) A high degree of chemical complexity and microscopic organization
C) The utilization of silicon as a structural backbone
D) Complete independence from thermodynamic laws
Correct Answer: B
Living organisms possess intricate internal structures, thousands of different proteins, and
precise cellular organization. Movement, alternative backbones like silicon, or defying
thermodynamics are either not universal or physically impossible .
2) Biological macromolecules are primarily constructed from which group of
elements?
A) Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur
B) Carbon, silicon, sodium, potassium, and chlorine
C) Nitrogen, oxygen, iron, copper, and zinc
D) Hydrogen, helium, carbon, and oxygen
Correct Answer: A
These six elements, often abbreviated as CHNOPS, make up over 97% of the mass of most
organisms and constitute the building blocks of proteins, lipids, carbohydrates, and nucleic
acids .
,3) What is the primary thermodynamic driving force that allows non-spontaneous
synthetic reactions to occur in living cells?
A) Earth's magnetic field
B) Coupling with highly exergonic metabolic reactions
C) The continuous lowering of external environmental entropy
D) Spontaneous heat absorption from the vacuum of space
Correct Answer: B
Cells drive endergonic (non-spontaneous) processes by coupling them directly to highly
exergonic (spontaneous) reactions, typically via the hydrolysis of high-energy phosphate
bonds in ATP .
4) If a chemical reaction has a ΔG° > 0, what can be inferred about the reaction under
standard conditions?
A) It will proceed rapidly in the forward direction
B) It releases heat into the surroundings
C) It is endergonic and requires an input of energy to proceed forward
D) It is at perfect dynamic equilibrium
Correct Answer: C
A positive standard free energy change (ΔG° > 0) denotes an endergonic process. It is non-
spontaneous under standard conditions and must absorb free energy to move forward .
5) How do enzymes accelerate the rates of cellular chemical reactions?
A) By changing the net equilibrium constant (Keq) of the reaction
B) By lowering the activation energy (ΔG‡) required for the transition state
C) By adding thermal energy directly into the substrate molecules
D) By making a non-spontaneous reaction spontaneous
, Correct Answer: B
Enzymes accelerate reaction rates by stabilizing the transition state and decreasing the
activation energy barrier. They cannot alter the overall free energy change (ΔG) or shift the
chemical equilibrium position .
6) All are distinctive properties of living systems EXCEPT:
a. Living organisms are relatively simple.
b. Biological structures play a role in the organism's existence.
c. The living state is characterized by the flow of energy through the organism.
d. Living organisms are highly organized.
e. Living organisms are actively engaged in energy transformation.
Correct Answer: a
Living organisms are not relatively simple; they are highly organized and complex .
7) What makes carbon such an abundant element in biomolecules?
a. It can form up to five bonds by sharing its electrons.
b. It forms only single bonds.
c. It provides low bond energy.
d. It forms stable covalent bonds by electron pair sharing.
e. It does not usually bond to other carbons, allowing a more diverse combination of
elements.
Correct Answer: d
Carbon is abundant in biomolecules because it forms stable covalent bonds by sharing
electron pairs. Carbon can form single, double, and triple bonds with itself and other
elements, creating the diverse structures necessary for life .
,ALL CHAPTERS AVAILABLE
Chapter 1: The Facts of Life: Chemistry Is the Logic of Biological Phenomena
1) Which of the following attributes is a definitive characteristic of all living
organisms?
A) The ability to move mechanically through space
B) A high degree of chemical complexity and microscopic organization
C) The utilization of silicon as a structural backbone
D) Complete independence from thermodynamic laws
Correct Answer: B
Living organisms possess intricate internal structures, thousands of different proteins, and
precise cellular organization. Movement, alternative backbones like silicon, or defying
thermodynamics are either not universal or physically impossible .
2) Biological macromolecules are primarily constructed from which group of
elements?
A) Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur
B) Carbon, silicon, sodium, potassium, and chlorine
C) Nitrogen, oxygen, iron, copper, and zinc
D) Hydrogen, helium, carbon, and oxygen
Correct Answer: A
These six elements, often abbreviated as CHNOPS, make up over 97% of the mass of most
organisms and constitute the building blocks of proteins, lipids, carbohydrates, and nucleic
acids .
,3) What is the primary thermodynamic driving force that allows non-spontaneous
synthetic reactions to occur in living cells?
A) Earth's magnetic field
B) Coupling with highly exergonic metabolic reactions
C) The continuous lowering of external environmental entropy
D) Spontaneous heat absorption from the vacuum of space
Correct Answer: B
Cells drive endergonic (non-spontaneous) processes by coupling them directly to highly
exergonic (spontaneous) reactions, typically via the hydrolysis of high-energy phosphate
bonds in ATP .
4) If a chemical reaction has a ΔG° > 0, what can be inferred about the reaction under
standard conditions?
A) It will proceed rapidly in the forward direction
B) It releases heat into the surroundings
C) It is endergonic and requires an input of energy to proceed forward
D) It is at perfect dynamic equilibrium
Correct Answer: C
A positive standard free energy change (ΔG° > 0) denotes an endergonic process. It is non-
spontaneous under standard conditions and must absorb free energy to move forward .
5) How do enzymes accelerate the rates of cellular chemical reactions?
A) By changing the net equilibrium constant (Keq) of the reaction
B) By lowering the activation energy (ΔG‡) required for the transition state
C) By adding thermal energy directly into the substrate molecules
D) By making a non-spontaneous reaction spontaneous
, Correct Answer: B
Enzymes accelerate reaction rates by stabilizing the transition state and decreasing the
activation energy barrier. They cannot alter the overall free energy change (ΔG) or shift the
chemical equilibrium position .
6) All are distinctive properties of living systems EXCEPT:
a. Living organisms are relatively simple.
b. Biological structures play a role in the organism's existence.
c. The living state is characterized by the flow of energy through the organism.
d. Living organisms are highly organized.
e. Living organisms are actively engaged in energy transformation.
Correct Answer: a
Living organisms are not relatively simple; they are highly organized and complex .
7) What makes carbon such an abundant element in biomolecules?
a. It can form up to five bonds by sharing its electrons.
b. It forms only single bonds.
c. It provides low bond energy.
d. It forms stable covalent bonds by electron pair sharing.
e. It does not usually bond to other carbons, allowing a more diverse combination of
elements.
Correct Answer: d
Carbon is abundant in biomolecules because it forms stable covalent bonds by sharing
electron pairs. Carbon can form single, double, and triple bonds with itself and other
elements, creating the diverse structures necessary for life .
