BIOLOGY 1010 EXAM 2 CSU Stanislaus
BIOL 1010, Fall 2012, Dr. Schoenly
Updated Edition 2026 ACTUAL!!!
1. What is activation energy?
A) The energy released during a chemical reaction
B) The minimum amount of energy required to start a chemical reaction
C) The energy stored in chemical bonds
D) The energy required to break all bonds in a molecule
ANSWER✔✨-: B
Rationale A: Incorrect. Energy released during a reaction is called the reaction's net energy output or
exergonic energy, not activation energy.
Rationale B: Correct. Activation energy is the minimum energy threshold that must be overcome for
reactants to be converted into products in a chemical reaction.
Rationale C: Incorrect. This describes chemical energy, which is potential energy stored in molecular
bonds.
Rationale D: Incorrect. This overstates the requirement; activation energy is not about breaking all
bonds, but rather reaching a transition state.
,2. Where does a substrate bind to an enzyme?
A) Allosteric site
B) Active site
C) Regulatory site
D) Coenzyme site
ANSWER✔✨-: B
Rationale A: Incorrect. The allosteric site is a regulatory site where molecules other than substrates bind
to modulate enzyme activity.
Rationale B: Correct. The active site is the specific region on an enzyme where substrate molecules bind
and undergo chemical reactions.
Rationale C: Incorrect. While regulatory sites exist, the specific binding site for substrates is the active
site.
Rationale D: Incorrect. Coenzymes bind to enzymes but this is not the primary substrate binding
location.
3. Active transport requires:
A) No energy input
B) Energy to move materials against a concentration gradient
C) Only a concentration gradient
D) Passive diffusion
ANSWER✔✨-: B
,Rationale A: Incorrect. Active transport is an energy-requiring process by definition.
Rationale B: Correct. Active transport moves substances against their concentration gradient and
requires energy (usually ATP).
Rationale C: Incorrect. While gradients exist, active transport works against gradients, not with them.
Rationale D: Incorrect. Passive diffusion requires no energy and moves with gradients, unlike active
transport.
4. What does ADP stand for?
A) Adenosine diphosphate
B) Adenine diphosphate
C) Adenosine diphosphide
D) Adenine diphosphide
ANSWER✔✨-: A
Rationale A: Correct. ADP is adenosine diphosphate, composed of adenosine and two phosphate groups.
Rationale B: Incorrect. The molecule is adenosine, not adenine; adenine is the nitrogenous base
component.
Rationale C: Incorrect. The suffix is diphosphate, not diphosphide.
Rationale D: Incorrect. Both the base name and suffix are incorrect.
5. ATP is composed of:
, A) Adenosine and one phosphate group
B) Adenosine and two phosphate groups
C) Adenosine and three phosphate groups
D) Adenine and three phosphate groups
ANSWER✔✨-: C
Rationale A: Incorrect. This describes AMP, not ATP.
Rationale B: Incorrect. This describes ADP, not ATP.
Rationale C: Correct. ATP (adenosine triphosphate) contains adenosine and three phosphate groups.
Rationale D: Incorrect. ATP contains adenosine (adenine + ribose), not just adenine.
6. Which molecule serves as the main energy source for cells?
A) Glucose
B) ATP
C) ADP
D) NADH
ANSWER✔✨-: B
Rationale A: Incorrect. Glucose is an energy source but must be broken down to generate ATP; ATP is
the direct energy currency.
Rationale B: Correct. ATP is the primary energy carrier in all cellular processes.
BIOL 1010, Fall 2012, Dr. Schoenly
Updated Edition 2026 ACTUAL!!!
1. What is activation energy?
A) The energy released during a chemical reaction
B) The minimum amount of energy required to start a chemical reaction
C) The energy stored in chemical bonds
D) The energy required to break all bonds in a molecule
ANSWER✔✨-: B
Rationale A: Incorrect. Energy released during a reaction is called the reaction's net energy output or
exergonic energy, not activation energy.
Rationale B: Correct. Activation energy is the minimum energy threshold that must be overcome for
reactants to be converted into products in a chemical reaction.
Rationale C: Incorrect. This describes chemical energy, which is potential energy stored in molecular
bonds.
Rationale D: Incorrect. This overstates the requirement; activation energy is not about breaking all
bonds, but rather reaching a transition state.
,2. Where does a substrate bind to an enzyme?
A) Allosteric site
B) Active site
C) Regulatory site
D) Coenzyme site
ANSWER✔✨-: B
Rationale A: Incorrect. The allosteric site is a regulatory site where molecules other than substrates bind
to modulate enzyme activity.
Rationale B: Correct. The active site is the specific region on an enzyme where substrate molecules bind
and undergo chemical reactions.
Rationale C: Incorrect. While regulatory sites exist, the specific binding site for substrates is the active
site.
Rationale D: Incorrect. Coenzymes bind to enzymes but this is not the primary substrate binding
location.
3. Active transport requires:
A) No energy input
B) Energy to move materials against a concentration gradient
C) Only a concentration gradient
D) Passive diffusion
ANSWER✔✨-: B
,Rationale A: Incorrect. Active transport is an energy-requiring process by definition.
Rationale B: Correct. Active transport moves substances against their concentration gradient and
requires energy (usually ATP).
Rationale C: Incorrect. While gradients exist, active transport works against gradients, not with them.
Rationale D: Incorrect. Passive diffusion requires no energy and moves with gradients, unlike active
transport.
4. What does ADP stand for?
A) Adenosine diphosphate
B) Adenine diphosphate
C) Adenosine diphosphide
D) Adenine diphosphide
ANSWER✔✨-: A
Rationale A: Correct. ADP is adenosine diphosphate, composed of adenosine and two phosphate groups.
Rationale B: Incorrect. The molecule is adenosine, not adenine; adenine is the nitrogenous base
component.
Rationale C: Incorrect. The suffix is diphosphate, not diphosphide.
Rationale D: Incorrect. Both the base name and suffix are incorrect.
5. ATP is composed of:
, A) Adenosine and one phosphate group
B) Adenosine and two phosphate groups
C) Adenosine and three phosphate groups
D) Adenine and three phosphate groups
ANSWER✔✨-: C
Rationale A: Incorrect. This describes AMP, not ATP.
Rationale B: Incorrect. This describes ADP, not ATP.
Rationale C: Correct. ATP (adenosine triphosphate) contains adenosine and three phosphate groups.
Rationale D: Incorrect. ATP contains adenosine (adenine + ribose), not just adenine.
6. Which molecule serves as the main energy source for cells?
A) Glucose
B) ATP
C) ADP
D) NADH
ANSWER✔✨-: B
Rationale A: Incorrect. Glucose is an energy source but must be broken down to generate ATP; ATP is
the direct energy currency.
Rationale B: Correct. ATP is the primary energy carrier in all cellular processes.
