BIOLOGY 1010 EXAM 2 CSU Stanislaus BIOL
1010, Fall 2012, Dr. Schoenly Updated 2026
Edition ACTUAL!!!
1. What is the minimum amount of energy required to start a chemical reaction?
A) Free energy
B) Activation energy
C) Kinetic energy
D) Potential energy
ANSWER✔✨-: B) Activation energy
Rationale: Activation energy is specifically defined as the minimum energy threshold that must be
overcome for a chemical reaction to proceed. Free energy (A) represents the energy available to do
work, not the energy required to initiate a reaction. Kinetic energy (C) is the energy of motion, which is
unrelated to reaction initiation. Potential energy (D) is stored energy, which is not the same as the
energy barrier for reactions.
2. The specific region on an enzyme where substrate molecules bind is called the:
A) Allosteric site
B) Active site
C) Binding pocket
,D) Regulatory region
ANSWER✔✨-: B) Active site
Rationale: The active site is the specific region on an enzyme where substrate molecules attach and
undergo chemical transformation. An allosteric site (A) is a different region where regulatory molecules
bind, not the catalytic site. A binding pocket (C) is a general term but not the specific enzymatic term.
The regulatory region (D) refers to areas controlling enzyme activity, not substrate binding.
3. Which process requires energy to move materials across a cell membrane against a concentration
gradient?
A) Diffusion
B) Osmosis
C) Active transport
D) Facilitated diffusion
ANSWER✔✨-: C) Active transport
Rationale: Active transport specifically requires energy (typically ATP) to move substances against their
concentration gradient. Diffusion (A) is passive movement from high to low concentration without
energy. Osmosis (B) is passive water movement across membranes. Facilitated diffusion (D) uses
transport proteins but still moves substances down their concentration gradient without energy input.
4. What molecule is composed of adenosine and two phosphate groups?
A) ATP
B) ADP
C) AMP
D) DNA
,ANSWER✔✨-: B) ADP
Rationale: ADP (adenosine diphosphate) consists of adenosine plus two phosphate groups. ATP (A)
contains three phosphate groups. AMP (C) contains only one phosphate group. DNA (D) is a nucleic acid
with a different structure entirely, containing deoxyribose sugar and nitrogenous bases.
5. ATP is composed of adenosine and how many phosphate groups?
A) One
B) Two
C) Three
D) Four
ANSWER✔✨-: C) Three
Rationale: ATP (adenosine triphosphate) contains three phosphate groups. The "tri" in triphosphate
indicates three phosphate groups. One phosphate (A) would be AMP, two (B) would be ADP, and four
(D) does not occur in standard cellular energy molecules.
6. The amount of energy that raises the temperature of 1 gram of water by 1°C is called a:
A) Joule
B) Calorie
C) Kilocalorie
D) Watt
ANSWER✔✨-: B) Calorie
Rationale: A calorie is defined as the amount of heat energy required to raise the temperature of 1 gram
of water by 1°C. A joule (A) is the SI unit of energy (1 calorie = 4.184 joules). A kilocalorie (C) equals 1000
calories. A watt (D) is a unit of power, not energy.
, 7. Energy stored in the chemical bonds of molecules is called:
A) Kinetic energy
B) Chemical energy
C) Thermal energy
D) Mechanical energy
ANSWER✔✨-: B) Chemical energy
Rationale: Chemical energy is specifically the potential energy stored in the chemical bonds between
atoms and molecules. Kinetic energy (A) is energy of motion. Thermal energy (C) is heat energy from
molecular motion. Mechanical energy (D) involves macroscopic motion and forces.
8. What term describes the difference in the density of a chemical substance between two regions?
A) Electrical gradient
B) Concentration gradient
C) Pressure gradient
D) Thermal gradient
ANSWER✔✨-: B) Concentration gradient
Rationale: A concentration gradient refers to the difference in concentration (density) of a substance
across a space or membrane. An electrical gradient (A) involves charge differences. A pressure gradient
(C) involves pressure differences. A thermal gradient (D) involves temperature differences.
9. The principle that energy cannot be created or destroyed, only transformed, is known as:
A) Conservation of energy
1010, Fall 2012, Dr. Schoenly Updated 2026
Edition ACTUAL!!!
1. What is the minimum amount of energy required to start a chemical reaction?
A) Free energy
B) Activation energy
C) Kinetic energy
D) Potential energy
ANSWER✔✨-: B) Activation energy
Rationale: Activation energy is specifically defined as the minimum energy threshold that must be
overcome for a chemical reaction to proceed. Free energy (A) represents the energy available to do
work, not the energy required to initiate a reaction. Kinetic energy (C) is the energy of motion, which is
unrelated to reaction initiation. Potential energy (D) is stored energy, which is not the same as the
energy barrier for reactions.
2. The specific region on an enzyme where substrate molecules bind is called the:
A) Allosteric site
B) Active site
C) Binding pocket
,D) Regulatory region
ANSWER✔✨-: B) Active site
Rationale: The active site is the specific region on an enzyme where substrate molecules attach and
undergo chemical transformation. An allosteric site (A) is a different region where regulatory molecules
bind, not the catalytic site. A binding pocket (C) is a general term but not the specific enzymatic term.
The regulatory region (D) refers to areas controlling enzyme activity, not substrate binding.
3. Which process requires energy to move materials across a cell membrane against a concentration
gradient?
A) Diffusion
B) Osmosis
C) Active transport
D) Facilitated diffusion
ANSWER✔✨-: C) Active transport
Rationale: Active transport specifically requires energy (typically ATP) to move substances against their
concentration gradient. Diffusion (A) is passive movement from high to low concentration without
energy. Osmosis (B) is passive water movement across membranes. Facilitated diffusion (D) uses
transport proteins but still moves substances down their concentration gradient without energy input.
4. What molecule is composed of adenosine and two phosphate groups?
A) ATP
B) ADP
C) AMP
D) DNA
,ANSWER✔✨-: B) ADP
Rationale: ADP (adenosine diphosphate) consists of adenosine plus two phosphate groups. ATP (A)
contains three phosphate groups. AMP (C) contains only one phosphate group. DNA (D) is a nucleic acid
with a different structure entirely, containing deoxyribose sugar and nitrogenous bases.
5. ATP is composed of adenosine and how many phosphate groups?
A) One
B) Two
C) Three
D) Four
ANSWER✔✨-: C) Three
Rationale: ATP (adenosine triphosphate) contains three phosphate groups. The "tri" in triphosphate
indicates three phosphate groups. One phosphate (A) would be AMP, two (B) would be ADP, and four
(D) does not occur in standard cellular energy molecules.
6. The amount of energy that raises the temperature of 1 gram of water by 1°C is called a:
A) Joule
B) Calorie
C) Kilocalorie
D) Watt
ANSWER✔✨-: B) Calorie
Rationale: A calorie is defined as the amount of heat energy required to raise the temperature of 1 gram
of water by 1°C. A joule (A) is the SI unit of energy (1 calorie = 4.184 joules). A kilocalorie (C) equals 1000
calories. A watt (D) is a unit of power, not energy.
, 7. Energy stored in the chemical bonds of molecules is called:
A) Kinetic energy
B) Chemical energy
C) Thermal energy
D) Mechanical energy
ANSWER✔✨-: B) Chemical energy
Rationale: Chemical energy is specifically the potential energy stored in the chemical bonds between
atoms and molecules. Kinetic energy (A) is energy of motion. Thermal energy (C) is heat energy from
molecular motion. Mechanical energy (D) involves macroscopic motion and forces.
8. What term describes the difference in the density of a chemical substance between two regions?
A) Electrical gradient
B) Concentration gradient
C) Pressure gradient
D) Thermal gradient
ANSWER✔✨-: B) Concentration gradient
Rationale: A concentration gradient refers to the difference in concentration (density) of a substance
across a space or membrane. An electrical gradient (A) involves charge differences. A pressure gradient
(C) involves pressure differences. A thermal gradient (D) involves temperature differences.
9. The principle that energy cannot be created or destroyed, only transformed, is known as:
A) Conservation of energy
