WCU PHYS 261: Week 1 Quiz Ch. 1, 2 Latest Update 2026
| Exam Prep | 100% Accurate Answers
1. ___________ is the primary energy transferring molecule in cells.
Hydrolysis
Glycolysis
ATP
Dehydration synthesis
Phosphorylation
2. What is the term for the level of protein structure that involves multiple
subunits coming together?
Secondary structure
Tertiary structure
Primary structure
Quaternary structure
3. In a scenario where body temperature rises above the normal range, which
component of the homeostatic control system would first detect this
change?
Effector
Integrator
Hormone
Sensor
,4. When its four identical subunits come together to form a complete voltage-
gated potassium channel, it best illustrates:
tertiary structure
quaternary structure
secondary structure
primary structure
5. How does pH relate to the concentration of hydrogen ions in a solution?
A high pH indicates a high concentration of hydrogen ions
A high pH indicates the solution is an acid
A low pH indicates a high concentration of hydrogen ions
A low pH indicates a low concentration of hydrogen ions
6. The process of homeostasis...
Attempts to keep physiological variables, such as blood glucose
concentration, within a set range
Is used to maintain a stable external environment
Allows the body's internal environment to stay completely constant so
that it never changes
Is not necessary in a healthy individual
7. Describe the impact of denaturation on a protein's function and its biological
significance.
Denaturation allows proteins to bind more effectively to substrates.
Denaturation alters a protein's structure, rendering it unable to
perform its biological function, which can disrupt homeostasis.
, Denaturation enhances a protein's function by making it more flexible.
Denaturation has no effect on a protein's function.
8. What is the term for the type of chemical bond where electrons are shared
equally between atoms?
Ionic bond
Covalent bond
Hydrogen bond
Metallic bond
9. Describe the role of each component of a nucleotide in its function.
The nitrogenous base is involved in protein synthesis, the sugar is a
source of energy, and the phosphate group is a structural component.
The nitrogenous base encodes genetic information, the sugar
provides structural support, and the phosphate group links
nucleotides together.
The nitrogenous base acts as an energy source, the sugar stores
genetic information, and the phosphate group is a signaling molecule.
The nitrogenous base is a lipid, the sugar is a protein, and the
phosphate group is a carbohydrate.
10. Describe how the negative feedback mechanism involving insulin and blood
glucose levels helps maintain homeostasis in the body.
The negative feedback mechanism promotes the continuous increase
of blood glucose levels for energy storage.
The negative feedback mechanism helps maintain homeostasis by
reducing blood glucose levels after they rise, ensuring stable
glucose concentrations.
| Exam Prep | 100% Accurate Answers
1. ___________ is the primary energy transferring molecule in cells.
Hydrolysis
Glycolysis
ATP
Dehydration synthesis
Phosphorylation
2. What is the term for the level of protein structure that involves multiple
subunits coming together?
Secondary structure
Tertiary structure
Primary structure
Quaternary structure
3. In a scenario where body temperature rises above the normal range, which
component of the homeostatic control system would first detect this
change?
Effector
Integrator
Hormone
Sensor
,4. When its four identical subunits come together to form a complete voltage-
gated potassium channel, it best illustrates:
tertiary structure
quaternary structure
secondary structure
primary structure
5. How does pH relate to the concentration of hydrogen ions in a solution?
A high pH indicates a high concentration of hydrogen ions
A high pH indicates the solution is an acid
A low pH indicates a high concentration of hydrogen ions
A low pH indicates a low concentration of hydrogen ions
6. The process of homeostasis...
Attempts to keep physiological variables, such as blood glucose
concentration, within a set range
Is used to maintain a stable external environment
Allows the body's internal environment to stay completely constant so
that it never changes
Is not necessary in a healthy individual
7. Describe the impact of denaturation on a protein's function and its biological
significance.
Denaturation allows proteins to bind more effectively to substrates.
Denaturation alters a protein's structure, rendering it unable to
perform its biological function, which can disrupt homeostasis.
, Denaturation enhances a protein's function by making it more flexible.
Denaturation has no effect on a protein's function.
8. What is the term for the type of chemical bond where electrons are shared
equally between atoms?
Ionic bond
Covalent bond
Hydrogen bond
Metallic bond
9. Describe the role of each component of a nucleotide in its function.
The nitrogenous base is involved in protein synthesis, the sugar is a
source of energy, and the phosphate group is a structural component.
The nitrogenous base encodes genetic information, the sugar
provides structural support, and the phosphate group links
nucleotides together.
The nitrogenous base acts as an energy source, the sugar stores
genetic information, and the phosphate group is a signaling molecule.
The nitrogenous base is a lipid, the sugar is a protein, and the
phosphate group is a carbohydrate.
10. Describe how the negative feedback mechanism involving insulin and blood
glucose levels helps maintain homeostasis in the body.
The negative feedback mechanism promotes the continuous increase
of blood glucose levels for energy storage.
The negative feedback mechanism helps maintain homeostasis by
reducing blood glucose levels after they rise, ensuring stable
glucose concentrations.
