BIOS 150 Week 2 Quiz Exam 1 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which biomolecule is the primary source of energy for cells?
A. Lipids
B. Carbohydrates
C. Proteins
D. Nucleic acids
Correct Answer: B. Carbohydrates
Rationale: Glucose and other carbohydrates are quickly metabolized
for energy.
2. Which macromolecule is primarily used for long-term energy
storage?
A. Proteins
B. Carbohydrates
C. Lipids
D. Nucleic acids
,Correct Answer: C. Lipids
Rationale: Lipids store more energy per gram than carbohydrates.
3. Which macromolecule is composed of amino acids?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Correct Answer: B. Proteins
Rationale: Proteins are polymers of amino acids.
4. Which bond stabilizes the primary structure of a protein?
A. Hydrogen
B. Ionic
C. Peptide
D. Covalent
Correct Answer: C. Peptide
Rationale: Peptide bonds link amino acids in a polypeptide chain.
5. Which level of protein structure is determined by hydrogen
bonding in the backbone?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
,Correct Answer: B. Secondary
Rationale: α-helices and β-sheets are stabilized by hydrogen bonds.
6. Denaturation of a protein is caused by:
A. pH change
B. Heat
C. Chemicals
D. All of the above
Correct Answer: D. All of the above
Rationale: Denaturation disrupts the protein’s structure.
7. Enzymes are:
A. Consumed in reactions
B. Biological catalysts
C. Only found in plants
D. Non-specific
Correct Answer: B. Biological catalysts
Rationale: Enzymes speed up reactions without being used up.
8. Which factor can affect enzyme activity?
A. Temperature
B. pH
C. Substrate concentration
D. All of the above
Correct Answer: D. All of the above
, Rationale: Enzyme activity is sensitive to environment and substrate
availability.
9. Which part of the enzyme binds the substrate?
A. Active site
B. Inhibitor site
C. Allosteric site
D. Coenzyme
Correct Answer: A. Active site
Rationale: Substrate fits into the active site for catalysis.
10. Competitive inhibitors:
A. Bind active site
B. Bind elsewhere
C. Denature enzymes
D. Increase substrate binding
Correct Answer: A. Bind active site
Rationale: Compete with the substrate for the active site.
11. Which molecule carries chemical energy in cells?
A. DNA
B. ATP
C. RNA
D. Glucose
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which biomolecule is the primary source of energy for cells?
A. Lipids
B. Carbohydrates
C. Proteins
D. Nucleic acids
Correct Answer: B. Carbohydrates
Rationale: Glucose and other carbohydrates are quickly metabolized
for energy.
2. Which macromolecule is primarily used for long-term energy
storage?
A. Proteins
B. Carbohydrates
C. Lipids
D. Nucleic acids
,Correct Answer: C. Lipids
Rationale: Lipids store more energy per gram than carbohydrates.
3. Which macromolecule is composed of amino acids?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Correct Answer: B. Proteins
Rationale: Proteins are polymers of amino acids.
4. Which bond stabilizes the primary structure of a protein?
A. Hydrogen
B. Ionic
C. Peptide
D. Covalent
Correct Answer: C. Peptide
Rationale: Peptide bonds link amino acids in a polypeptide chain.
5. Which level of protein structure is determined by hydrogen
bonding in the backbone?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
,Correct Answer: B. Secondary
Rationale: α-helices and β-sheets are stabilized by hydrogen bonds.
6. Denaturation of a protein is caused by:
A. pH change
B. Heat
C. Chemicals
D. All of the above
Correct Answer: D. All of the above
Rationale: Denaturation disrupts the protein’s structure.
7. Enzymes are:
A. Consumed in reactions
B. Biological catalysts
C. Only found in plants
D. Non-specific
Correct Answer: B. Biological catalysts
Rationale: Enzymes speed up reactions without being used up.
8. Which factor can affect enzyme activity?
A. Temperature
B. pH
C. Substrate concentration
D. All of the above
Correct Answer: D. All of the above
, Rationale: Enzyme activity is sensitive to environment and substrate
availability.
9. Which part of the enzyme binds the substrate?
A. Active site
B. Inhibitor site
C. Allosteric site
D. Coenzyme
Correct Answer: A. Active site
Rationale: Substrate fits into the active site for catalysis.
10. Competitive inhibitors:
A. Bind active site
B. Bind elsewhere
C. Denature enzymes
D. Increase substrate binding
Correct Answer: A. Bind active site
Rationale: Compete with the substrate for the active site.
11. Which molecule carries chemical energy in cells?
A. DNA
B. ATP
C. RNA
D. Glucose
