TESTBANK for Fundamentals of Biochemistry Life at the Molecular Level 5th Edition by
Donald Voet, Judith G. Voet, Charlotte W. Pratt Questions and Answers chapter 1-28
1
,Fundamentals of Biochemistry — Practice Exam (Questions 1–50)
Chapters 1–5: Foundations, Water, Amino Acids, Proteins, Enzymes
Multiple Choice (1–20)
Q1. Which of the following is not a major class of biological macromolecules?
A. Carbohydrates
B. Proteins
C. Vitamins
D. Lipids
Answer: C. Vitamins
Q2. Water’s high specific heat is due to:
A. Its polarity
B. Hydrogen bonding
C. Ionic interactions
D. Nonpolar covalent bonds
Answer: B. Hydrogen bonding
Q3. Which amino acid is nonpolar?
A. Serine
B. Leucine
C. Aspartate
D. Lysine
Answer: B. Leucine
Q4. Peptide bonds are formed between:
A. Carboxyl group of one amino acid and amino group of another
B. Two amino groups
C. Two carboxyl groups
D. Amino acid side chains
Answer: A. Carboxyl group of one amino acid and amino group of another
Q5. The primary structure of a protein is:
A. 3D folding
B. Sequence of amino acids
C. α-helix and β-sheet arrangement
D. Assembly of subunits
Answer: B. Sequence of amino acids
Q6. Enzymes accelerate reactions by:
A. Increasing activation energy
B. Decreasing activation energy
C. Changing equilibrium
D. Acting as a reactant
Answer: B. Decreasing activation energy
2
,Q7. Which pH represents a basic solution?
A. 2
B. 7
C. 9
D. 5
Answer: C. 9
Q8. Which of the following is a polar amino acid?
A. Valine
B. Glutamine
C. Alanine
D. Leucine
Answer: B. Glutamine
Q9. Denaturation of a protein can be caused by:
A. Heat
B. pH extremes
C. Organic solvents
D. All of the above
Answer: D. All of the above
Q10. The substrate binds to which part of the enzyme?
A. Allosteric site
B. Active site
C. Regulatory site
D. Catalytic loop
Answer: B. Active site
Q11. Which statement about hydrogen bonds is true?
A. They are stronger than covalent bonds
B. They form between nonpolar molecules
C. They contribute to protein secondary structure
D. They are irreversible
Answer: C. They contribute to protein secondary structure
Q12. Which macromolecule stores genetic information?
A. Protein
B. Lipid
C. Nucleic acid
D. Carbohydrate
Answer: C. Nucleic acid
Q13. Which type of bond stabilizes tertiary protein structure?
A. Hydrogen
B. Ionic
C. Disulfide bridges
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, D. Peptide
Answer: C. Disulfide bridges
Q14. Enzyme specificity is mainly due to:
A. Substrate concentration
B. Enzyme structure
C. pH only
D. Temperature only
Answer: B. Enzyme structure
Q15. Which of the following is a characteristic of enzymes?
A. Permanently consumed
B. Increase reaction rate
C. Change reaction equilibrium
D. None of the above
Answer: B. Increase reaction rate
Q16. Which statement about water is false?
A. Water is polar
B. Water can form hydrogen bonds
C. Water has a low heat capacity
D. Water is a good solvent for polar molecules
Answer: C. Water has a low heat capacity
Q17. The sequence of amino acids in a protein determines:
A. Secondary structure
B. Tertiary structure
C. Function
D. All of the above
Answer: D. All of the above
Q18. A zwitterion is:
A. A charged amino acid with both positive and negative groups
B. A hydrophobic amino acid
C. A protein in its tertiary structure
D. An enzyme-substrate complex
Answer: A. A charged amino acid with both positive and negative groups
Q19. Which cofactor is most commonly required for enzymatic reactions?
A. ATP
B. Metal ions
C. Water
D. Peptide bonds
Answer: B. Metal ions
4
Donald Voet, Judith G. Voet, Charlotte W. Pratt Questions and Answers chapter 1-28
1
,Fundamentals of Biochemistry — Practice Exam (Questions 1–50)
Chapters 1–5: Foundations, Water, Amino Acids, Proteins, Enzymes
Multiple Choice (1–20)
Q1. Which of the following is not a major class of biological macromolecules?
A. Carbohydrates
B. Proteins
C. Vitamins
D. Lipids
Answer: C. Vitamins
Q2. Water’s high specific heat is due to:
A. Its polarity
B. Hydrogen bonding
C. Ionic interactions
D. Nonpolar covalent bonds
Answer: B. Hydrogen bonding
Q3. Which amino acid is nonpolar?
A. Serine
B. Leucine
C. Aspartate
D. Lysine
Answer: B. Leucine
Q4. Peptide bonds are formed between:
A. Carboxyl group of one amino acid and amino group of another
B. Two amino groups
C. Two carboxyl groups
D. Amino acid side chains
Answer: A. Carboxyl group of one amino acid and amino group of another
Q5. The primary structure of a protein is:
A. 3D folding
B. Sequence of amino acids
C. α-helix and β-sheet arrangement
D. Assembly of subunits
Answer: B. Sequence of amino acids
Q6. Enzymes accelerate reactions by:
A. Increasing activation energy
B. Decreasing activation energy
C. Changing equilibrium
D. Acting as a reactant
Answer: B. Decreasing activation energy
2
,Q7. Which pH represents a basic solution?
A. 2
B. 7
C. 9
D. 5
Answer: C. 9
Q8. Which of the following is a polar amino acid?
A. Valine
B. Glutamine
C. Alanine
D. Leucine
Answer: B. Glutamine
Q9. Denaturation of a protein can be caused by:
A. Heat
B. pH extremes
C. Organic solvents
D. All of the above
Answer: D. All of the above
Q10. The substrate binds to which part of the enzyme?
A. Allosteric site
B. Active site
C. Regulatory site
D. Catalytic loop
Answer: B. Active site
Q11. Which statement about hydrogen bonds is true?
A. They are stronger than covalent bonds
B. They form between nonpolar molecules
C. They contribute to protein secondary structure
D. They are irreversible
Answer: C. They contribute to protein secondary structure
Q12. Which macromolecule stores genetic information?
A. Protein
B. Lipid
C. Nucleic acid
D. Carbohydrate
Answer: C. Nucleic acid
Q13. Which type of bond stabilizes tertiary protein structure?
A. Hydrogen
B. Ionic
C. Disulfide bridges
3
, D. Peptide
Answer: C. Disulfide bridges
Q14. Enzyme specificity is mainly due to:
A. Substrate concentration
B. Enzyme structure
C. pH only
D. Temperature only
Answer: B. Enzyme structure
Q15. Which of the following is a characteristic of enzymes?
A. Permanently consumed
B. Increase reaction rate
C. Change reaction equilibrium
D. None of the above
Answer: B. Increase reaction rate
Q16. Which statement about water is false?
A. Water is polar
B. Water can form hydrogen bonds
C. Water has a low heat capacity
D. Water is a good solvent for polar molecules
Answer: C. Water has a low heat capacity
Q17. The sequence of amino acids in a protein determines:
A. Secondary structure
B. Tertiary structure
C. Function
D. All of the above
Answer: D. All of the above
Q18. A zwitterion is:
A. A charged amino acid with both positive and negative groups
B. A hydrophobic amino acid
C. A protein in its tertiary structure
D. An enzyme-substrate complex
Answer: A. A charged amino acid with both positive and negative groups
Q19. Which cofactor is most commonly required for enzymatic reactions?
A. ATP
B. Metal ions
C. Water
D. Peptide bonds
Answer: B. Metal ions
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