TESTBANK FOR LOOSE LEAF VERSION FOR
LEHNINGER PRINCIPLES OF BIOCHEMISTRY 7TH
EDITION BY DAVID L NELSON COVERING CHAPTER
1-38 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q7A 2027 |INSTANT
DOWNLOAD PDF
1. Which property of water is primarily responsible for its
ability to form hydrogen bonds?
A. Its nonpolar nature
B. Its tetrahedral carbon structure
C. Its polar O–H bonds
D. Its high molecular mass
Answer: C. Its polar O–H bonds
Rationale: Oxygen is more electronegative than hydrogen,
producing partial charges that allow water molecules to form
hydrogen bonds.
2. Which amino acid contains a thiol (-SH) group?
A. Methionine
B. Cysteine
C. Serine
D. Tyrosine
,Answer: B. Cysteine
Rationale: Cysteine contains a sulfhydryl group that can
participate in disulfide bond formation.
3. What type of bond links amino acids together in proteins?
A. Glycosidic bond
B. Phosphodiester bond
C. Peptide bond
D. Ester bond
Answer: C. Peptide bond
Rationale: Peptide bonds form between the carboxyl group of
one amino acid and the amino group of another.
4. Which level of protein structure refers to the amino acid
sequence?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Answer: A. Primary
Rationale: Primary structure is the linear sequence of amino
acid residues in a polypeptide.
5. Which amino acid is classified as an aromatic amino acid?
,A. Valine
B. Phenylalanine
C. Alanine
D. Lysine
Answer: B. Phenylalanine
Rationale: Phenylalanine contains an aromatic benzyl side
chain.
6. What is the main function of buffers in biological systems?
A. Increase enzyme concentration
B. Maintain relatively stable pH
C. Increase ATP production
D. Break peptide bonds
Answer: B. Maintain relatively stable pH
Rationale: Buffers resist changes in pH by accepting or donating
protons.
7. Which functional group characterizes carboxylic acids?
A. -NH₂
B. -SH
C. -COOH
D. -OH
, Answer: C. -COOH
Rationale: A carboxyl group consists of a carbonyl group
attached to a hydroxyl group.
8. Which monosaccharide is an important energy source for
many cells?
A. Glucose
B. Cellulose
C. Glycogen
D. Lactose
Answer: A. Glucose
Rationale: Glucose is a central metabolic fuel and a major
substrate for ATP production.
9. What type of linkage connects monosaccharides in
disaccharides and polysaccharides?
A. Peptide linkage
B. Glycosidic linkage
C. Phosphodiester linkage
D. Disulfide linkage
Answer: B. Glycosidic linkage
Rationale: Glycosidic bonds join carbohydrate residues through
covalent linkages.
LEHNINGER PRINCIPLES OF BIOCHEMISTRY 7TH
EDITION BY DAVID L NELSON COVERING CHAPTER
1-38 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q7A 2027 |INSTANT
DOWNLOAD PDF
1. Which property of water is primarily responsible for its
ability to form hydrogen bonds?
A. Its nonpolar nature
B. Its tetrahedral carbon structure
C. Its polar O–H bonds
D. Its high molecular mass
Answer: C. Its polar O–H bonds
Rationale: Oxygen is more electronegative than hydrogen,
producing partial charges that allow water molecules to form
hydrogen bonds.
2. Which amino acid contains a thiol (-SH) group?
A. Methionine
B. Cysteine
C. Serine
D. Tyrosine
,Answer: B. Cysteine
Rationale: Cysteine contains a sulfhydryl group that can
participate in disulfide bond formation.
3. What type of bond links amino acids together in proteins?
A. Glycosidic bond
B. Phosphodiester bond
C. Peptide bond
D. Ester bond
Answer: C. Peptide bond
Rationale: Peptide bonds form between the carboxyl group of
one amino acid and the amino group of another.
4. Which level of protein structure refers to the amino acid
sequence?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Answer: A. Primary
Rationale: Primary structure is the linear sequence of amino
acid residues in a polypeptide.
5. Which amino acid is classified as an aromatic amino acid?
,A. Valine
B. Phenylalanine
C. Alanine
D. Lysine
Answer: B. Phenylalanine
Rationale: Phenylalanine contains an aromatic benzyl side
chain.
6. What is the main function of buffers in biological systems?
A. Increase enzyme concentration
B. Maintain relatively stable pH
C. Increase ATP production
D. Break peptide bonds
Answer: B. Maintain relatively stable pH
Rationale: Buffers resist changes in pH by accepting or donating
protons.
7. Which functional group characterizes carboxylic acids?
A. -NH₂
B. -SH
C. -COOH
D. -OH
, Answer: C. -COOH
Rationale: A carboxyl group consists of a carbonyl group
attached to a hydroxyl group.
8. Which monosaccharide is an important energy source for
many cells?
A. Glucose
B. Cellulose
C. Glycogen
D. Lactose
Answer: A. Glucose
Rationale: Glucose is a central metabolic fuel and a major
substrate for ATP production.
9. What type of linkage connects monosaccharides in
disaccharides and polysaccharides?
A. Peptide linkage
B. Glycosidic linkage
C. Phosphodiester linkage
D. Disulfide linkage
Answer: B. Glycosidic linkage
Rationale: Glycosidic bonds join carbohydrate residues through
covalent linkages.
