BIOS 255 Week 3 Quiz Exam 3 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which type of bond connects amino acids in a protein?
A. Hydrogen bond
B. Peptide bond
C. Ionic bond
D. Covalent bond
Correct Answer: B
Rationale: Peptide bonds link amino acids via a condensation
reaction.
2. Which level of protein structure is defined by alpha-helices and
beta-sheets?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: B
,Rationale: Secondary structure refers to localized folding patterns
like alpha-helices and beta-sheets.
3. Which level of protein structure refers to the overall 3D shape
of a single polypeptide?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: C
Rationale: Tertiary structure describes the complete 3D folding of
one polypeptide.
4. Which level of protein structure involves multiple polypeptide
chains?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: D
Rationale: Quaternary structure arises when multiple polypeptides
form a functional protein.
5. Which molecule stores genetic information in cells?
,A. DNA
B. RNA
C. Protein
D. Lipid
Correct Answer: A
Rationale: DNA contains hereditary information encoded in
nucleotides.
6. Which sugar is found in DNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: B
Rationale: DNA contains deoxyribose, which lacks one oxygen
compared to ribose.
7. Which sugar is found in RNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: A
Rationale: RNA contains ribose, which has a hydroxyl group at the
2’ carbon.
, 8. Which nitrogenous base pairs with guanine in DNA?
A. Adenine
B. Thymine
C. Cytosine
D. Uracil
Correct Answer: C
Rationale: Guanine forms three hydrogen bonds with cytosine.
9. Which nitrogenous base pairs with adenine in DNA?
A. Adenine
B. Thymine
C. Cytosine
D. Uracil
Correct Answer: B
Rationale: Adenine pairs with thymine via two hydrogen bonds in
DNA.
10. Which nucleotide is found in RNA but not DNA?
A. Thymine
B. Uracil
C. Adenine
D. Cytosine
Correct Answer: B
Rationale: Uracil replaces thymine in RNA.
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which type of bond connects amino acids in a protein?
A. Hydrogen bond
B. Peptide bond
C. Ionic bond
D. Covalent bond
Correct Answer: B
Rationale: Peptide bonds link amino acids via a condensation
reaction.
2. Which level of protein structure is defined by alpha-helices and
beta-sheets?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: B
,Rationale: Secondary structure refers to localized folding patterns
like alpha-helices and beta-sheets.
3. Which level of protein structure refers to the overall 3D shape
of a single polypeptide?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: C
Rationale: Tertiary structure describes the complete 3D folding of
one polypeptide.
4. Which level of protein structure involves multiple polypeptide
chains?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Correct Answer: D
Rationale: Quaternary structure arises when multiple polypeptides
form a functional protein.
5. Which molecule stores genetic information in cells?
,A. DNA
B. RNA
C. Protein
D. Lipid
Correct Answer: A
Rationale: DNA contains hereditary information encoded in
nucleotides.
6. Which sugar is found in DNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: B
Rationale: DNA contains deoxyribose, which lacks one oxygen
compared to ribose.
7. Which sugar is found in RNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: A
Rationale: RNA contains ribose, which has a hydroxyl group at the
2’ carbon.
, 8. Which nitrogenous base pairs with guanine in DNA?
A. Adenine
B. Thymine
C. Cytosine
D. Uracil
Correct Answer: C
Rationale: Guanine forms three hydrogen bonds with cytosine.
9. Which nitrogenous base pairs with adenine in DNA?
A. Adenine
B. Thymine
C. Cytosine
D. Uracil
Correct Answer: B
Rationale: Adenine pairs with thymine via two hydrogen bonds in
DNA.
10. Which nucleotide is found in RNA but not DNA?
A. Thymine
B. Uracil
C. Adenine
D. Cytosine
Correct Answer: B
Rationale: Uracil replaces thymine in RNA.
