BIOS 150 Week 2 Quiz Exam 2 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which element is the most abundant in organic molecules?
A. Nitrogen
B. Carbon
C. Oxygen
D. Hydrogen
Correct Answer: B. Carbon
Rationale: Carbon forms the backbone of all organic molecules.
2. Which type of bond forms between water molecules?
A. Ionic
B. Covalent
C. Hydrogen
D. Peptide
Correct Answer: C. Hydrogen
Rationale: Weak hydrogen bonds give water unique properties.
,3. Which biomolecule is the main structural component of cell
membranes?
A. Carbohydrates
B. Phospholipids
C. Proteins
D. Nucleic acids
Correct Answer: B. Phospholipids
Rationale: Phospholipids form bilayers essential for membrane
integrity.
4. Saturated fats are:
A. Liquid at room temperature
B. Solid at room temperature
C. Contain double bonds
D. Essential amino acids
Correct Answer: B. Solid at room temperature
Rationale: Saturated fats have no double bonds, so they pack
tightly.
5. Unsaturated fats contain:
A. Only single bonds
B. Double bonds
C. Peptide bonds
D. Monosaccharides
Correct Answer: B. Double bonds
,Rationale: Double bonds introduce kinks, making them liquid at
room temperature.
6. Which macromolecule stores genetic information?
A. DNA
B. RNA
C. Protein
D. Lipid
Correct Answer: A. DNA
Rationale: DNA encodes the hereditary instructions for organisms.
7. RNA differs from DNA because it:
A. Is double-stranded
B. Contains ribose
C. Has thymine
D. Is longer
Correct Answer: B. Contains ribose
Rationale: RNA uses ribose sugar and uracil instead of thymine.
8. The primary structure of a protein is:
A. Sequence of amino acids
B. α-helix
C. 3D folding
D. Multiple subunits
Correct Answer: A. Sequence of amino acids
, Rationale: The linear sequence determines higher levels of
structure.
9. The secondary structure of proteins involves:
A. Peptide bonds only
B. Hydrogen bonds forming α-helices or β-sheets
C. Disulfide bridges
D. Hydrophobic interactions
Correct Answer: B. Hydrogen bonds forming α-helices or β-
sheets
Rationale: Backbone hydrogen bonds stabilize local folding.
10. Tertiary protein structure is stabilized by:
A. Hydrogen bonds only
B. Ionic, hydrogen, hydrophobic, and disulfide bonds
C. Peptide bonds
D. Phosphodiester bonds
Correct Answer: B. Ionic, hydrogen, hydrophobic, and disulfide
bonds
Rationale: Interactions among side chains create 3D structure.
11. Quaternary protein structure involves:
A. Single polypeptide
B. Interaction of multiple polypeptides
C. Hydrogen bonds in backbone
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which element is the most abundant in organic molecules?
A. Nitrogen
B. Carbon
C. Oxygen
D. Hydrogen
Correct Answer: B. Carbon
Rationale: Carbon forms the backbone of all organic molecules.
2. Which type of bond forms between water molecules?
A. Ionic
B. Covalent
C. Hydrogen
D. Peptide
Correct Answer: C. Hydrogen
Rationale: Weak hydrogen bonds give water unique properties.
,3. Which biomolecule is the main structural component of cell
membranes?
A. Carbohydrates
B. Phospholipids
C. Proteins
D. Nucleic acids
Correct Answer: B. Phospholipids
Rationale: Phospholipids form bilayers essential for membrane
integrity.
4. Saturated fats are:
A. Liquid at room temperature
B. Solid at room temperature
C. Contain double bonds
D. Essential amino acids
Correct Answer: B. Solid at room temperature
Rationale: Saturated fats have no double bonds, so they pack
tightly.
5. Unsaturated fats contain:
A. Only single bonds
B. Double bonds
C. Peptide bonds
D. Monosaccharides
Correct Answer: B. Double bonds
,Rationale: Double bonds introduce kinks, making them liquid at
room temperature.
6. Which macromolecule stores genetic information?
A. DNA
B. RNA
C. Protein
D. Lipid
Correct Answer: A. DNA
Rationale: DNA encodes the hereditary instructions for organisms.
7. RNA differs from DNA because it:
A. Is double-stranded
B. Contains ribose
C. Has thymine
D. Is longer
Correct Answer: B. Contains ribose
Rationale: RNA uses ribose sugar and uracil instead of thymine.
8. The primary structure of a protein is:
A. Sequence of amino acids
B. α-helix
C. 3D folding
D. Multiple subunits
Correct Answer: A. Sequence of amino acids
, Rationale: The linear sequence determines higher levels of
structure.
9. The secondary structure of proteins involves:
A. Peptide bonds only
B. Hydrogen bonds forming α-helices or β-sheets
C. Disulfide bridges
D. Hydrophobic interactions
Correct Answer: B. Hydrogen bonds forming α-helices or β-
sheets
Rationale: Backbone hydrogen bonds stabilize local folding.
10. Tertiary protein structure is stabilized by:
A. Hydrogen bonds only
B. Ionic, hydrogen, hydrophobic, and disulfide bonds
C. Peptide bonds
D. Phosphodiester bonds
Correct Answer: B. Ionic, hydrogen, hydrophobic, and disulfide
bonds
Rationale: Interactions among side chains create 3D structure.
11. Quaternary protein structure involves:
A. Single polypeptide
B. Interaction of multiple polypeptides
C. Hydrogen bonds in backbone
