WGU C785 BIOCHEMISTRY UNIT EXAM
2026/2027 | Molecular & Clinical
Applications Complete Solution | Pass
Guaranteed - A+ Graded
1. Which four classes represent the major biological macromolecules?
A. Vitamins, minerals, water, and salts
B. Carbohydrates, lipids, proteins, and nucleic acids
C. Glucose, ATP, DNA, and RNA
D. Enzymes, hormones, vitamins, and minerals
Correct Answer: B
Rationale: The four major classes of biological macromolecules are carbohydrates, lipids,
proteins, and nucleic acids.
2. Which element forms the structural backbone of most organic molecules?
A. Sodium
B. Carbon
C. Calcium
D. Chlorine
Correct Answer: B
Rationale: Carbon can form four covalent bonds, allowing it to create diverse chains, rings, and
complex biological structures.
3. A covalent bond is formed when atoms:
A. Transfer neutrons
B. Share electrons
C. Share protons
D. Lose their nuclei
, Correct Answer: B
4. Which bond involves the transfer of electrons from one atom to another?
A. Hydrogen bond
B. Peptide bond
C. Ionic bond
D. Phosphodiester bond
Correct Answer: C
5. Why are hydrogen bonds biologically important?
A. They form the peptide backbone of proteins
B. They contribute to interactions between water molecules and stabilize structures such as
DNA and proteins
C. They permanently transfer electrons
D. They form the carbon skeleton of glucose
Correct Answer: B
6. Water is considered polar because:
A. Its electrons are distributed equally
B. Oxygen attracts electrons more strongly than hydrogen, creating partial charges
C. It contains no covalent bonds
D. It cannot form hydrogen bonds
Correct Answer: B
7. Which property of water helps regulate body temperature?
A. High specific heat
B. Low density as a solid only
C. Lack of polarity
D. Inability to form hydrogen bonds
Correct Answer: A
2026/2027 | Molecular & Clinical
Applications Complete Solution | Pass
Guaranteed - A+ Graded
1. Which four classes represent the major biological macromolecules?
A. Vitamins, minerals, water, and salts
B. Carbohydrates, lipids, proteins, and nucleic acids
C. Glucose, ATP, DNA, and RNA
D. Enzymes, hormones, vitamins, and minerals
Correct Answer: B
Rationale: The four major classes of biological macromolecules are carbohydrates, lipids,
proteins, and nucleic acids.
2. Which element forms the structural backbone of most organic molecules?
A. Sodium
B. Carbon
C. Calcium
D. Chlorine
Correct Answer: B
Rationale: Carbon can form four covalent bonds, allowing it to create diverse chains, rings, and
complex biological structures.
3. A covalent bond is formed when atoms:
A. Transfer neutrons
B. Share electrons
C. Share protons
D. Lose their nuclei
, Correct Answer: B
4. Which bond involves the transfer of electrons from one atom to another?
A. Hydrogen bond
B. Peptide bond
C. Ionic bond
D. Phosphodiester bond
Correct Answer: C
5. Why are hydrogen bonds biologically important?
A. They form the peptide backbone of proteins
B. They contribute to interactions between water molecules and stabilize structures such as
DNA and proteins
C. They permanently transfer electrons
D. They form the carbon skeleton of glucose
Correct Answer: B
6. Water is considered polar because:
A. Its electrons are distributed equally
B. Oxygen attracts electrons more strongly than hydrogen, creating partial charges
C. It contains no covalent bonds
D. It cannot form hydrogen bonds
Correct Answer: B
7. Which property of water helps regulate body temperature?
A. High specific heat
B. Low density as a solid only
C. Lack of polarity
D. Inability to form hydrogen bonds
Correct Answer: A
