ESTUDYR
WGU C190 LEARNING OBJECTIVES MODULE 5 MULTICHOICE ANSWERED EXAM
40 QUESTIONS WITH DETAILED RATIONALES
Organic chemistry & macromolecules — (1–40)
1. Which of the following best defines an organic molecule?
A) Any molecule that contains sulfur.
B) Any molecule that contains a carbon–hydrogen (C–H) covalent bond. ⭐
C) Any molecule found only in living organisms.
D) Any molecule that dissolves in water.
⭐Correct Answer: B — any molecule with a C–H bond.
Rationale: Organic chemistry is defined structurally: molecules containing C–H bonds are
considered organic. Presence in living things or water solubility is not required.
2. Which of these is an example of an organic molecule?
A) Sodium chloride (NaCl)
B) Oxygen (O₂)
C) Methane (CH₄) ⭐
D) Carbon dioxide (CO₂)
⭐Correct Answer: C — methane (CH₄).
Rationale: Methane contains C–H bonds; CO₂ has carbon but no C–H bond and is inorganic by
this standard.
3. Which of the following is not generally considered an inorganic molecule?
A) Water (H₂O)
B) Carbon dioxide (CO₂)
C) Glucose (C₆H₁₂O₆) ⭐
D) Oxygen gas (O₂)
⭐Correct Answer: C — glucose.
Rationale: Glucose has C–H bonds so it’s organic; the others are commonly classified as
inorganic (even though CO₂ contains carbon).
4. Which macromolecule class is the primary information-storage molecule in cells?
A) Lipids
B) Carbohydrates
, ESTUDYR
C) Nucleic acids (DNA/RNA) ⭐
D) Proteins
⭐Correct Answer: C — nucleic acids.
Rationale: DNA and RNA store and transmit genetic information; proteins and carbs perform
other roles.
5. Monomers that polymerize to form proteins are called:
A) Monosaccharides
B) Nucleotides
C) Fatty acids
D) Amino acids ⭐
⭐Correct Answer: D — amino acids.
Rationale: Amino acids are the building blocks of proteins linked by peptide bonds.
6. Which statement about lipids is TRUE?
A) All lipids are composed exclusively of amino acids.
B) Lipids are generally nonpolar and hydrophobic. ⭐
C) Lipids always dissolve well in water.
D) Lipids are polymers made solely from nucleotides.
⭐Correct Answer: B — nonpolar and hydrophobic.
Rationale: Lipids (fats, oils, waxes, sterols, phospholipids) are hydrophobic due to long
hydrocarbon chains.
7. Which of the following best describes a triglyceride?
A) Glycerol + three fatty acids ⭐
B) Glycerol + two fatty acids + phosphate
C) Three glycerols linked to a phosphate
D) A ringed steroid structure
⭐Correct Answer: A — glycerol + 3 fatty acids.
Rationale: Triglycerides (fats and oils) are storage lipids made from glycerol and three fatty
acids.
WGU C190 LEARNING OBJECTIVES MODULE 5 MULTICHOICE ANSWERED EXAM
40 QUESTIONS WITH DETAILED RATIONALES
Organic chemistry & macromolecules — (1–40)
1. Which of the following best defines an organic molecule?
A) Any molecule that contains sulfur.
B) Any molecule that contains a carbon–hydrogen (C–H) covalent bond. ⭐
C) Any molecule found only in living organisms.
D) Any molecule that dissolves in water.
⭐Correct Answer: B — any molecule with a C–H bond.
Rationale: Organic chemistry is defined structurally: molecules containing C–H bonds are
considered organic. Presence in living things or water solubility is not required.
2. Which of these is an example of an organic molecule?
A) Sodium chloride (NaCl)
B) Oxygen (O₂)
C) Methane (CH₄) ⭐
D) Carbon dioxide (CO₂)
⭐Correct Answer: C — methane (CH₄).
Rationale: Methane contains C–H bonds; CO₂ has carbon but no C–H bond and is inorganic by
this standard.
3. Which of the following is not generally considered an inorganic molecule?
A) Water (H₂O)
B) Carbon dioxide (CO₂)
C) Glucose (C₆H₁₂O₆) ⭐
D) Oxygen gas (O₂)
⭐Correct Answer: C — glucose.
Rationale: Glucose has C–H bonds so it’s organic; the others are commonly classified as
inorganic (even though CO₂ contains carbon).
4. Which macromolecule class is the primary information-storage molecule in cells?
A) Lipids
B) Carbohydrates
, ESTUDYR
C) Nucleic acids (DNA/RNA) ⭐
D) Proteins
⭐Correct Answer: C — nucleic acids.
Rationale: DNA and RNA store and transmit genetic information; proteins and carbs perform
other roles.
5. Monomers that polymerize to form proteins are called:
A) Monosaccharides
B) Nucleotides
C) Fatty acids
D) Amino acids ⭐
⭐Correct Answer: D — amino acids.
Rationale: Amino acids are the building blocks of proteins linked by peptide bonds.
6. Which statement about lipids is TRUE?
A) All lipids are composed exclusively of amino acids.
B) Lipids are generally nonpolar and hydrophobic. ⭐
C) Lipids always dissolve well in water.
D) Lipids are polymers made solely from nucleotides.
⭐Correct Answer: B — nonpolar and hydrophobic.
Rationale: Lipids (fats, oils, waxes, sterols, phospholipids) are hydrophobic due to long
hydrocarbon chains.
7. Which of the following best describes a triglyceride?
A) Glycerol + three fatty acids ⭐
B) Glycerol + two fatty acids + phosphate
C) Three glycerols linked to a phosphate
D) A ringed steroid structure
⭐Correct Answer: A — glycerol + 3 fatty acids.
Rationale: Triglycerides (fats and oils) are storage lipids made from glycerol and three fatty
acids.
