CHEM 120 WEEK 7 DISCUSSION
QUESTIONS WITH ANSWERS
Section 3: Practice Questions with Rationales
Question 1
Which of the following is a source of lipids?
A. Sugar, fruits, and bread
B. Water
C. Butter and oils
D. Steaks
Answer: C. Butter and oils
Rationale: Lipids are found in fats, oils, and butters . Sugar, fruits, and bread are
carbohydrates. Water is not a macromolecule. Steaks are primarily proteins but also
contain some fats.
Question 2
Triglycerides are:
A. Used for catalysis in the body
B. Made of fatty acid monomers
C. Soluble in water
D. Always unsaturated
, Answer: B. Made of fatty acid monomers
Rationale: Triglycerides are composed of glycerol and three fatty acid chains . They are
not used for catalysis (that's enzymes/proteins). They are insoluble in water
(hydrophobic). They can be saturated or unsaturated.
Question 3
Which of the following is an example of a protein?
A. Bread
B. Olive oil
C. Chicken breast
D. Potato
Answer: C. Chicken breast
Rationale: Chicken breast is a source of protein. Bread and potato are carbohydrates.
Olive oil is a lipid.
Question 4
Which functional group is present in CH₃CH₂OH?
A. Aldehyde
B. Carboxylic acid
C. Alcohol
D. Ether
Answer: C. Alcohol
Rationale: CH₃CH₂OH (ethanol) contains the hydroxyl group (-OH) attached to a
saturated carbon, which defines an alcohol . This is the simplest alcohol (ethanol, found
in alcoholic beverages and hand sanitizers).
QUESTIONS WITH ANSWERS
Section 3: Practice Questions with Rationales
Question 1
Which of the following is a source of lipids?
A. Sugar, fruits, and bread
B. Water
C. Butter and oils
D. Steaks
Answer: C. Butter and oils
Rationale: Lipids are found in fats, oils, and butters . Sugar, fruits, and bread are
carbohydrates. Water is not a macromolecule. Steaks are primarily proteins but also
contain some fats.
Question 2
Triglycerides are:
A. Used for catalysis in the body
B. Made of fatty acid monomers
C. Soluble in water
D. Always unsaturated
, Answer: B. Made of fatty acid monomers
Rationale: Triglycerides are composed of glycerol and three fatty acid chains . They are
not used for catalysis (that's enzymes/proteins). They are insoluble in water
(hydrophobic). They can be saturated or unsaturated.
Question 3
Which of the following is an example of a protein?
A. Bread
B. Olive oil
C. Chicken breast
D. Potato
Answer: C. Chicken breast
Rationale: Chicken breast is a source of protein. Bread and potato are carbohydrates.
Olive oil is a lipid.
Question 4
Which functional group is present in CH₃CH₂OH?
A. Aldehyde
B. Carboxylic acid
C. Alcohol
D. Ether
Answer: C. Alcohol
Rationale: CH₃CH₂OH (ethanol) contains the hydroxyl group (-OH) attached to a
saturated carbon, which defines an alcohol . This is the simplest alcohol (ethanol, found
in alcoholic beverages and hand sanitizers).
