CHEM 120
Intro to General, Organic & Biological
Chemistry
Comprehensive Midterms Review (Qns &
Ans)
2025
1. Which of the following elements is essential for the structure
of proteins, nucleic acids, and cellular energy molecules such as
ATP?
- A) Carbon
- B) Nitrogen
- C) Hydrogen
©/2025
, - D) Oxygen
- ANS: B) Nitrogen
- Rationale: Nitrogen is a key component of amino acids,
nucleotides, and ATP, playing a crucial role in the structure and
function of proteins, nucleic acids, and cellular energy molecules.
2. In organic chemistry, what type of reaction occurs when an
alcohol is converted to an aldehyde?
- A) Hydrolysis
- B) Reduction
- C) Oxidation
- D) Condensation
- ANS: C) Oxidation
- Rationale: The conversion of an alcohol to an aldehyde
involves the loss of hydrogen atoms or the gain of oxygen atoms,
which is characteristic of an oxidation reaction.
Fill-in-the-Blank Questions
3. The __________ bond is a type of covalent bond where
electrons are shared unequally between atoms, resulting in a
molecule with a partial positive and partial negative charge.
- ANS: polar
©/2025
, - Rationale: A polar bond occurs when electrons are shared
unequally between atoms, creating a dipole moment with partial
positive and negative charges.
4. The simplest form of carbohydrate, consisting of a single
sugar molecule, is called a __________.
- ANS: monosaccharide
- Rationale: A monosaccharide is the simplest form of
carbohydrate, consisting of a single sugar molecule such as
glucose or fructose.
True/False Questions
5. True or False: Enzymes are proteins that catalyze biochemical
reactions without being consumed in the process.
- ANS: True
- Rationale: Enzymes are biological catalysts that speed up
biochemical reactions without being consumed or permanently
altered.
6. True or False: In a chemical equilibrium, the concentrations of
reactants and products are equal.
- ANS: False
©/2025
Intro to General, Organic & Biological
Chemistry
Comprehensive Midterms Review (Qns &
Ans)
2025
1. Which of the following elements is essential for the structure
of proteins, nucleic acids, and cellular energy molecules such as
ATP?
- A) Carbon
- B) Nitrogen
- C) Hydrogen
©/2025
, - D) Oxygen
- ANS: B) Nitrogen
- Rationale: Nitrogen is a key component of amino acids,
nucleotides, and ATP, playing a crucial role in the structure and
function of proteins, nucleic acids, and cellular energy molecules.
2. In organic chemistry, what type of reaction occurs when an
alcohol is converted to an aldehyde?
- A) Hydrolysis
- B) Reduction
- C) Oxidation
- D) Condensation
- ANS: C) Oxidation
- Rationale: The conversion of an alcohol to an aldehyde
involves the loss of hydrogen atoms or the gain of oxygen atoms,
which is characteristic of an oxidation reaction.
Fill-in-the-Blank Questions
3. The __________ bond is a type of covalent bond where
electrons are shared unequally between atoms, resulting in a
molecule with a partial positive and partial negative charge.
- ANS: polar
©/2025
, - Rationale: A polar bond occurs when electrons are shared
unequally between atoms, creating a dipole moment with partial
positive and negative charges.
4. The simplest form of carbohydrate, consisting of a single
sugar molecule, is called a __________.
- ANS: monosaccharide
- Rationale: A monosaccharide is the simplest form of
carbohydrate, consisting of a single sugar molecule such as
glucose or fructose.
True/False Questions
5. True or False: Enzymes are proteins that catalyze biochemical
reactions without being consumed in the process.
- ANS: True
- Rationale: Enzymes are biological catalysts that speed up
biochemical reactions without being consumed or permanently
altered.
6. True or False: In a chemical equilibrium, the concentrations of
reactants and products are equal.
- ANS: False
©/2025
