BioChem 210 Module 2 Exam - Portage Learning Latest Update 2026..
Part 1: Foundations & Water (Questions 1-30)
1. True or False: According to the Module, a compound with a molecular mass of
1,000 g/mol is considered a macromolecule.
A) True
B) False
Answer: B) False
Rationale: Macromolecules are generally very large, with molecular masses often
in the thousands or higher (e.g., proteins, DNA). However, the specific threshold
provided in the module is typically higher than 1,000 g/mol for a molecule to be
considered a 'macromolecule'.
2. Which of the following is an element NOT typically found in living organisms?
A) N
B) He
C) H
D) S
,Answer: B) He
Rationale: Living organisms are primarily composed of bulk elements like carbon,
hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Helium (He) is a noble gas
and is not found in biological molecules.
3. What is the most important molecule for energy storage in cells?
A) Creatine
B) DNA
C) ATP
D) RNA
Answer: C) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy currency of the
cell. It captures and transfers chemical energy for various cellular processes.
4. The following functional group is an example of a: (Image of a Ketone group)
A) Ketone
B) Thiol
C) Amide
D) Aldehyde
,Answer: A) Ketone
Rationale: A ketone functional group is characterized by a carbonyl group (C=O)
bonded to two other carbon atoms (R-CO-R').
5. In a eukaryotic cell, which organelle serves the purpose of digesting
macromolecules?
A) Peroxisomes
B) Lysosomes
C) Mitochondria
D) Golgi Apparatus
Answer: B) Lysosomes
Rationale: Lysosomes contain hydrolytic enzymes that break down (digest)
macromolecules, old cell parts, and foreign invaders. Peroxisomes break down
fatty acids and detoxify harmful substances like hydrogen peroxide.
6. Carbon dioxide has a linear molecular shape. What is its bond angle?
A) 109.5°
B) 104.5°
, C) 180°
D) 120°
Answer: C) 180°
Rationale: Carbon dioxide (O=C=O) is a linear molecule because the carbon atom
has no lone pairs of electrons and forms two double bonds, resulting in a bond
angle of 180 degrees.
7. Which of the following is NOT a property of carbon?
A) Forming covalent bonds
B) Possessing five valence electrons
C) Reacting to form long chains called polymers
D) Forming multiple bonds
Answer: B) Possessing five valence electrons
Rationale: Carbon has four valence electrons, allowing it to form four stable
covalent bonds, including single, double, and triple bonds. It does not possess five
valence electrons.
8. The pH of a 0.0010 M NaOH solution is:
Part 1: Foundations & Water (Questions 1-30)
1. True or False: According to the Module, a compound with a molecular mass of
1,000 g/mol is considered a macromolecule.
A) True
B) False
Answer: B) False
Rationale: Macromolecules are generally very large, with molecular masses often
in the thousands or higher (e.g., proteins, DNA). However, the specific threshold
provided in the module is typically higher than 1,000 g/mol for a molecule to be
considered a 'macromolecule'.
2. Which of the following is an element NOT typically found in living organisms?
A) N
B) He
C) H
D) S
,Answer: B) He
Rationale: Living organisms are primarily composed of bulk elements like carbon,
hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Helium (He) is a noble gas
and is not found in biological molecules.
3. What is the most important molecule for energy storage in cells?
A) Creatine
B) DNA
C) ATP
D) RNA
Answer: C) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy currency of the
cell. It captures and transfers chemical energy for various cellular processes.
4. The following functional group is an example of a: (Image of a Ketone group)
A) Ketone
B) Thiol
C) Amide
D) Aldehyde
,Answer: A) Ketone
Rationale: A ketone functional group is characterized by a carbonyl group (C=O)
bonded to two other carbon atoms (R-CO-R').
5. In a eukaryotic cell, which organelle serves the purpose of digesting
macromolecules?
A) Peroxisomes
B) Lysosomes
C) Mitochondria
D) Golgi Apparatus
Answer: B) Lysosomes
Rationale: Lysosomes contain hydrolytic enzymes that break down (digest)
macromolecules, old cell parts, and foreign invaders. Peroxisomes break down
fatty acids and detoxify harmful substances like hydrogen peroxide.
6. Carbon dioxide has a linear molecular shape. What is its bond angle?
A) 109.5°
B) 104.5°
, C) 180°
D) 120°
Answer: C) 180°
Rationale: Carbon dioxide (O=C=O) is a linear molecule because the carbon atom
has no lone pairs of electrons and forms two double bonds, resulting in a bond
angle of 180 degrees.
7. Which of the following is NOT a property of carbon?
A) Forming covalent bonds
B) Possessing five valence electrons
C) Reacting to form long chains called polymers
D) Forming multiple bonds
Answer: B) Possessing five valence electrons
Rationale: Carbon has four valence electrons, allowing it to form four stable
covalent bonds, including single, double, and triple bonds. It does not possess five
valence electrons.
8. The pH of a 0.0010 M NaOH solution is:
