Portage Learning BioChem 210 Final Exam: Ultimate Prep Bundle (2026 Updated) –
300+ Verified Q&A & Metabolic Pathway Guides
This all-inclusive study guide is meticulously designed for students taking the Portage
Learning BioChem 210 final exam. It features over 300 verified practice questions with
detailed rationales covering everything from the properties of carbon to the complex
steps of the urea cycle and oxidative phosphorylation. The guide includes visual
breakdowns of metabolic pathways and clear explanations for identifying functional
groups and protein structures. Fully updated for the 2025/2026 academic year, this
resource ensures you have the core knowledge and calculation skills needed to secure
an A on your proctored final.
Foundations & Water (1–10)
Which of the following describes a molecule that has both polar and non-polar
regions?
A) Hydrophilic
B) Hydrophobic
C) Amphipathic
D) Isomeric
C) Amphipathic
Rationale: Amphipathic molecules, like phospholipids, contain both water-
loving and water-fearing sections.
What is the pH of a solution with a hydrogen ion concentration
of
M?
A) 10
B) 7
, C) 4
D) 14
C) 4
Rationale: pH is calculated as the negative log of the hydrogen ion
concentration.
Which organelle is responsible for the sorting and packaging of proteins for secretion?
A) Smooth ER
B) Golgi Apparatus
C) Nucleolus
D) Peroxisome
B) Golgi Apparatus
Rationale: The Golgi acts as the "post office" of the cell, modifying and routing
proteins.
In a titration curve, the "buffering region" occurs:
A) At the very beginning of the titration.
B) At the equivalence point.
C) Around the pKa of the acid.
D) Only at pH 7.0.
C) Around the pKa of the acid.
Rationale: Buffers resist pH change most effectively when the pH is within
one unit of the pKa.
The primary force that drives the "hydrophobic effect" in protein folding is:
A) Hydrogen bonding between non-polar groups.
B) The increase in entropy of water molecules.
C) Ionic attraction.
D) Covalent stabilization.
B) The increase in entropy of water molecules.
Rationale: Disordered water molecules become more ordered around non-
polar solutes; folding the non-polar groups inside releases the water,
increasing total entropy.
Which type of non-covalent interaction is the weakest individual force?
A) Hydrogen bonds
, B) Ionic bonds
C) Van der Waals forces
D) Hydrophobic interactions
C) Van der Waals forces
Rationale: These are transient, induced dipole interactions and are the
weakest per individual occurrence.
Prokaryotic cells differ from Eukaryotic cells because they lack:
A) A plasma membrane.
B) Ribosomes.
C) Membrane-bound organelles.
D) DNA.
C) Membrane-bound organelles.
Rationale: Prokaryotes (bacteria) do not have a nucleus or mitochondria.
If a reaction has a negative
(Gibbs Free Energy), the reaction is:
A) Endergonic and non-spontaneous.
B) Exergonic and spontaneous.
C) At equilibrium.
D) Consuming heat from the environment.
B) Exergonic and spontaneous.
Rationale: Negative
means energy is released and the reaction can proceed without added
energy.
Which functional group is characterized by a carbon double-bonded to an oxygen and
single-bonded to a hydroxyl group?
A) Carbonyl
B) Carboxyl
C) Hydroxyl
D) Amino
B) Carboxyl
, Rationale: The carboxyl group (-COOH) is the defining feature of organic
acids.
Water has a high specific heat because:
A) It is a small molecule.
B) It can form four hydrogen bonds per molecule.
C) It has a linear shape.
D) It is non-polar.
B) It can form four hydrogen bonds per molecule.
Rationale: Extensive hydrogen bonding requires significant energy to break
before temperature rises.
Amino Acids & Proteins (11–20)
Which amino acid has a thiol (-SH) group and can form disulfide bridges?
A) Methionine
B) Serine
C) Cysteine
D) Tyrosine
C) Cysteine
Rationale: Cysteine's sulfhydryl group allows it to form covalent disulfide
bonds, stabilizing tertiary structure.
The sequence of amino acids in a polypeptide chain is called the:
A) Primary structure.
B) Secondary structure.
C) Tertiary structure.
D) Quaternary structure.
A) Primary structure.
Rationale: Primary structure is the linear order of amino acids.
At a pH of 7.0, the amino group of an amino acid is typically:
A) Neutral.
B) Negatively charged.
C) Positively charged (protonated).
D) Deprotonated.
C) Positively charged (protonated).
300+ Verified Q&A & Metabolic Pathway Guides
This all-inclusive study guide is meticulously designed for students taking the Portage
Learning BioChem 210 final exam. It features over 300 verified practice questions with
detailed rationales covering everything from the properties of carbon to the complex
steps of the urea cycle and oxidative phosphorylation. The guide includes visual
breakdowns of metabolic pathways and clear explanations for identifying functional
groups and protein structures. Fully updated for the 2025/2026 academic year, this
resource ensures you have the core knowledge and calculation skills needed to secure
an A on your proctored final.
Foundations & Water (1–10)
Which of the following describes a molecule that has both polar and non-polar
regions?
A) Hydrophilic
B) Hydrophobic
C) Amphipathic
D) Isomeric
C) Amphipathic
Rationale: Amphipathic molecules, like phospholipids, contain both water-
loving and water-fearing sections.
What is the pH of a solution with a hydrogen ion concentration
of
M?
A) 10
B) 7
, C) 4
D) 14
C) 4
Rationale: pH is calculated as the negative log of the hydrogen ion
concentration.
Which organelle is responsible for the sorting and packaging of proteins for secretion?
A) Smooth ER
B) Golgi Apparatus
C) Nucleolus
D) Peroxisome
B) Golgi Apparatus
Rationale: The Golgi acts as the "post office" of the cell, modifying and routing
proteins.
In a titration curve, the "buffering region" occurs:
A) At the very beginning of the titration.
B) At the equivalence point.
C) Around the pKa of the acid.
D) Only at pH 7.0.
C) Around the pKa of the acid.
Rationale: Buffers resist pH change most effectively when the pH is within
one unit of the pKa.
The primary force that drives the "hydrophobic effect" in protein folding is:
A) Hydrogen bonding between non-polar groups.
B) The increase in entropy of water molecules.
C) Ionic attraction.
D) Covalent stabilization.
B) The increase in entropy of water molecules.
Rationale: Disordered water molecules become more ordered around non-
polar solutes; folding the non-polar groups inside releases the water,
increasing total entropy.
Which type of non-covalent interaction is the weakest individual force?
A) Hydrogen bonds
, B) Ionic bonds
C) Van der Waals forces
D) Hydrophobic interactions
C) Van der Waals forces
Rationale: These are transient, induced dipole interactions and are the
weakest per individual occurrence.
Prokaryotic cells differ from Eukaryotic cells because they lack:
A) A plasma membrane.
B) Ribosomes.
C) Membrane-bound organelles.
D) DNA.
C) Membrane-bound organelles.
Rationale: Prokaryotes (bacteria) do not have a nucleus or mitochondria.
If a reaction has a negative
(Gibbs Free Energy), the reaction is:
A) Endergonic and non-spontaneous.
B) Exergonic and spontaneous.
C) At equilibrium.
D) Consuming heat from the environment.
B) Exergonic and spontaneous.
Rationale: Negative
means energy is released and the reaction can proceed without added
energy.
Which functional group is characterized by a carbon double-bonded to an oxygen and
single-bonded to a hydroxyl group?
A) Carbonyl
B) Carboxyl
C) Hydroxyl
D) Amino
B) Carboxyl
, Rationale: The carboxyl group (-COOH) is the defining feature of organic
acids.
Water has a high specific heat because:
A) It is a small molecule.
B) It can form four hydrogen bonds per molecule.
C) It has a linear shape.
D) It is non-polar.
B) It can form four hydrogen bonds per molecule.
Rationale: Extensive hydrogen bonding requires significant energy to break
before temperature rises.
Amino Acids & Proteins (11–20)
Which amino acid has a thiol (-SH) group and can form disulfide bridges?
A) Methionine
B) Serine
C) Cysteine
D) Tyrosine
C) Cysteine
Rationale: Cysteine's sulfhydryl group allows it to form covalent disulfide
bonds, stabilizing tertiary structure.
The sequence of amino acids in a polypeptide chain is called the:
A) Primary structure.
B) Secondary structure.
C) Tertiary structure.
D) Quaternary structure.
A) Primary structure.
Rationale: Primary structure is the linear order of amino acids.
At a pH of 7.0, the amino group of an amino acid is typically:
A) Neutral.
B) Negatively charged.
C) Positively charged (protonated).
D) Deprotonated.
C) Positively charged (protonated).
