Straighterline Anatomy &
Physiology I Final Exam
2026-2027 | Verified Q&A | 100%
Correct | Grade A | Pass
Guaranteed
ART A – MULTIPLE CHOICE (Q1–80)
P
Q1 (Basic Chemistry – Atomic Structure): Which subatomic particle is responsible for the
chemical identity of an element?
A) Neutron
B) Proton
C) Electron
D) Isotope
[CORRECT] B
Rationale: The number of protons (atomic number) determines the chemical identity of an
element; each element has a unique proton count. Neutrons only affect atomic mass, not
identity, and electrons can be gained or lost in chemical reactions without changing the element.
For Straighterline exams, always remember: proton number = atomic number = element identity.
Q2 (Basic Chemistry – Chemical Bonds): Which type of bond involves the sharing of electron
pairs between atoms?
A) Ionic bond
B) Hydrogen bond
C) Covalent bond
D) Van der Waals interaction
[CORRECT] C
Rationale: Covalent bonds form when atoms share electron pairs to achieve stable electron
configurations, as seen in molecules like H₂O and CO₂. Ionic bonds involve electron transfer, not
sharing, and hydrogen bonds are intermolecular attractions between polar molecules.
Straighterline frequently tests bond types—remember "coVALent = VALence electrons shared."
Q3 (Basic Chemistry – pH & Buffers): A buffer system in blood that resists pH changes consists
of:
A) HCl and NaOH
B) H₂CO₃ and HCO₃⁻
, ) NaCl and KCl
C
D) H₂O and OH⁻
[CORRECT] B
Rationale: The bicarbonate buffer system (carbonic acid H₂CO₃ and bicarbonate HCO₃⁻) is the
primary blood buffer that maintains pH between 7.35-7.45 by neutralizing excess acid or base.
HCl/NaOH would create extreme pH changes, not buffer against them. On Straighterline exams,
the bicarbonate buffer is the most commonly tested physiological buffer system.
Q4 (Basic Chemistry – Macromolecules): Which macromolecule is composed of amino acid
monomers linked by peptide bonds?
A) Carbohydrate
B) Lipid
C) Protein
D) Nucleic acid
[CORRECT] C
Rationale: Proteins are polymers of amino acids connected by peptide bonds formed via
dehydration synthesis between carboxyl and amino groups. Carbohydrates use glycosidic
bonds, lipids are not true polymers, and nucleic acids use phosphodiester bonds. Straighterline
tip: "pepTIDE bonds link amino acids into polypepTIDE chains."
Q5 (Cell Biology – Organelles): Which organelle is responsible for protein synthesis and is often
called the "protein factory" of the cell?
A) Golgi apparatus
B) Lysosome
C) Ribosome
D) Peroxisome
[CORRECT] C
Rationale: Ribosomes read mRNA and assemble amino acids into polypeptide chains during
translation, making them the primary protein synthesis sites. The Golgi apparatus modifies and
packages proteins but does not synthesize them. Straighterline frequently contrasts ribosomes
(synthesis) with Golgi (modification)—know which does which.
Q6 (Cell Biology – Membrane Transport): Which transport mechanism moves glucose into most
body cells against its concentration gradient?
A) Simple diffusion
B) Facilitated diffusion
C) Active transport (secondary)
D) Osmosis
[CORRECT] C
Rationale: Glucose enters most cells via secondary active transport (SGLT transporters) or
facilitated diffusion (GLUT transporters), but in the intestine and kidney tubules, it is actively
transported against gradients via sodium-glucose cotransport. Simple diffusion and osmosis are
passive and cannot move substances against gradients. Straighterline tests the distinction
between active vs. passive transport extensively.
Q7 (Cell Biology – Membrane Transport): A red blood cell placed in a hypotonic solution will:
A) Shrink (crenate)
B) Swell and potentially burst (lyse)
, ) Remain unchanged
C
D) Become isotonic
[CORRECT] B
Rationale: In a hypotonic solution, water moves by osmosis into the cell (where solute
concentration is higher), causing the cell to swell and potentially undergo hemolysis (bursting).
Crenation occurs in hypertonic solutions. Straighterline tip: HYPERtonic = cell shrinks (water
leaves); HYPOtonic = cell swells (water enters); ISOtonic = no change.
Q8 (Cell Biology – Mitosis): During which phase of mitosis do the chromosomes align at the
metaphase plate?
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
[CORRECT] B
Rationale: In metaphase, chromosomes line up at the cell's equatorial plane (metaphase plate)
due to spindle fiber attachment at kinetochores. Prophase involves chromatin condensation,
anaphase separates sister chromatids, and telophase reforms nuclear envelopes. Straighterline
mnemonic: "Metaphase = Middle alignment."
Q9 (Cell Biology – Mitosis): Which phase of the cell cycle is characterized by DNA replication?
A) G₁ phase
B) S phase
C) G₂ phase
D) M phase
[CORRECT] B
Rationale: The S (synthesis) phase is when DNA replication occurs, doubling the genetic
material before cell division. G₁ is growth and preparation, G₂ is further growth and checkpoint
verification, and M phase is mitosis itself. Straighterline frequently tests cell cycle order: G₁ → S
→ G₂ → M.
Q10 (Cell Biology – Protein Synthesis): Where does translation occur in the cell?
A) Nucleus
B) Ribosome
C) Golgi apparatus
D) Smooth endoplasmic reticulum
[CORRECT] B
Rationale: Translation (protein synthesis from mRNA) occurs at ribosomes, which may be free
in cytoplasm or bound to rough ER. Transcription (DNA → mRNA) occurs in the nucleus.
Straighterline tests the central dogma: DNA → RNA (transcription in nucleus) → Protein
(translation at ribosome).
Q11 (Histology – Epithelial Tissue): Which epithelial tissue type is best suited for rapid diffusion
and filtration?
A) Stratified squamous
B) Simple squamous
C) Simple cuboidal
D) Pseudostratified columnar
Physiology I Final Exam
2026-2027 | Verified Q&A | 100%
Correct | Grade A | Pass
Guaranteed
ART A – MULTIPLE CHOICE (Q1–80)
P
Q1 (Basic Chemistry – Atomic Structure): Which subatomic particle is responsible for the
chemical identity of an element?
A) Neutron
B) Proton
C) Electron
D) Isotope
[CORRECT] B
Rationale: The number of protons (atomic number) determines the chemical identity of an
element; each element has a unique proton count. Neutrons only affect atomic mass, not
identity, and electrons can be gained or lost in chemical reactions without changing the element.
For Straighterline exams, always remember: proton number = atomic number = element identity.
Q2 (Basic Chemistry – Chemical Bonds): Which type of bond involves the sharing of electron
pairs between atoms?
A) Ionic bond
B) Hydrogen bond
C) Covalent bond
D) Van der Waals interaction
[CORRECT] C
Rationale: Covalent bonds form when atoms share electron pairs to achieve stable electron
configurations, as seen in molecules like H₂O and CO₂. Ionic bonds involve electron transfer, not
sharing, and hydrogen bonds are intermolecular attractions between polar molecules.
Straighterline frequently tests bond types—remember "coVALent = VALence electrons shared."
Q3 (Basic Chemistry – pH & Buffers): A buffer system in blood that resists pH changes consists
of:
A) HCl and NaOH
B) H₂CO₃ and HCO₃⁻
, ) NaCl and KCl
C
D) H₂O and OH⁻
[CORRECT] B
Rationale: The bicarbonate buffer system (carbonic acid H₂CO₃ and bicarbonate HCO₃⁻) is the
primary blood buffer that maintains pH between 7.35-7.45 by neutralizing excess acid or base.
HCl/NaOH would create extreme pH changes, not buffer against them. On Straighterline exams,
the bicarbonate buffer is the most commonly tested physiological buffer system.
Q4 (Basic Chemistry – Macromolecules): Which macromolecule is composed of amino acid
monomers linked by peptide bonds?
A) Carbohydrate
B) Lipid
C) Protein
D) Nucleic acid
[CORRECT] C
Rationale: Proteins are polymers of amino acids connected by peptide bonds formed via
dehydration synthesis between carboxyl and amino groups. Carbohydrates use glycosidic
bonds, lipids are not true polymers, and nucleic acids use phosphodiester bonds. Straighterline
tip: "pepTIDE bonds link amino acids into polypepTIDE chains."
Q5 (Cell Biology – Organelles): Which organelle is responsible for protein synthesis and is often
called the "protein factory" of the cell?
A) Golgi apparatus
B) Lysosome
C) Ribosome
D) Peroxisome
[CORRECT] C
Rationale: Ribosomes read mRNA and assemble amino acids into polypeptide chains during
translation, making them the primary protein synthesis sites. The Golgi apparatus modifies and
packages proteins but does not synthesize them. Straighterline frequently contrasts ribosomes
(synthesis) with Golgi (modification)—know which does which.
Q6 (Cell Biology – Membrane Transport): Which transport mechanism moves glucose into most
body cells against its concentration gradient?
A) Simple diffusion
B) Facilitated diffusion
C) Active transport (secondary)
D) Osmosis
[CORRECT] C
Rationale: Glucose enters most cells via secondary active transport (SGLT transporters) or
facilitated diffusion (GLUT transporters), but in the intestine and kidney tubules, it is actively
transported against gradients via sodium-glucose cotransport. Simple diffusion and osmosis are
passive and cannot move substances against gradients. Straighterline tests the distinction
between active vs. passive transport extensively.
Q7 (Cell Biology – Membrane Transport): A red blood cell placed in a hypotonic solution will:
A) Shrink (crenate)
B) Swell and potentially burst (lyse)
, ) Remain unchanged
C
D) Become isotonic
[CORRECT] B
Rationale: In a hypotonic solution, water moves by osmosis into the cell (where solute
concentration is higher), causing the cell to swell and potentially undergo hemolysis (bursting).
Crenation occurs in hypertonic solutions. Straighterline tip: HYPERtonic = cell shrinks (water
leaves); HYPOtonic = cell swells (water enters); ISOtonic = no change.
Q8 (Cell Biology – Mitosis): During which phase of mitosis do the chromosomes align at the
metaphase plate?
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
[CORRECT] B
Rationale: In metaphase, chromosomes line up at the cell's equatorial plane (metaphase plate)
due to spindle fiber attachment at kinetochores. Prophase involves chromatin condensation,
anaphase separates sister chromatids, and telophase reforms nuclear envelopes. Straighterline
mnemonic: "Metaphase = Middle alignment."
Q9 (Cell Biology – Mitosis): Which phase of the cell cycle is characterized by DNA replication?
A) G₁ phase
B) S phase
C) G₂ phase
D) M phase
[CORRECT] B
Rationale: The S (synthesis) phase is when DNA replication occurs, doubling the genetic
material before cell division. G₁ is growth and preparation, G₂ is further growth and checkpoint
verification, and M phase is mitosis itself. Straighterline frequently tests cell cycle order: G₁ → S
→ G₂ → M.
Q10 (Cell Biology – Protein Synthesis): Where does translation occur in the cell?
A) Nucleus
B) Ribosome
C) Golgi apparatus
D) Smooth endoplasmic reticulum
[CORRECT] B
Rationale: Translation (protein synthesis from mRNA) occurs at ribosomes, which may be free
in cytoplasm or bound to rough ER. Transcription (DNA → mRNA) occurs in the nucleus.
Straighterline tests the central dogma: DNA → RNA (transcription in nucleus) → Protein
(translation at ribosome).
Q11 (Histology – Epithelial Tissue): Which epithelial tissue type is best suited for rapid diffusion
and filtration?
A) Stratified squamous
B) Simple squamous
C) Simple cuboidal
D) Pseudostratified columnar
