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BIOL 1P91 FINAL EXAM ACTUAL
2025/2026 QUESTIONS AND 100%
CORRECT ANSWERS
All of the following statements about membrane fluidity are true EXCEPT:
a. shorter fatty acid tails increase membrane fluidity
b. saturated fatty acid tails make the membrane more fluid
c. membrane fluidity is affected by the presence of double-bonds in the fatty acid
tails
d. at high temperatures, cholesterol makes the membrane less fluid -
(ANSWER)b. saturated fatty acid tails make the membrane more fluid
Why is Fe+ not able to move directly through the membrane?
a. it is amphipathic
b. it is non-polar
c. it is too large
d. it carries a charge
e. it does not contain carbon - (ANSWER)d. it carries a charge
A 0.9% NaCl solution is isotonic to red blood cells. If a red blood cell is placed in
4% NaCl, what will occur?
a. cell lysis
b. crenation
c. turgor pressure
,2
d. plasmolysis
e. nothing - (ANSWER)b. crenation
what is crenation? - (ANSWER)cell shrinkage (osmosis may promote this)
what type of transport protein can move two or more different molecules in
opposite directions?
a. antiporter
b. uniporter
c. diporter
d. symporter
e. multiporter - (ANSWER)a. antiporter
what is a antiporter? - (ANSWER)they bind two or more different types of ions or
molecules and transport them in opposite directions
What is turgor pressure? - (ANSWER)the internal water pressure generated in
plant cells as the cell membrane presses on. the cell wall.
what are uniporters? - (ANSWER)they bind a single molecule or ion and transport
it across the membrane
,3
what are symporters or co-transporters? - (ANSWER)bind two or more different
types of ions or molecules and transport them in the same direction
The cell transports Ca2+ from the cytosol (low Ca2+ concentration) into the ER
(high Ca2+ concentration). Which statement about this process is INCORRECT?
a. calcium movement involves active transport
b. calcium movement requires an input of energy
c. calcium movement occurs by facilitated diffusion
d. calcium movement occurs through a transmembrane protein - (ANSWER)c.
calcium movement occurs by facilitated diffusion.
What is facilitated diffusion? - (ANSWER)diffusion across a membrane with the
aid of transport proteins
a form of passive transport (does not require energy)
moves down, with no energy.
what is active transport? - (ANSWER)the movement of ions or molecules against
a concentration gradient using energy from ATP.
from low concentration to high concentration. Not energetically favourable
Primary active transport - (ANSWER)uses energy directly to transport a solute
against a concentration gradient
, 4
secondary active transport - (ANSWER)uses pre-existing gradient to drive the
active transport of another solute.
What is exocytosis? - (ANSWER)a process in which material inside the cell is
packaged into vesicles and excreted into the extracellular environment.
What is endocytosis? - (ANSWER)the plasma membrane folds inward to form a
vesicle that brings substances or particles into the cell.
Which of the following statements best describes the chemical composition of
biological membranes?
a. biological membranes are bilayers of proteins with associated lipids and
carbohydrates.
b. biological membranes are composed of two layers: one layer of phospholipids
and one layer of proteins.
c. biological membranes are bilayers of phospholipids with associated proteins
and carbohydrates.
d. biological membranes are composed of equal numbers of phospholipids,
proteins, and carbohydrates
e. biological membranes are composed of lipids with proteins attached to the
outer surface. - (ANSWER)
which of the following events in a biological membrane would not be
energetically favourable and therefore would not occur spontaneously?
a. the rotation of phospholipids
BIOL 1P91 FINAL EXAM ACTUAL
2025/2026 QUESTIONS AND 100%
CORRECT ANSWERS
All of the following statements about membrane fluidity are true EXCEPT:
a. shorter fatty acid tails increase membrane fluidity
b. saturated fatty acid tails make the membrane more fluid
c. membrane fluidity is affected by the presence of double-bonds in the fatty acid
tails
d. at high temperatures, cholesterol makes the membrane less fluid -
(ANSWER)b. saturated fatty acid tails make the membrane more fluid
Why is Fe+ not able to move directly through the membrane?
a. it is amphipathic
b. it is non-polar
c. it is too large
d. it carries a charge
e. it does not contain carbon - (ANSWER)d. it carries a charge
A 0.9% NaCl solution is isotonic to red blood cells. If a red blood cell is placed in
4% NaCl, what will occur?
a. cell lysis
b. crenation
c. turgor pressure
,2
d. plasmolysis
e. nothing - (ANSWER)b. crenation
what is crenation? - (ANSWER)cell shrinkage (osmosis may promote this)
what type of transport protein can move two or more different molecules in
opposite directions?
a. antiporter
b. uniporter
c. diporter
d. symporter
e. multiporter - (ANSWER)a. antiporter
what is a antiporter? - (ANSWER)they bind two or more different types of ions or
molecules and transport them in opposite directions
What is turgor pressure? - (ANSWER)the internal water pressure generated in
plant cells as the cell membrane presses on. the cell wall.
what are uniporters? - (ANSWER)they bind a single molecule or ion and transport
it across the membrane
,3
what are symporters or co-transporters? - (ANSWER)bind two or more different
types of ions or molecules and transport them in the same direction
The cell transports Ca2+ from the cytosol (low Ca2+ concentration) into the ER
(high Ca2+ concentration). Which statement about this process is INCORRECT?
a. calcium movement involves active transport
b. calcium movement requires an input of energy
c. calcium movement occurs by facilitated diffusion
d. calcium movement occurs through a transmembrane protein - (ANSWER)c.
calcium movement occurs by facilitated diffusion.
What is facilitated diffusion? - (ANSWER)diffusion across a membrane with the
aid of transport proteins
a form of passive transport (does not require energy)
moves down, with no energy.
what is active transport? - (ANSWER)the movement of ions or molecules against
a concentration gradient using energy from ATP.
from low concentration to high concentration. Not energetically favourable
Primary active transport - (ANSWER)uses energy directly to transport a solute
against a concentration gradient
, 4
secondary active transport - (ANSWER)uses pre-existing gradient to drive the
active transport of another solute.
What is exocytosis? - (ANSWER)a process in which material inside the cell is
packaged into vesicles and excreted into the extracellular environment.
What is endocytosis? - (ANSWER)the plasma membrane folds inward to form a
vesicle that brings substances or particles into the cell.
Which of the following statements best describes the chemical composition of
biological membranes?
a. biological membranes are bilayers of proteins with associated lipids and
carbohydrates.
b. biological membranes are composed of two layers: one layer of phospholipids
and one layer of proteins.
c. biological membranes are bilayers of phospholipids with associated proteins
and carbohydrates.
d. biological membranes are composed of equal numbers of phospholipids,
proteins, and carbohydrates
e. biological membranes are composed of lipids with proteins attached to the
outer surface. - (ANSWER)
which of the following events in a biological membrane would not be
energetically favourable and therefore would not occur spontaneously?
a. the rotation of phospholipids
