1|Page
Biol 320 Exam 3 Newest 2025/2026 Actual Exam
Complete Questions And 100%Correct
Answers(Verified And Graded A+)
Tight junctions found between the cells in our intestines
PREVENT
Small, non-polar molecules from using simple diffusion to
cross the plasma membrane
Membrane proteins from showing lateral movement
through the entire plasma membrane of a cell
The formation of a membrane domain
The tethering of proteins in the membrane to proteins in
the cytoskeleton
,2|Page
The import of glucose into intestinal cells - ANSWER-
Membrane proteins from showing lateral movement
through the entire plasma membrane of a cell
The voltage difference across a membrane is called:
Depolarization
The threshold potential
An action potential
The membrane potential - ANSWER-The membrane
potential
What is the difference between channels and
transporters?
,3|Page
Only transporters are selective in which solutes they
transport
Transporters are much faster at moving solutes than
channels
All transporters require ATP hydrolysis, while channels
perform passive diffusion
Transporters move very small solutes, while channels
move larger molecules
Only transporters specifically bind to their solutes in a
similar manner as an enzyme binds its substrate -
ANSWER-Only transporters specifically bind to their
solutes in a similar manner as an enzyme binds its
substrate
, 4|Page
If the sodium potassium pump stopped function in the
intestinal cells, which of the following would occur?
The sodium gradient would reach an equilibrium with the
intestinal lumen
the sodium inside the cell would decrease in concentration
glucose symport from the intestinal lumen would stop
the high glucose gradient in the cell would decrease -
ANSWER-The sodium gradient would reach an
equilibrium with the intestinal lumen
glucose symport from the intestinal lumen would stop
the high glucose gradient in the cell would decrease
Biol 320 Exam 3 Newest 2025/2026 Actual Exam
Complete Questions And 100%Correct
Answers(Verified And Graded A+)
Tight junctions found between the cells in our intestines
PREVENT
Small, non-polar molecules from using simple diffusion to
cross the plasma membrane
Membrane proteins from showing lateral movement
through the entire plasma membrane of a cell
The formation of a membrane domain
The tethering of proteins in the membrane to proteins in
the cytoskeleton
,2|Page
The import of glucose into intestinal cells - ANSWER-
Membrane proteins from showing lateral movement
through the entire plasma membrane of a cell
The voltage difference across a membrane is called:
Depolarization
The threshold potential
An action potential
The membrane potential - ANSWER-The membrane
potential
What is the difference between channels and
transporters?
,3|Page
Only transporters are selective in which solutes they
transport
Transporters are much faster at moving solutes than
channels
All transporters require ATP hydrolysis, while channels
perform passive diffusion
Transporters move very small solutes, while channels
move larger molecules
Only transporters specifically bind to their solutes in a
similar manner as an enzyme binds its substrate -
ANSWER-Only transporters specifically bind to their
solutes in a similar manner as an enzyme binds its
substrate
, 4|Page
If the sodium potassium pump stopped function in the
intestinal cells, which of the following would occur?
The sodium gradient would reach an equilibrium with the
intestinal lumen
the sodium inside the cell would decrease in concentration
glucose symport from the intestinal lumen would stop
the high glucose gradient in the cell would decrease -
ANSWER-The sodium gradient would reach an
equilibrium with the intestinal lumen
glucose symport from the intestinal lumen would stop
the high glucose gradient in the cell would decrease
