PHYS 261 LAB FINAL STUDY GUIDE QUESTIONS
AND CORRECT DETAILED ANSWERS WITH
COMPLETE SOLUTIONS | NEW VERSION 2026
The plasma membrane not only provides a protective boundary for the cell but
also determines which substances enter or exit the cell. We call this characteristic:
a. diffusion
b. membrane potential
c. osmosis
d. selective permeability - ANSWERS d. selective permeability
A passive process, (diffusion/osmosis) is the movement of solute molecules from
an area of greater concentration to an area of lesser concentration. - ANSWERS
diffusion
A solution surrounding a cell is "hypertonic" if:
a. it contains fewer nonpenetrating solute particles than the interior of the cell
b. it contains more nonpenetrating solute particles than the interior of the cell
c. it contains the same amount of nonpenetrating solute particles as the interior
of the cell - ANSWERS b. it contains more non penetrating solute particles
than the interior of the cell
which of the following would require an input of energy?
a. diffusion
,b. filtration
c. osmosis
d. vesicular transport - ANSWERS d. vesicular transport
Circle the correct underlined term. In pinocytosis / phagocytosis, parts of the
plasma membrane and cytoplasm extend and engulf a relatively large or solid
material. - ANSWERS phagocytosis
Circle the correct underlined term. In active / passive processes, the cell provides
energy in the form of ATP to power the transport process. - ANSWERS active
active processes - ANSWERS cell provides energy (ATP) to power the transport
process.
passive processes - ANSWERS concentration or pressure differences drive the
movement.
The two important passive processes of membrane transport are - ANSWERS
diffusionand filtration.
he movement of molecules from a region of their higher concentration to a region
of their lower concentration. - ANSWERS Diffusion
The unassisted diffusion of solutes (dissolved substances) through a selectively
permeable membrane is called - ANSWERS simple diffusion.
CO2 and O2
, transported across the plasma membrane with the assistance of a protein carrier
molecule. - ANSWERS facilitated diffusion
ex: glucose
The flow of water across a selectively permeable membrane is called -
ANSWERS osmosis
During osmosis, water moves ____ its concentration gradient. - ANSWERS
down
A solution surrounding a cell is ______ if it contains more nonpenetrating solute
particles than the interior of the cell.
Water moves from the interior of the cell into a surrounding ______ solution by
osmosis. - ANSWERS hypertonic
A solution surrounding a cell is _______ if it contains fewer nonpenetrating solute
particles than the interior of the cell.
Water moves from a _____ solution into the cell by osmosis. - ANSWERS
hypotonic
a concentration of nonpenetrating solutes (e.g., proteins and some ions) equal to
that in the cells (same solute/water concentration) - ANSWERS isotonic
The red blood cells burst as the water floods into them, leaving "ghosts" in their
wake—a phenomenon called - ANSWERS hemolysis
AND CORRECT DETAILED ANSWERS WITH
COMPLETE SOLUTIONS | NEW VERSION 2026
The plasma membrane not only provides a protective boundary for the cell but
also determines which substances enter or exit the cell. We call this characteristic:
a. diffusion
b. membrane potential
c. osmosis
d. selective permeability - ANSWERS d. selective permeability
A passive process, (diffusion/osmosis) is the movement of solute molecules from
an area of greater concentration to an area of lesser concentration. - ANSWERS
diffusion
A solution surrounding a cell is "hypertonic" if:
a. it contains fewer nonpenetrating solute particles than the interior of the cell
b. it contains more nonpenetrating solute particles than the interior of the cell
c. it contains the same amount of nonpenetrating solute particles as the interior
of the cell - ANSWERS b. it contains more non penetrating solute particles
than the interior of the cell
which of the following would require an input of energy?
a. diffusion
,b. filtration
c. osmosis
d. vesicular transport - ANSWERS d. vesicular transport
Circle the correct underlined term. In pinocytosis / phagocytosis, parts of the
plasma membrane and cytoplasm extend and engulf a relatively large or solid
material. - ANSWERS phagocytosis
Circle the correct underlined term. In active / passive processes, the cell provides
energy in the form of ATP to power the transport process. - ANSWERS active
active processes - ANSWERS cell provides energy (ATP) to power the transport
process.
passive processes - ANSWERS concentration or pressure differences drive the
movement.
The two important passive processes of membrane transport are - ANSWERS
diffusionand filtration.
he movement of molecules from a region of their higher concentration to a region
of their lower concentration. - ANSWERS Diffusion
The unassisted diffusion of solutes (dissolved substances) through a selectively
permeable membrane is called - ANSWERS simple diffusion.
CO2 and O2
, transported across the plasma membrane with the assistance of a protein carrier
molecule. - ANSWERS facilitated diffusion
ex: glucose
The flow of water across a selectively permeable membrane is called -
ANSWERS osmosis
During osmosis, water moves ____ its concentration gradient. - ANSWERS
down
A solution surrounding a cell is ______ if it contains more nonpenetrating solute
particles than the interior of the cell.
Water moves from the interior of the cell into a surrounding ______ solution by
osmosis. - ANSWERS hypertonic
A solution surrounding a cell is _______ if it contains fewer nonpenetrating solute
particles than the interior of the cell.
Water moves from a _____ solution into the cell by osmosis. - ANSWERS
hypotonic
a concentration of nonpenetrating solutes (e.g., proteins and some ions) equal to
that in the cells (same solute/water concentration) - ANSWERS isotonic
The red blood cells burst as the water floods into them, leaving "ghosts" in their
wake—a phenomenon called - ANSWERS hemolysis
