CH 5 HOMEOSTASIS – HOJ EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
Controls what goes in and out of the cell - ANS What is the purpose of the cell membrane?
passive transport - ANS movement of molecules without the use of any chemical energy
(ATP)
diffusion - ANS simplest type of passive transport; it can happen with liquids (food coloring
spreading), solids (sugar dissolving), gas (fart spreading)
High to low concentration - ANS In which direction does the diffusion occur?
concentration gradient - ANS the difference in the concentration of a substance across a
distance
kinetic energy - ANS What supplies the energy for diffusion?
in motion - ANS Molecules are constantly _____, even at equilibrium (vibrating in place in a
solid)
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 6
, size, solubility, charge - ANS 3 things that determine if a molecule will be able to diffuse
across the membrane
solute & solvent - ANS Name 2 parts of a solution
hypotonic, hypertonic - ANS WATER tends to diffuse from _________ to __________
solutions
cell wall - ANS What structure on the outside of a plant cell keeps them from rupturing from
too much water?
turgor pressure - ANS plant cell central vacuole big; pressing up against cell wall
cytolysis - ANS animal cell gets big; can burst because of too much water entering them
osmosis - ANS Diffusion of water through a selectively permeable membrane
into cell - ANS Which way does the water move if the solutes outside of the cell is hypotonic
to the cytosol
out of cell - ANS Which way does the water move if the outside of the cell is hypertonic to
the cytosol
yes but at equal rates - ANS If the inside and outside of a cell are both isotonic and have
reached equilibrium, does water still move across the cell membrane?
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 6
QUESTIONS AND ANSWERS 2026
VERIFIED.
Controls what goes in and out of the cell - ANS What is the purpose of the cell membrane?
passive transport - ANS movement of molecules without the use of any chemical energy
(ATP)
diffusion - ANS simplest type of passive transport; it can happen with liquids (food coloring
spreading), solids (sugar dissolving), gas (fart spreading)
High to low concentration - ANS In which direction does the diffusion occur?
concentration gradient - ANS the difference in the concentration of a substance across a
distance
kinetic energy - ANS What supplies the energy for diffusion?
in motion - ANS Molecules are constantly _____, even at equilibrium (vibrating in place in a
solid)
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 6
, size, solubility, charge - ANS 3 things that determine if a molecule will be able to diffuse
across the membrane
solute & solvent - ANS Name 2 parts of a solution
hypotonic, hypertonic - ANS WATER tends to diffuse from _________ to __________
solutions
cell wall - ANS What structure on the outside of a plant cell keeps them from rupturing from
too much water?
turgor pressure - ANS plant cell central vacuole big; pressing up against cell wall
cytolysis - ANS animal cell gets big; can burst because of too much water entering them
osmosis - ANS Diffusion of water through a selectively permeable membrane
into cell - ANS Which way does the water move if the solutes outside of the cell is hypotonic
to the cytosol
out of cell - ANS Which way does the water move if the outside of the cell is hypertonic to
the cytosol
yes but at equal rates - ANS If the inside and outside of a cell are both isotonic and have
reached equilibrium, does water still move across the cell membrane?
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 6
