BIO 150 Exam 3 Hyman QUESTIONS WITH
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ANSWERS
|\
What is osmosis? - CORRECT ANSWERS ✔✔Passive
|\ |\ |\ |\ |\ |\ |\
movement of water across a cell membrane to balance
|\ |\ |\ |\ |\ |\ |\ |\ |\
the concentrations of solutions inside and outside of a cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
|
Movement of water from a low concentration of solute to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
a high concentration of solute
|\ |\ |\ |\
What is a hypertonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution will a relatively high concentration of solutes
|\ |\ |\ |\ |\ |\ |\ |\
dissolved in it |\ |\ |\
,Water rushes OUT of the cell from a low solute
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
concentration to a high concentration causing the cell to |\ |\ |\ |\ |\ |\ |\ |\ |\
shrink (crenation) |\
- Ex. saltwater is typically hypertonic relative to the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
What is a hypotonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution will a relatively low concentration of solutes
|\ |\ |\ |\ |\ |\ |\ |\
dissolved in it |\ |\
Water rushes INTO the cell from a low solute
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration to a high solute concentration causing the |\ |\ |\ |\ |\ |\ |\ |\
cell to passively burst (lysis)
|\ |\ |\ |\
- Ex. freshwater is typically hypotonic relative to the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
T or F: Red blood cells in humans will implode (shrink too
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
much) if blood becomes too dilute (aka loses too many
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
salts). - CORRECT ANSWERS ✔✔False
|\ |\ |\ |\ |\
- will cause the cell to explode
|\ |\ |\ |\ |\ |\
What is an isotonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution with relatively equal concentrations of solute in it
|\ |\ |\ |\ |\ |\ |\ |\
The amount of water transported in is equal to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
amount of water transported out |\ |\ |\ |\ |\
,Ex. animal cells
|\ |\
Why is it ideal for animal cells to be in an isotonic
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
environment? - CORRECT ANSWERS ✔✔animal cells do |\ |\ |\ |\ |\ |\ |\
not have a cell wall nor contractile vacuoles
|\ |\ |\ |\ |\ |\ |\ |\
a cell wall prevents the plasma membrane from
|\ |\ |\ |\ |\ |\ |\ |\
expanding and bursting easily when placed in a hypotonic |\ |\ |\ |\ |\ |\ |\ |\
environment
|\ |\
contractile vacuoles pump excess water out of the cell |\ |\ |\ |\ |\ |\ |\ |\
What is important about cell membranes in regards to
|\ |\ |\ |\ |\ |\ |\ |\ |\
diffusion? - CORRECT ANSWERS ✔✔Solute either can or
|\ |\ |\ |\ |\ |\ |\ |\
can't cross the cell membrane, BUT water can cross via
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
osmosis
What is important about cell walls in regards to diffusion?
|\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔Prokaryotes, unicellular algae
|\ |\ |\ |\ |\ |\ |\
(Eukarya), plants, and fungi have a cell wall that keeps|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the plasma membrane from expanding and bursting
|\ |\ |\ |\ |\ |\ |\
- acts like spandex for a cell
|\ |\ |\ |\ |\ |\
What is important about ION channels? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔WATER FOLLOWS IONS |\ |\ |\
, - They pump ions INTO the cell when in saltwater to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
prevent crenation |\
- They pump ions OUT of the cell in freshwater to prevent
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
lysis
T or F: In saltwater environments some unicellular
|\ |\ |\ |\ |\ |\ |\ |\
organisms use ion channels to pump ions OUT OF cells to |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
make the environment |\ |\
isotonic relative to the cellular fluid - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔False
- this will not make the environment isotonic
|\ |\ |\ |\ |\ |\ |\
What is a protist? - CORRECT ANSWERS ✔✔a unicellular
|\ |\ |\ |\ |\ |\ |\ |\ |\
eukaryote that cannot be classified as an animal, plant, |\ |\ |\ |\ |\ |\ |\ |\ |\
fungi, or bacteria |\ |\
What is a prokaryote? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\
unicellular organism that lacks a nucleus and membrane |\ |\ |\ |\ |\ |\ |\ |\
bound organelles |\
What are contractile vacuoles? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔Compartments that take up excess water inside the |\ |\ |\ |\ |\ |\ |\ |\
cell and contract to expel it outside the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
- Ex. unicellular eukarya have contractile vacuoles
|\ |\ |\ |\ |\ |\
|\ |\ |\ |\ |\ |\
ANSWERS
|\
What is osmosis? - CORRECT ANSWERS ✔✔Passive
|\ |\ |\ |\ |\ |\ |\
movement of water across a cell membrane to balance
|\ |\ |\ |\ |\ |\ |\ |\ |\
the concentrations of solutions inside and outside of a cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
|
Movement of water from a low concentration of solute to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
a high concentration of solute
|\ |\ |\ |\
What is a hypertonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution will a relatively high concentration of solutes
|\ |\ |\ |\ |\ |\ |\ |\
dissolved in it |\ |\ |\
,Water rushes OUT of the cell from a low solute
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
concentration to a high concentration causing the cell to |\ |\ |\ |\ |\ |\ |\ |\ |\
shrink (crenation) |\
- Ex. saltwater is typically hypertonic relative to the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
What is a hypotonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution will a relatively low concentration of solutes
|\ |\ |\ |\ |\ |\ |\ |\
dissolved in it |\ |\
Water rushes INTO the cell from a low solute
|\ |\ |\ |\ |\ |\ |\ |\ |\
concentration to a high solute concentration causing the |\ |\ |\ |\ |\ |\ |\ |\
cell to passively burst (lysis)
|\ |\ |\ |\
- Ex. freshwater is typically hypotonic relative to the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
T or F: Red blood cells in humans will implode (shrink too
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
much) if blood becomes too dilute (aka loses too many
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
salts). - CORRECT ANSWERS ✔✔False
|\ |\ |\ |\ |\
- will cause the cell to explode
|\ |\ |\ |\ |\ |\
What is an isotonic solution? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\ |\
solution with relatively equal concentrations of solute in it
|\ |\ |\ |\ |\ |\ |\ |\
The amount of water transported in is equal to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
amount of water transported out |\ |\ |\ |\ |\
,Ex. animal cells
|\ |\
Why is it ideal for animal cells to be in an isotonic
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
environment? - CORRECT ANSWERS ✔✔animal cells do |\ |\ |\ |\ |\ |\ |\
not have a cell wall nor contractile vacuoles
|\ |\ |\ |\ |\ |\ |\ |\
a cell wall prevents the plasma membrane from
|\ |\ |\ |\ |\ |\ |\ |\
expanding and bursting easily when placed in a hypotonic |\ |\ |\ |\ |\ |\ |\ |\
environment
|\ |\
contractile vacuoles pump excess water out of the cell |\ |\ |\ |\ |\ |\ |\ |\
What is important about cell membranes in regards to
|\ |\ |\ |\ |\ |\ |\ |\ |\
diffusion? - CORRECT ANSWERS ✔✔Solute either can or
|\ |\ |\ |\ |\ |\ |\ |\
can't cross the cell membrane, BUT water can cross via
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
osmosis
What is important about cell walls in regards to diffusion?
|\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔Prokaryotes, unicellular algae
|\ |\ |\ |\ |\ |\ |\
(Eukarya), plants, and fungi have a cell wall that keeps|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the plasma membrane from expanding and bursting
|\ |\ |\ |\ |\ |\ |\
- acts like spandex for a cell
|\ |\ |\ |\ |\ |\
What is important about ION channels? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔WATER FOLLOWS IONS |\ |\ |\
, - They pump ions INTO the cell when in saltwater to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
prevent crenation |\
- They pump ions OUT of the cell in freshwater to prevent
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
lysis
T or F: In saltwater environments some unicellular
|\ |\ |\ |\ |\ |\ |\ |\
organisms use ion channels to pump ions OUT OF cells to |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
make the environment |\ |\
isotonic relative to the cellular fluid - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔False
- this will not make the environment isotonic
|\ |\ |\ |\ |\ |\ |\
What is a protist? - CORRECT ANSWERS ✔✔a unicellular
|\ |\ |\ |\ |\ |\ |\ |\ |\
eukaryote that cannot be classified as an animal, plant, |\ |\ |\ |\ |\ |\ |\ |\ |\
fungi, or bacteria |\ |\
What is a prokaryote? - CORRECT ANSWERS ✔✔A
|\ |\ |\ |\ |\ |\ |\ |\
unicellular organism that lacks a nucleus and membrane |\ |\ |\ |\ |\ |\ |\ |\
bound organelles |\
What are contractile vacuoles? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔Compartments that take up excess water inside the |\ |\ |\ |\ |\ |\ |\ |\
cell and contract to expel it outside the cell
|\ |\ |\ |\ |\ |\ |\ |\ |\
- Ex. unicellular eukarya have contractile vacuoles
|\ |\ |\ |\ |\ |\
