Biology Unit 2 Progress Check: FRQ
with verified solutions
The response indicates that substance L most likely crosses the membrane by active transport.
The response indicates that the cells maintain an intracellular concentration of 120 mM, which
is always greater than the concentration of substance L in the culture medium. - correct answer
✔✔(a) Identify the most likely mode of transport across the membrane for substance L. Explain
how information provided helps determine the most likely mode of transport.
/ - correct answer ✔✔(b) On the axes provided, construct an appropriately labeled line graph
with correct scale and units to illustrate the data in Table 1.
The response indicates that the external concentration of substance L that will result in one-half
of the maximal entry rate is between 31 mM and 34 mM - correct answer ✔✔(c) Determine the
external concentration of substance L that will result in one-half of the maximal entry rate.
The response indicates that substance L will be unable to enter the cells if it is attached to a
large protein OR the response indicates that substance L will be unable to enter the cells if it is
attached to a large protein unless there is a specific cell membrane receptor for the protein. -
correct answer ✔✔(d) Predict the likely effect on the ability of substance L to enter the cells if
substance L is attached to a large protein instead of free in the culture.
The response indicates that a cell membrane separates the internal environment of the cell
from the external environment OR that a cell membrane that is selectively permeable can help
to regulate what molecules move between the differing environments inside and outside of a
cell. - correct answer ✔✔(a) Describe the biological need for cells to be surrounded by a
membrane that is selectively permeable for different materials.
with verified solutions
The response indicates that substance L most likely crosses the membrane by active transport.
The response indicates that the cells maintain an intracellular concentration of 120 mM, which
is always greater than the concentration of substance L in the culture medium. - correct answer
✔✔(a) Identify the most likely mode of transport across the membrane for substance L. Explain
how information provided helps determine the most likely mode of transport.
/ - correct answer ✔✔(b) On the axes provided, construct an appropriately labeled line graph
with correct scale and units to illustrate the data in Table 1.
The response indicates that the external concentration of substance L that will result in one-half
of the maximal entry rate is between 31 mM and 34 mM - correct answer ✔✔(c) Determine the
external concentration of substance L that will result in one-half of the maximal entry rate.
The response indicates that substance L will be unable to enter the cells if it is attached to a
large protein OR the response indicates that substance L will be unable to enter the cells if it is
attached to a large protein unless there is a specific cell membrane receptor for the protein. -
correct answer ✔✔(d) Predict the likely effect on the ability of substance L to enter the cells if
substance L is attached to a large protein instead of free in the culture.
The response indicates that a cell membrane separates the internal environment of the cell
from the external environment OR that a cell membrane that is selectively permeable can help
to regulate what molecules move between the differing environments inside and outside of a
cell. - correct answer ✔✔(a) Describe the biological need for cells to be surrounded by a
membrane that is selectively permeable for different materials.
