Plasma Membrane-BIOL-107
Plasma Membrane
Question 1
The basic ‘building blocks’ of plasma membranes are
Question 2
Phospholipids are
Amphipathic
hydrophobic
hydrophilic
Question 3
Why is the term “fluid mosaic model” used to describe a plasma membrane?
Because the proteins in the membrane are like tiles in a mosaic, the phospholipid looks like the grout used to hold the mosaic together, and the phospholipids have a fluid-like consistency at normal body temperature.
Because several types of cells usually occur together in organisms like tiles in a mosaic, and there is water in most cells’ environment
Question 4
The movement of molecules in solution from areas of high concentration to areas of lower concentration is diffusion.
True
False
Question 5
Which of these can diffuse through a plasma membrane? (all that apply)
CO2
small lipids
oxygen
Na+
DNA
sucrose
water
glucose
Question 6
Which of these must be transported through a plasma membrane? (all that apply)
sucrose
CO2
small lipids
DNA
Na+
glucose
Question 7
If a cell is placed in an environment in which there is a higher oxygen concentration outside the cell that inside the cell;
more oxygen molecules will enter the cell than leave the cell
there will be no change in oxygen concentration because oxygen cannot diffuse through the plasma membrane
more oxygen molecules will leave the cell than enter the cell
Question 8
Osmosis is the diffusion of water through a semi-permeable membrane.
True
False
Question 9
A plant cell with an internal solute concentration of 3% is placed in a solution with a solute concentration of 5%. Water will
flow into the cell
have no net flow
flow out of the cell
Question 10
A plant cell with an internal solute concentration of 3% is placed in a solution with a solute concentration of 5%. With respect to the interior of the cell, the surrounding solution is
isotonic
hypertonic
hypotonic
Question 11
A plant cell with an internal solute concentration of 3% is placed in a solution with a solute concentration of 5%. The cell will
become flaccid
burst
plasmolize
become turgid
Question 12
Cholesterol is present in animal cell membranes but not in plant cell membranes. It serves
as a hormone receptor
to make the membrane fluidity independent of environmental temperature
to store energy
as an antigen
Question 13
An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). Water will
flow out of the cell
experience no net flow
flow into the cell
Question 14
0.25 / 0.25 pts
An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). With respect to the interior of the cell, the surrounding solution is
hypertonic
isotonic
hypotonic
Question 15
An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). The cell will
become flaccid
become turgid
burst
plasmolize
Question 16
How are active transport and facilitated diffusion similar? (all that apply)
both require energy
both move molecules down the concentration gradient
both use transport proteins
both move the same kinds of molecules
Question 17
Active transport is different than facilitated diffusion because it
can move larger molecules
moves molecules down the concentration gradient
requires energy
transports only proteins
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