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18 questions
The plasma membrane is best described as ___________ permeable.
selectively permeable
completely permeable
impenetrable
unimportant
The plasma membrane helps to maintain ___________ in a cell.
homeostasis
imbalance
detrimental conditions
imperfect conditions
The _________________ model describes the structure of the plasma membrane.
fluid mosaic
double helix
Bohr
distribution
The majority of the plasma membrane is composed of a bilayer of ______.
phospholipids
proteins
carbohydrates
cholesterol
What property does the phospholipid bilayer give to a plasma membrane?
provides a barrier between the inside and outside of the cell
communicates between cells that are great distances apart
conducts electrical impulses in nerve cells
allows cells to bind to each other
Select all that apply.
Plasma membranes are composed of a bilayer of phospholipids with ________, _________, and ________ embedded within.
proteins
carbohydrates
DNA
cholesterol
What does A represent?
hydrophilic phosphate heads
hydrophobic phosphate heads
membrane proteins
cholesterol
What does D represent?
hydrophilic fatty acid tails
hydrophobic fatty acid tails
membrane proteins
cholesterol
What do E and F represent?
phosphlipids
carbohydrates
membrane proteins
cholesterol
What does C represent?
phosphlipids
carbohydrates
membrane proteins
cholesterol
What does G represent?
phosphlipids
carbohydrates
membrane proteins
cholesterol
Passive transport does not require ______ input from the cell.
energy
matter
reactant
solute
Passive movement of substances from high to low concentration.
diffusion
active transport
hydrolysis
endocytosis
During diffusion, substances move from high to low concentrations, or
down a concentration gradient.
up a concentration gradient.
_____________ diffusion can be used by the cell to move larger polar molecules and ions across the membrane.
Facilitated
Active
Complex
Emaciated
Facilitated diffusion requires a transport _________.
protein
carbohydrate
phospholipid
cholesterol
Facilitated diffusion is an example of passive transport because
substances move up a concentration gradient
substances move from low to high concentration
no energy is required
the cell uses ATP in the process
Diffusion will occur until ________ is reached and concentrations on both sides of the membrane are the same.
equilibrium
transport
gravity
solution
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