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20 questions
Identify cholesterol molecule
structure a
structure b
structure h
structure i
Identify a peripheral protein
structure a
strucure b
structure g
structure h
Plasma membranes are selectively permeable. This means
anything can pass in and out
the membrane regulates the passage of the material in and out of the cell
glucose cannot enter the cell
cholesterol cannot enter
Which is NOT a function of the membrane?
it forms a selective barrier
it has receptors for chemical messages
it is the control center of the cell
it is involved in self recognition
Small, nonpolar, hydrophobic molecules such as fatty acids
easily pass through the membrane's bilayer
very slowly diffuse through the bilayer
require transport proteins
enter through endocytosis
Membrane phospholipids
have hydrophobic heads that face the center of the membrane and are shielded from water
have hydrophilic tails that face outward
remain fluid because they are tightly packed
none of these
Which of the following substances would have the most trouble crossing the membrane by diffusing through the bilayer?
water
oxygen
carbon dioxide
a sodium ion
The cholesterol associated with membranes
is attached to proteins and extends into the environment surrounding the cell
helps stabilize the membrane at body temperature
is an abnormality resulting from a diet high in cholesterol
both a and c
When doctors perform organ transplants, they choose a donor tissue match. Which component is being matched?
membrane phospholipids
cytoskeleton
cell surface carbohydrates
cholesterol
What kinds of molecules pass through a cell membrane most easily?
ionic
small and hydrophobic
large polar
large and hydrophobic
Which of the following would likely move through the lipid bilayer most rapidly?
potassium
an amino acid
Carbon dioxide
glucose
Which of the following allows water to move faster across cell membranes?
aquaporins
ATP
peripheral proteins
the sodium-potassium pump
What is the "big idea" of the Fluid Mosaic Model of plasma membranes?
the plasma membrane creates a specialized FLUID that looks like a MOSAIC.
the plasma membrane is a MOSAIC.
the fluid mosaic model is NOT related to the plasma membrane.
a plasma membrane is a MOSAIC of components that move FREELY and FLUIDLY.
Describes the arrangement of the cell membrane as bendable and made of many parts.
the fluid mosaic model
the major mobility model
the crazy cell model
the cell theroy model
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