Exam (elaborations)
Bio 344 Quiz 2 Posner Questions answers latest update
- Course
- Bio 344
- Institution
- University Of Texas - Austin
Bio 344 Quiz 2 Posner Questions answers latest update
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Bio 344 Quiz 2 PosnerWhich of the following would you expect to diffuse fastest across a syntheitc
phospholipid bilayer?
a. Glucose (C6H12O6)
b. Na+ ions
c. Cl- ions
d. N2
e. all would diffuse at the same rate - N2
The direction in which an uncharged molecule is transported across the plasma
membrane of cell via facilitated diffusion is determined by:
a. the membrane potential of the cell
b. the relative concentrations of the molecule on the cytosolic and extracellular
sides of the cell
c. the ratio of saturated to unsaturated fatty acid chains in the two sides of the
lipid bilayer
, d. the energy produced by P-type pumps in the mitochondria
e. all of the above - the relative concentrations of the molecule on the cytosolic
and extracellular sides of the cell
Which of the following statements are true concerning protein transporters:
a. all carriers are multipass transmembrane proteins, while all channels are
peripheral membrane proteins
b. all channels are multipass transmembrane proteins, while all carriers are
peripheral membrane proteins
c. channel proteins are often used to transport charged ions against their
electrochemical gradient
d. all of the above
e. none of the above - none of the above
The region of the phopholipid bilayer that serves as the barrier that prevents
molecules from simply diffusing across is:
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