Multiple Choice Quiz

Please answer all questions


1	The rate of diffusion of a molecule into a cell membrane is increased by
		A)	decreasing the temperature.
		B)	increasing the concentration of the molecule inside the cell.
		C)	increasing the surface area of the cell.
		D)	decreasing the permeability of the membrane to the molecule.


2	Diffusion
		A)	requires the hydrolysis of ATP.
		B)	moves molecules against a concentration gradient.
		C)	always requires the use of carrier proteins.
		D)	is a passive process.


3	Osmosis
		A)	is the diffusion of water.
		B)	requires a membrane permeable to solutes.
		C)	requires a transport protein.
		D)	none of the above.


4	A three molar solution contains
		A)	6.02 X 1023 molecules
		B)	12.04 X 1023 molecules
		C)	18.06 X 1023 molecules
		D)	none of the above.


5	A 2 M solution of a compound that dissociates into two particles would be equal to
		A)	1 Osm.
		B)	2 Osm.
		C)	3 Osm.
		D)	4 Osm.


6	The volume of a red blood cell placed in a 0.9 Osm saline solution will
		A)	increase.
		B)	decrease.
		C)	not change.
		D)	it is impossible to determine with the information presented.


7	The type of solution which would stimulate an increased secretion of antidiuretic hormone would cause red blood cells to
		A)	crenate.
		B)	lyse.
		C)	remain unchanged.
		D)	it is impossible to determine with the information presented.


8	Glucose movement into skeletal muscle occurs through
		A)	active transport.
		B)	facilitated diffusion.
		C)	osmosis.
		D)	simple diffusion.


9	Secondary active transport
		A)	directly utilizes ATP.
		B)	does not demonstrate saturation kinetics.
		C)	usually involves coupled transport.
		D)	none of the above.


10	The sodium-potassium pump
		A)	is an example of secondary active transport.
		B)	transports sodium ions into the cell.
		C)	transports potassium ions into the cell.
		D)	transports an equal number of sodium and potassium ions across the cell membrane.


11	The membrane potential of a cell is
		A)	due to unequal permeability of the cell membrane to different ions.
		B)	usually positive with respect to the extracellular fluid.
		C)	constant and not subject to change.
		D)	all of the above.


12	If the intracellular concentration of Ca2⁺ is 150 mEq/L and the extracellular concentration of Ca2⁺ is 50 mEq/l, the equilibrium potential for Ca2⁺ would be
		A)	14.6 mV.
		B)	29.2 mV.
		C)	-29.2 mV.
		D)	-14.6 mV.


13	Poisoning the sodium-potassium pump would most likely result in
		A)	a more positive resting membrane potential.
		B)	a more negative resting membrane potential.
		C)	no change in the resting membrane potential.
		D)	an increase in intracellular calcium ions.

2002 McGraw-Hill Higher Education
Any use is subject to the Terms of Use and Privacy Notice.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.