BIO 270 EXAM 1 JMU HYND
If red blood cells are placed in a(n) ____________________ solution,
water will enter the cells by osmosis. - ANSWERS--hypotonic
A(n) ____________________ solution has the same concentration of
non-penetrating solutes as normal body cells. - ANSWERS--isotonic
If solution A has a higher concentration of solute particles than
solution B and if these solutions are separated by a semipermeable
membrane, then there will be a net movement of water - ANSWERS--
into solution A because water moves from low concentration to high
concentration
____________________ act like "spot rivets" that anchor together
two adjacent but non-touching cells. - ANSWERS--desosomes
The tonicity of a solution refers to the effect that the ____. -
ANSWERS--solution has on cell volume when the solution surrounds
the cell
A more direct means of expressing solvent concentration is the
osmolarity of a solution, which is a measure of its total solvent
concentration given in terms of the mass of particles. (T/F) -
ANSWERS-False
, ____________________ exists when no net movement of any ions
takes place because all passive leaks are exactly balanced by active
pumping. - ANSWERS--steady state
In _______________ transport, energy is directly required to move a
substance _______________ its concentration gradient. - ANSWERS-
-active; against
Two ATP molecules could provide energy for a sodium-potassium
pump to move ____ ions out of the cell for every ____ ions it moves
into the cell. - ANSWERS--6Na+
-3K+
Gap junctions are especially abundant in what kind of tissue? -
ANSWERS--cardiac muscle
&
-smooth muscle
The rate at which substance "X" can diffuse through a plasma
membrane is inversely proportional to the - ANSWERS--molecular
weight of X
The greater the lipid solubility of a substance, the slower the
substance can diffuse through the membrane's lipid bilayer down its
concentration gradient. (T/F) - ANSWERS-False
If red blood cells are placed in a(n) ____________________ solution,
water will enter the cells by osmosis. - ANSWERS--hypotonic
A(n) ____________________ solution has the same concentration of
non-penetrating solutes as normal body cells. - ANSWERS--isotonic
If solution A has a higher concentration of solute particles than
solution B and if these solutions are separated by a semipermeable
membrane, then there will be a net movement of water - ANSWERS--
into solution A because water moves from low concentration to high
concentration
____________________ act like "spot rivets" that anchor together
two adjacent but non-touching cells. - ANSWERS--desosomes
The tonicity of a solution refers to the effect that the ____. -
ANSWERS--solution has on cell volume when the solution surrounds
the cell
A more direct means of expressing solvent concentration is the
osmolarity of a solution, which is a measure of its total solvent
concentration given in terms of the mass of particles. (T/F) -
ANSWERS-False
, ____________________ exists when no net movement of any ions
takes place because all passive leaks are exactly balanced by active
pumping. - ANSWERS--steady state
In _______________ transport, energy is directly required to move a
substance _______________ its concentration gradient. - ANSWERS-
-active; against
Two ATP molecules could provide energy for a sodium-potassium
pump to move ____ ions out of the cell for every ____ ions it moves
into the cell. - ANSWERS--6Na+
-3K+
Gap junctions are especially abundant in what kind of tissue? -
ANSWERS--cardiac muscle
&
-smooth muscle
The rate at which substance "X" can diffuse through a plasma
membrane is inversely proportional to the - ANSWERS--molecular
weight of X
The greater the lipid solubility of a substance, the slower the
substance can diffuse through the membrane's lipid bilayer down its
concentration gradient. (T/F) - ANSWERS-False
