Bio 101 REAL Exam 2 QUESTIONS WITH 100
%VERIFIED ANSWERS
Which of the following statements regarding osmosis is
false?
A. Osmosis is the movement of water along a
concentration gradient.
B. In osmosis, water moves to equalize solute concentrations on either
side of the membrane.
C. The movement of water across a membrane can affect
the turgor pressure of some cells.
D. If osmosis occurs across a membrane, then diffusion is
not occurring.
E. During osmosis water is moving through membrane
channels. - ANSWER If osmosis occurs across a
membrane, then diffusion is not occurring.
Channel proteins allow ions that would not normally pass
through the cell membrane to pass through via the
channel. What property of the channel proteins makes this
possible?
a. A pore of polar amino acid groups.
b. A pore of hydrophobic amino acid groups
,c. A pore of Ca2+
d. All of the above
e. None of the above - ANSWER A pore of polar amino
acid groups.
(The charged or polar lining of the channel proteins allows
for passage of polar and charged molecules.
Which of the following limits the MOVEMENT of
molecules by means of carrier-mediated
facilitated diffusion?
a. The concentration gradient
b. The availability of carrier molecules
c. Temperature
d. Both a and b
e. All of the above - ANSWER The concentration gradient
and the availability of the carrier molecules.
Active transport differs from passive transport in that
active transport
a. Requires energy
b. Never requires direct input of ATP
, c. Moves molecules with a concentration gradient
d. Both b and c
e. Both a and c - ANSWER Requires energy
Single-celled animals, such as amoebas, engulf entire
cells for food. This manner of "eating" is called
a. Exocytosis
d. Active transport
b. Endocytosis
e. Osmosis
c. Facilitative transport - ANSWER Endocytosis (type of
phagoctyosis)
Many cells have a sodium-potassium pump. In order to
function, sodium-potassium pumps require
a. ATP.
b. A channel protein.
c. The absence of a concentration gradient.
d. ADP.
e. All of the above - ANSWER ATP (forms of primary
active transport)
%VERIFIED ANSWERS
Which of the following statements regarding osmosis is
false?
A. Osmosis is the movement of water along a
concentration gradient.
B. In osmosis, water moves to equalize solute concentrations on either
side of the membrane.
C. The movement of water across a membrane can affect
the turgor pressure of some cells.
D. If osmosis occurs across a membrane, then diffusion is
not occurring.
E. During osmosis water is moving through membrane
channels. - ANSWER If osmosis occurs across a
membrane, then diffusion is not occurring.
Channel proteins allow ions that would not normally pass
through the cell membrane to pass through via the
channel. What property of the channel proteins makes this
possible?
a. A pore of polar amino acid groups.
b. A pore of hydrophobic amino acid groups
,c. A pore of Ca2+
d. All of the above
e. None of the above - ANSWER A pore of polar amino
acid groups.
(The charged or polar lining of the channel proteins allows
for passage of polar and charged molecules.
Which of the following limits the MOVEMENT of
molecules by means of carrier-mediated
facilitated diffusion?
a. The concentration gradient
b. The availability of carrier molecules
c. Temperature
d. Both a and b
e. All of the above - ANSWER The concentration gradient
and the availability of the carrier molecules.
Active transport differs from passive transport in that
active transport
a. Requires energy
b. Never requires direct input of ATP
, c. Moves molecules with a concentration gradient
d. Both b and c
e. Both a and c - ANSWER Requires energy
Single-celled animals, such as amoebas, engulf entire
cells for food. This manner of "eating" is called
a. Exocytosis
d. Active transport
b. Endocytosis
e. Osmosis
c. Facilitative transport - ANSWER Endocytosis (type of
phagoctyosis)
Many cells have a sodium-potassium pump. In order to
function, sodium-potassium pumps require
a. ATP.
b. A channel protein.
c. The absence of a concentration gradient.
d. ADP.
e. All of the above - ANSWER ATP (forms of primary
active transport)
