Download The term “fluid mosaic model” refers to ______.

BIOLOGY Life on Earth
WITH PHYSIOLOGY Tenth Edition
Audesirk Audesirk Byers
5
Cell Membrane
Structure and Function
Active Lecture Questions by
Carol R. Anderson
Westwood College, River Oaks Campus
© 2014 Pearson Education, Inc.
Which of the following is nonpolar?
a. Fatty acid tails
b. Water channels
c. Water
d. Phospholipid heads
© 2014 Pearson Education, Inc.
Which of the following is nonpolar?
a. Fatty acid tails
b. Water channels
c. Water
d. Phospholipid heads
© 2014 Pearson Education, Inc.
The term “fluid mosaic model” refers to ________.
a. an experiment that shows the function of the cell
membrane
b. the dynamic flow of proteins and lipids within
the membrane
c. the cell membrane’s ability to communicate with
the fluid portions of the cell
d. the cell’s ability to communicate with the fluid
portions of the membrane
© 2014 Pearson Education, Inc.
The term “fluid mosaic model” refers to ________.
a. an experiment that shows the function of the cell
membrane
b. the dynamic flow of proteins and lipids within
the membrane
c. the cell membrane’s ability to communicate with
the fluid portions of the cell
d. the cell’s ability to communicate with the fluid
portions of the membrane
© 2014 Pearson Education, Inc.
An organism living at the equator has more
saturated phospholipids in its cell membranes than
an organism living at the South Pole. Why?
a. In cold climates, more unsaturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
b. In cold climates, more saturated fats with kinked tails are
needed to maintain the fluidity of the cell membranes.
c. In warm climates, more unsaturated fats with kinked tails
are needed to maintain the fluidity of the cell membranes.
d. In warm climates, more saturated fats with kinked tails are
needed to maintain the fluidity of the cell membranes.
© 2014 Pearson Education, Inc.
An organism living at the equator has more
saturated phospholipids in its cell membranes than
an organism living at the South Pole. Why?
a. In cold climates, more unsaturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
b. In cold climates, more saturated fats with kinked tails are
needed to maintain the fluidity of the cell membranes.
c. In warm climates, more unsaturated fats with kinked tails
are needed to maintain the fluidity of the cell membranes.
d. In warm climates, more saturated fats with kinked tails are
needed to maintain the fluidity of the cell membranes.
© 2014 Pearson Education, Inc.
The phospholipid tails of the membrane face one
another because __________.
a. they are hydrophilic—repelled by water
b. they are hydrophobic—attracted to water
c. they are hydrophilic—attracted to water
d. they are hydrophobic—repelled by water
© 2014 Pearson Education, Inc.
The phospholipid tails of the membrane face one
another because __________.
a. they are hydrophilic—repelled by water
b. they are hydrophobic—attracted to water
c. they are hydrophilic—attracted to water
d. they are hydrophobic—repelled by water
© 2014 Pearson Education, Inc.
Which of the following is NOT a function of cell
membrane proteins?
a. To move hydrophilic substances across the plasma
membrane
b. To communicate with other cells
c. To isolate the inside of the cell from the
outside
d. To identify cell type
© 2014 Pearson Education, Inc.
Which of the following is NOT a function of cell
membrane proteins?
a. To move hydrophilic substances across the plasma
membrane
b. To communicate with other cells
c. To isolate the inside of the cell from the outside
d. To identify cell type
© 2014 Pearson Education, Inc.
Which is NOT a form of active transport?
a. Pinocytosis
b. Receptor-mediated transport
c. Phagocytosis
d. Osmosis
© 2014 Pearson Education, Inc.
Which is NOT a form of active transport?
a. Pinocytosis
b. Receptor-mediated transport
c. Phagocytosis
d. Osmosis
© 2014 Pearson Education, Inc.
Which cell has the highest surface area/volume
ratio?
a. A cell with a radius of 10 units
b. A cell with a radius of 20 units
c. A cell with a radius of 50 units
d. A cell with a radius of 100 units
© 2014 Pearson Education, Inc.
Which cell has the highest surface area/volume
ratio?
a. A cell with a radius of 10 units
b. A cell with a radius of 20 units
c. A cell with a radius of 50 units
d. A cell with a radius of 100 units
© 2014 Pearson Education, Inc.
A semipermeable membrane separates two
solutions, permitting water, but not larger molecules,
to pass. Side A contains a 20% sugar solution. Side B
contains a 40% sugar solution. At equilibrium, what
condition is true?
a. Side A will be hypertonic to side B.
b. Side A will be hypotonic to side B.
c. Side A will be isotonic to side B.
d. Side B will be hypotonic to side A.
© 2014 Pearson Education, Inc.
A semipermeable membrane separates two
solutions, permitting water, but not larger molecules,
to pass. Side A contains a 20% sugar solution. Side B
contains a 40% sugar solution. At equilibrium, what
condition is true?
a. Side A will be hypertonic to side B.
b. Side A will be hypotonic to side B.
c. Side A will be isotonic to side B.
d. Side B will be hypotonic to side A.
© 2014 Pearson Education, Inc.
Which membrane process requires molecules to
bind to a membrane protein?
a. Water movement through channels
b. Oxygen diffusion through the membrane
c. Receptor-mediated transport
d. Lipid movement across membranes
© 2014 Pearson Education, Inc.
Which membrane process requires molecules to
bind to a membrane protein?
a. Water movement through channels
b. Oxygen diffusion through the membrane
c. Receptor-mediated transport
d. Lipid movement across membranes
© 2014 Pearson Education, Inc.
Facilitated diffusion uses what kind of protein?
a. Recognition
b. Enzyme
c. Attachment
d. Carrier
© 2014 Pearson Education, Inc.
Facilitated diffusion uses what kind of protein?
a. Recognition
b. Enzyme
c. Attachment
d. Carrier
© 2014 Pearson Education, Inc.
The salt concentration of the fluid surrounding a cell
is more concentrated than the fluid inside the cell.
The cell will ________.
a. shrink
b. swell
c. stay the same
d. transport salt into the cell
© 2014 Pearson Education, Inc.
The salt concentration of the fluid surrounding a cell
is more concentrated than the fluid inside the cell.
The cell will ________.
a. shrink
b. swell
c. stay the same
d. transport salt into the cell
© 2014 Pearson Education, Inc.
What type of cell junctions are needed for a tissue
that must prevent fluids from leaking across its cell
layer?
a. Desmosomes
b. Tight junctions
c. Gap junctions
d. Plasmodesmata
© 2014 Pearson Education, Inc.
What type of cell junctions are needed for a tissue
that must prevent fluids from leaking across its cell
layer?
a. Desmosomes
b. Tight junctions
c. Gap junctions
d. Plasmodesmata
© 2014 Pearson Education, Inc.
In active transport, the energy source that moves a
molecule against its concentration gradient
is ________.
a. glucose
b. NADPH
c. NADH
d. ATP
© 2014 Pearson Education, Inc.
In active transport, the energy source that moves a
molecule against its concentration gradient
is ________.
a. glucose
b. NADPH
c. NADH
d. ATP
© 2014 Pearson Education, Inc.
Animal cells communicate with one another through
___________.
a. desmosomes
b. tight junctions
c. gap junctions
d. plasmodesmata
© 2014 Pearson Education, Inc.
Animal cells communicate with one another through
___________.
a. desmosomes
b. tight junctions
c. gap junctions
d. plasmodesmata
© 2014 Pearson Education, Inc.
Which of the transport processes in the figure below
results in the movement of molecules from a high to
a low concentration?
a. Only a
b. Only c
c. a and c
d. a, b, c, and d
© 2014 Pearson Education, Inc.
Figure 5-6
Which of the transport processes in the figure below
results in the movement of molecules from a high to
a low concentration?
a. Only a
b. Only c
c. a and c
d. a, b, c, and d
© 2014 Pearson Education, Inc.
Figure 5-6
In the figure below, what is the correct association?
a. Trunk lipids:
high fatty acid fluidity
b. Trunk lipids:
unsaturated fatty acids
c. Leg lipids:
low fatty acid fluidity
d. Leg lipids:
unsaturated fatty acids
© 2014 Pearson Education, Inc.
Figure E5-2
In the figure below, what is the correct association?
a. Trunk lipids:
high fatty acid fluidity
b. Trunk lipids:
unsaturated fatty acids
c. Leg lipids:
low fatty acid fluidity
d. Leg lipids:
unsaturated fatty acids
© 2014 Pearson Education, Inc.
Figure E5-2