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Membrane Structure=
and
Function
Multiple Choice Qu=
iz
Please
answer all questions  =
; &n=
bsp;
1. &n=
bsp;
Principal classes of membrane proteins inclu=
de
all of the following except &nbs=
p; &=
nbsp;
A) &n=
bsp;
receptors&nb=
sp;
B) &n=
bsp;
cell surface markers
C) &n=
bsp;
spectrins&nb=
sp;
D) &n=
bsp;
transport proteins
&=
nbsp; &nb=
sp;
2. &n=
bsp;
Which of the following are not components of=
the
cell membrane?  =
; &n=
bsp;  =
;
A) &n=
bsp;
cell surface markers
B) &n=
bsp;
transmembrane proteins
C) &n=
bsp;
interior protein network
D) &n=
bsp;
plasmodesmata
&=
nbsp; &nb=
sp;
3. &n=
bsp;
To cross the cell membrane, water must &=
nbsp; &nbs=
p;
A) &n=
bsp;
squeeze between phospholipid molecules
B) &n=
bsp;
pass through aquaporins
C) &n=
bsp;
be transported at the expense of ATP &=
nbsp;
D) &n=
bsp;
be moved by a cotransport system
&=
nbsp; &nb=
sp;
4. &n=
bsp;
If a cell's contents are greatly hypoosmotic=
to
the surrounding environment, the cell will probably
A) &n=
bsp;
expand =
B) &n=
bsp;
become isotonic
C) &n=
bsp;
burst &=
nbsp;
D) &n=
bsp;
shrivel =
;
&=
nbsp; &nb=
sp;
5. &n=
bsp;
The sodium-potassium pump passes &=
nbsp; &nbs=
p;
A) &n=
bsp;
more Na+ out than K+ in
B) &n=
bsp;
K+ out and Na+ in on a one-for-one basis
C) &n=
bsp;
Na+ out and K+ in on a one-for-one basis
D) &n=
bsp;
K+ and Na+ in the same direction
&=
nbsp;
6. &n=
bsp;
Exocytosis is a process by which cells &=
nbsp; &nbs=
p;
A) &n=
bsp;
pass substances out of the cell in vesicles<=
span
style=3D'mso-tab-count:1'>
B) &n=
bsp;
pass substances out of the cell through the
membrane by osmosis =
C) &n=
bsp;
release substances directly into the
extracellular fluid through a pore &nb=
sp;
D) &n=
bsp;
release substances directly into the
extracellular fluid through a pit &nbs=
p;
E) &n=
bsp;
identify substances in the environment &=
nbsp;
&=
nbsp; &nb=
sp;
7. &n=
bsp;
A phospholipid has =
&nb=
sp;
A) &n=
bsp;
a phosphate group in place of one fatty acid=
B) &n=
bsp;
phosphate groups in place of two fatty acids=
C) &n=
bsp;
phosphate groups in place of three fatty aci=
ds &n=
bsp;
D) &n=
bsp;
a phosphate group in place of a carbon in
glycerol
E) &n=
bsp;
none of the above &=
nbsp;
=
=
&nb=
sp;
8. &n=
bsp;
A lipid bilayer =
&nb=
sp;
A) &n=
bsp;
permits water soluble molecules to pass thro=
ugh
it
B) &n=
bsp;
facilitates the passage of water soluble
molecules through it
C) &n=
bsp;
inhibits the passage of water soluble substa=
nces
through it &nb=
sp;
D) &n=
bsp;
actively transports water soluble molecules
through it
E) &n=
bsp;
is indifferent to the passage of water molec=
ules
through it &nb=
sp;
&=
nbsp; &nb=
sp;
9. &n=
bsp;
A cell is recognized by other tissue members=
as
"self" by its surface =
&nb=
sp; =
A) &n=
bsp;
glycolipids&=
nbsp;
B) &n=
bsp;
phosphate groups
C) &n=
bsp;
glycoproteins =
D) &n=
bsp;
ketoglutaric acids
E) &n=
bsp;
glycocarbohydrates
&=
nbsp; &nb=
sp;
10. A =
net gain
of water tends to occur &n=
bsp;  =
; &n=
bsp;
A) &n=
bsp;
in a hypoosmotic solution from an isosmotic
solution
B) &n=
bsp;
in an isosmotic solution from a hyperosmotic
solution
C) &n=
bsp;
in a hyperosmotic solution from a hypoosmotic
solution  =
;
D) &n=
bsp;
in a hypoosmotic solution from a hyperosmotic
solution  =
;
E) &n=
bsp;
in one isosmotic solution from another isosm=
otic
solution of the same composition  =
;
&=
nbsp;
11. Re=
d blood
cells have a characteristic concave shape because of =
&nb=
sp;
A) &n=
bsp;
spectrin&nbs=
p;
B) &n=
bsp;
dextrin =
;
C) &n=
bsp;
hemoglobin&n=
bsp;
D) &n=
bsp;
hemocyanin&n=
bsp;
E) &n=
bsp;
iron <=
/span>
&=
nbsp;
12. By=
a
mechanism called cotransport &nb=
sp; =
&nb=
sp;
A) &n=
bsp;
sugar moves down its concentration gradient
while sodium moves up its concentration gradient
B) &n=
bsp;
sodium moves outward against is concentration
gradient while sugar moves inward down its concentration gradient
C) &n=
bsp;
sugar and sodium move inward down their
concentration gradient &nb=
sp;
D) &n=
bsp;
sodium moves inward down its concentration
gradient while sugar moves inward up its concentration gradient
E) &n=
bsp;
sodium and sugar move outward against their
concentration gradient <=
span
style=3D'mso-spacerun:yes'>
&=
nbsp; &nb=
sp;
13. Ma=
ny
surface proteins are anchored by  =
; &n=
bsp;
A) &n=
bsp;
polar amino acids
B) &n=
bsp;
hydrogen bonding amino acids &=
nbsp;
C) &n=
bsp;
nonpolar fatty acids
D) &n=
bsp;
nonpolar amino acids
E) &n=
bsp;
polar fatty acids
&=
nbsp; &nb=
sp;
14. Tr=
ansmembrane
proteins are &=
nbsp; &nbs=
p;
A) &n=
bsp;
always fixed in position
B) &n=
bsp;
always abundant
C) &n=
bsp;
often not fixed in position
D) &n=
bsp;
never abundant
E) &n=
bsp;
none of the above &=
nbsp;
&=
nbsp; &nb=
sp;
15. Cy=
stic
fibrosis results from defective ion channels for =
&nb=
sp;
A) &n=
bsp;
Na+ <=
span
style=3D'mso-spacerun:yes'>
B) &n=
bsp;
Cl- &nb=
sp;
C) &n=
bsp;
Ca++ &n=
bsp;
D) &n=
bsp;
ClO3- &=
nbsp;
E) &n=
bsp;
H+
&=
nbsp; &nb=
sp;
16. Fl=
uidity
of phospholipid bilayer is increased by&nbs=
p; &=
nbsp; &nbs=
p;
A) &n=
bsp;
double bonds between carbon atoms in the fat=
ty
acid tails &nb=
sp;
B) &n=
bsp;
steroid lipids at certain temperatures
C) &n=
bsp;
poor alignment of the fatty acids tails &n=
bsp;
D) &n=
bsp;
cholesterol at certain temperatures
E) &n=
bsp;
all of the above
&=
nbsp; &nb=
sp;
17. A =
cell
engaged in phagocytosis must be =
&nb=
sp;
A) &n=
bsp;
engulfing a live organism
B) &n=
bsp;
acquiring a liquid
C) &n=
bsp;
engulfing a dead organism &=
nbsp;
D) &n=
bsp;
transporting bulk dissolved nutrients
E) &n=
bsp;
transporting bulk solid material &=
nbsp;
&=
nbsp;
18. Bl=
ood
groups are marked by surface &nb=
sp; =
&nb=
sp;
A) &n=
bsp;
glycoproteins =
B) &n=
bsp;
glycolipids&=
nbsp;
C) &n=
bsp;
glycocarbohydrates
D) &n=
bsp;
glycerol&nbs=
p;
E) &n=
bsp;
gluterates&n=
bsp;
&=
nbsp;
19. In=
each
cycle the sodium-potassium pumps transfer&n=
bsp;  =
; &n=
bsp;
A) &n=
bsp;
two potassium ions in and two sodium ions ou=
t &=
nbsp;
B) &n=
bsp;
one sodium ion out and one potassium ion in<=
span
style=3D'mso-tab-count:1'>
C) &n=
bsp;
three sodium ions out and two potassium ions=
in &=
nbsp;
D) &n=
bsp;
one potassium ion out and two sodium ions in=
&n=
bsp;
E) &n=
bsp;
three sodium ions in and two potassium ions =
out &=
nbsp;
&=
nbsp; &nb=
sp;
20. __=
__________________
are transported by a particular carrier or pass through a particular channe=
l
A) &n=
bsp;
All water soluble ions or molecules
B) &n=
bsp;
Certain water soluble molecules or ions &=
nbsp;
C) &n=
bsp;
All insoluble molecules or ions &=
nbsp;
D) &n=
bsp;
Certain insoluble ions or molecules
E) &n=
bsp;
Only the smallest molecules or ions
&=
nbsp; &nb=
sp;
21. Eq=
uilibrium
is reached in an aqueous solution when =
; &n=
bsp;  =
;
A) &n=
bsp;
random motion stops
B) &n=
bsp;
water molecules and dissolved molecules are
moving at the same rate
C) &n=
bsp;
the dissolved molecules or ions are equally
distributed throughout the solution &n=
bsp;
D) &n=
bsp;
molecular motion stops
E) &n=
bsp;
there are the same number of water molecules=
as
dissolved molecules
&=
nbsp; &nb=
sp;
22. Su=
bstances
transported by facilitated diffusion &=
nbsp; &nbs=
p; &=
nbsp;
A) &n=
bsp;
move passively through specific channels fro=
m an
area of greater concentration to one of lower concentration &=
nbsp;
B) &n=
bsp;
are limited to solvents
C) &n=
bsp;
must have movements coupled to those of other
substances
D) &n=
bsp;
may flow to a region of higher concentration=
by
the expenditure of energy =
E) &n=
bsp;
are restricted to only one direction through=
the
membrane  =
;
23. In=
a lipid
bilayer the lipids have &n=
bsp;  =
;
A) &n=
bsp;
their water repelling heads facing inward
B) &n=
bsp;
their water repelling tails facing inward
C) &n=
bsp;
their hydrogen bond forming heads facing inw=
ard
D) &n=
bsp;
their hydrogen bond forming tails facing inw=
ard &=
nbsp;
E) &n=
bsp;
no relationship to water
&=
nbsp; &nb=
sp;
24. A =
lipid
bilayer is held together by &nbs=
p; &=
nbsp; &nbs=
p;
A) &n=
bsp;
surface tension
B) &n=
bsp;
double bonds in their fatty acid tails
C) &n=
bsp;
the attraction of the phospholipid heads to =
each
other
D) &n=
bsp;
hydrogen bonding with water &n=
bsp;
E) &n=
bsp;
the electrostatic attraction of phosphate gr=
oups
for each other
&=
nbsp; &nb=
sp;
25. The
glycocalyx is a "sugar coating" on the surface of a cell resulting
from the presence of polysaccharides on glycolipids and glycoproteins embed=
ded
in the outer layer of the plasma membrane.&=
nbsp; &nbs=
p; &=
nbsp;
A) &n=
bsp;
True &n=
bsp;
B) &n=
bsp;
False &=
nbsp;
26. Th=
reonine,
an amino acid, and arabinose, a monosaccharide, cross the cell membrane down
their concentration gradients by: &nbs=
p; &=
nbsp; &nbs=
p;
A) &n=
bsp;
diffusion.&n=
bsp;
B) &n=
bsp;
endocytosis.=
C) &n=
bsp;
phosphorylation.
D) &n=
bsp;
facilitated diffusion.
E) &n=
bsp;
osmosis.&nbs=
p;
&=
nbsp; &nb=
sp;
27. A
contractile vacuole is an organelle that pumps excess water out of many
freshwater protozoan cells. A freshwater protozoan was placed in solution A=
and
observed to form contractile vacuoles at a rate of 11 per minute. The same
protozoan was then placed in solution B and observed to form contractile
vacuoles at a rate of 4 per minute. Based on this information, which of the
following statements is correct?  =
; &n=
bsp;  =
;
A) &n=
bsp;
Solution A is hyperosmotic to solution B.
B) &n=
bsp;
Solutions A and B are isosmotic.
C) &n=
bsp;
Solution B is hyperosmotic to solution A.
D) &n=
bsp;
Solutions A and B are isosmotic to the proto=
zoan
cell.
E) &n=
bsp;
Both a and b.
&=
nbsp; &nb=
sp;
28. Th=
e net
movement of uncharged, polar molecules across a semipermeable membrane from=
a
low concentration to a high concentration occurs by facilitated diffusion.<=
span
style=3D'mso-tab-count:3'> &=
nbsp; &nbs=
p; &=
nbsp;
A) &n=
bsp;
True &n=
bsp;
B) &n=
bsp;
False &=
nbsp;
&=
nbsp;
29. The
membrane transport mechanism used when an amoeba engulfs a bacterial cell is
called: =
A) &n=
bsp;
exocytosis&n=
bsp;
B) &n=
bsp;
pinocytosis&=
nbsp;
C) &n=
bsp;
facilitated diffusion
D) &n=
bsp;
active transport
E) &n=
bsp;
phagocytosis=
<=
span
style=3D'mso-spacerun:yes'>
30. Co=
ntinuing
from the previous question, once the bacterial cell has been digested, the
amoeba will dispose of indigestible materials by which of the following
processes? &nb=
sp; =
A) &n=
bsp;
facilitated diffusion
B) &n=
bsp;
through gated channels in membrane proteins<=
span
style=3D'mso-tab-count:1'> &n=
bsp;
C) &n=
bsp;
exocytosis&n=
bsp;
D) &n=
bsp;
active transport
E) &n=
bsp;
by any of the above processes &=
nbsp;
&=
nbsp; &nb=
sp;
31. AT=
P is
required in the transport of &nb=
sp; =
&nb=
sp;
A) &n=
bsp;
water molecules
B) &n=
bsp;
all molecules across a membrane
C) &n=
bsp;
molecules to areas of lower concentrations
D) &n=
bsp;
molecules to areas of higher concentrations<=
span
style=3D'mso-tab-count:1'>
E) &n=
bsp;
molecules through a protein channel
32. The
sodium-potassium pump establishes concentration gradients &=
nbsp; &nbs=
p;
A) &n=
bsp;
of higher sodium concentrations inside the c=
ell
and higher potassium concentrations outside the cell
B) &n=
bsp;
of sodium and potassium but the area of their
concentrations (inside or outside) depends on the needs of the cell
C) &n=
bsp;
of higher potassium concentrations inside the
cell and higher sodium concentrations outside the cell
D) &n=
bsp;
of ATP inside the cell where it is needed
E) &n=
bsp;
by pumping sodium outside the cell and potas=
sium
is cotransported out as well <=
span
style=3D'mso-spacerun:yes'>
&=
nbsp; &nb=
sp;
33. In
cotransport processes, sugars can be brought into the cell against their
concentrations gradients
A) &n=
bsp;
because ATP powers the pump that brings them=
in
B) &n=
bsp;
because they follow sodium ions into the cell
which are traveling down their concentration gradients
C) &n=
bsp;
because they follow potassium in through the
sodium-potassium pump
D) &n=
bsp;
through endocytosis
E) &n=
bsp;
sugar enters the cell by all of the processes
listed above &=
nbsp;
&=
nbsp; &nb=
sp;
34. The
methods of membrane transport that don't require protein channels or carrie=
rs
are
A) &n=
bsp;
osmosis =
;
B) &n=
bsp;
diffusion&nb=
sp;
C) &n=
bsp;
phagocytosis=
<=
span
style=3D'mso-spacerun:yes'>
D) &n=
bsp;
exocytosis&n=
bsp;
E) &n=
bsp;
all of the above