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Cell Membrane Part 2 Virtual Lab
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by John Lundy
| 14 Questions
Note from the author:
A virtual lab looking at tonicity and active transport
Figure 5.12 Osmotic pressure changes the shape of red blood cells in hypertonic, isotonic, and hypotonic
solutions. (credit: Mariana Ruiz Villareal)
Figure 5.16 Electrochemical gradients arise from the combined effects of concentration gradients and electrical
gradients. (credit: “Synaptitude”/Wikimedia Commons)
Figure 5.19 An electrochemical gradient, created by primary active transport, can move other substances against
their concentration gradients, a process called co-transport or secondary active transport. (credit: modification of
work by Mariana Ruiz Villareal)
4
1 pt
What problem is faced by organisms that live in fresh
water?

a. Their bodies tend to take in too much water.
b. They have no way of controlling their tonicity.
c. Only salt water poses problems for animals that
live in it.
d. Their bodies tend to lose too much water to their
environmen
5
1 pt
Active transport must function continuously because
__________.
a. plasma membranes wear out
b. not all membranes are amphiphilic
c. facilitated transport opposes active transport
d. diffusion is constantly moving solutes in
opposite directions
6
1 pt
How does the sodium-potassium pump make the
interior of the cell negatively charged?
a. by expelling anions
b. by pulling in anions
c. by expelling more cations than are taken in
d. by taking in and expelling an equal number of
cations
7
1 pt
What is the combination of an electrical gradient and a
concentration gradient called?
a. potential gradient
b. electrical potential
c. concentration potential
d. electrochemical gradient
8
1 pt
What happens to the membrane of a vesicle after
exocytosis?
a. It leaves the cell.
b. It is disassembled by the cell.
c. It fuses with and becomes part of the plasma
membrane.
d. It is used again in another exocytosis event.
9
1 pt
Which transport mechanism can bring whole cells into
a cell?
a. pinocytosis
b. phagocytosis
c. facilitated transport
d. primary active transport
10
1 pt
In what important way does receptor-mediated
endocytosis differ from phagocytosis?
a. It transports only small amounts of fluid.
b. It does not involve the pinching off of
membrane.
c. It brings in only a specifically targeted
substance.
d. It brings substances into the cell, while
phagocytosis removes substances.
12
1 pt
Where does the cell get energy for active transport
processes?
Endoplasmic Reticulumn
Necliouse
Mitochondrians
Vesicels
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