Download Chapter 7 practice quiz

Chapter 7
Membrane Structure
and Function
Active Lecture Questions for use with Classroom Response Systems
Biology, Seventh Edition
Neil Campbell and Jane Reece
Edited by William Wischusen, Louisiana State University
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
1. Based on the model of sucrose uptake in this figure, which
of the following experimental treatments would increase
the rate of sucrose transport into the cell?
a. decreasing extracellular
sucrose concentration
b. decreasing extracellular pH
c. decreasing cytoplasmic pH
d. adding an inhibitor that
blocks the regeneration of
ATP
e. adding a substance that
makes the membrane more
permeable to hydrogen ions
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
2. The carbohydrates attached to some of the
proteins and lipids of the cell membrane are
added as the membrane is refined in the Golgi
apparatus; the new membrane then forms
transport vesicles that travel to the cell
surface. On which side of the vesicle
membrane are the carbohydrates?
a. Interior surface of the vesicle membrane
b. Exterior (cytoplasmic) surface of the vesicle
membrane
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
For Questions 3-7
An artificial cell consisting of an aqueous solution enclosed in
a selectively permeable membrane has just been immersed
in a beaker containing a different solution. The membrane is
permeable to water and to the simple sugars glucose and
fructose but completely impermeable to the disaccharide
sucrose.
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
3. Which solute(s) will exhibit a net diffusion into
the cell?
a. sucrose
b. glucose
c. fructose
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
4. Which solute(s) will exhibit a net diffusion out
of the cell?
a. sucrose
b. glucose
c. fructose
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
5. Which solution is hypertonic to the other?
a. the cell contents
b. the environment
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
6. In which direction will there be a net osmotic
movement of water?
a. out of the cell
b. into the cell
c. neither
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
7. After the cell is placed in the beaker, which of
the following changes will occur?
a. The artificial cell will become more flaccid.
b. The artificial cell will become more turgid.
c. The entropy of the system (cell plus
surrounding solution) will decrease.
d. The overall free energy stored in the system
will increase.
e. The membrane potential will decrease
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
8. An experiment is designed to study the mechanism of sucrose uptake
by plant cells. Cells are immersed in a sucrose solution, and the pH of
the solution is monitored with a pH meter. Samples of the cells are
taken at intervals, and the sucrose in the sampled cells is measured.
The measurements show that sucrose uptake by the cells correlates
with a rise in the pH of the surrounding solution. The magnitude of the
pH change is proportional to the starting concentration of sucrose in
the extracellular solution. A metabolic poison known to block the
ability of cells to regenerate ATP is found to inhibit the pH changes in
the extracellular solution. Based on this information which of the
following statements would you predict is correct? *
a. Sucrose uptake is the result of simple diffusion
b. Hydrogen ion movement is the result of facilitated diffusion.
c.
Sucrose moving through the membrane forces hydrogen ions in to
the cell
d. Sucrose and Hydrogen ions are transported in opposite directions
across the membrane
e. Sucrose transport is the result of a hydrogen ion contransporter.
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
9. A solution of 1 M glucose is separated by a selectively
permeable membrane from a solution of 0.2 M fructose
and 0.7 M sucrose. The membrane is not permeable to
the sugar molecules. Which of the following statements is
correct?
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
a.
Side A is hypotonic relative to
side B.
b.
The net movement of water will
be from side B to side A.
c.
The net movement of water will
be from side A to side B.
d.
Side B is hypertonic relative to
side A.
e.
There will be no net movement
of water.
10. You observe plant cells under a microscope that have just been
placed in an unknown solution. First the cells plasmolyze; after
a few minutes, the plasmolysis reverses and the cells appear
normal. What would you conclude about the unknown solute?
a. It is hypertonic to the plant cells, and its solute can not cross
the pant cell membranes.
b. It is hypotonic to the plant cells, and its solute can not cross
the pant cell membranes.
c. It is isotonic to the plant cells, but its solute can cross the
plant cell membranes.
d. It is hypertonic to the plant cells, but its solute can cross the
plant cell membranes.
e. It is hypotonic to the plant cells, but its solute can cross the
plant cell membranes.
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings
Ch 7 practice quiz answers
1. B
2. A
3. C
4. B
5. A
6. B
7. B
8. E
9. D
10. D
Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings