Download STUDY GUIDE SECTION 5

STUDY GUIDE SECTION 5-1
Passive Transport
Name _____________________
Period __________
Date ____________
Multiple Choice-Write the correct letter in the blank.
1. ______Substances that can pass through cell membranes by diffusion include
a. Na+ ions
b. Cl- ions
c. glucose
d. oxygen
2. ______The contractile vacuole of a paramecium should be active when the paramecium
is in
a. an isotonic environment
c. a hypertonic environment
b. a hypotonic environment
d. any environment
3. ______ When a human red blood cell is placed in a hypotonic environment, it will
a. undergo cytolysis
c. experience a decrease in turgor pressure
b. undergo plasmolysis
d. be at equilibrium
4. ______ Facilitated diffusion is often used to transport
a. ions
c. molecules that are not soluble in lipids
b. water
d. molecules that are too small to diffuse across the membrane.
5. ______Na+ ions enter cells by
a. diffusing across the lipid bilayer without assistance.
b. diffusing through Na+ ion channels
c. binding to carrier proteins.
d. binding to Cl- ions.
Short Answer-Answer the following questions in complete sentences.
1. Explain how osmosis is related to diffusion. ____________________________________
________________________________________________________________________
________________________________________________________________________
2. If the concentration of solute molecules outside a cell is lower than the concentration in
the cytosol, is the external solution hypotonic, hypertonic, or isotonic to the cytosol?
________________________________________________
3. Explain what happens to the movement of molecules at equilibrium. ________________
________________________________________________________________________
________________________________________________________________________
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4. How do carrier proteins transport substances across cell membranes? ________________
________________________________________________________________________
________________________________________________________________________
5. The diagram below shows three cells in three different solutions. Label the hypertonic,
isotonic and hypotonic set up. For each set up, draw an arrow showing the overall net
movement of water.
A. _________________
B. _________________
C. __________________
STRUCTURES AND FUNCTIONS The drawing below show the appearance of a red blood
cell and a plant cell in an isotonic, hypotonic and hypertonic environments. Label each
environment in the spaces provided.
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STUDY GUIDE SECTION 5-2
Active Transport
Multiple Choice-Write the correct letter in the blank.
1. ______ Facilitated-diffusion carrier proteins and cell-membrane pumps both
a. require an input of energy.
b. are specific for the kinds of substances they transport.
c. transport substances up their concentration gradient.
d. carry out active transport.
2. ______The sodium-potassium pump transports
a. Na+ out of the cell and K+ into the cell.
b. Na+ and K+ in both directions across the cell membrane.
c. K+ out of the cell and Na+ into the cell.
d. Na+ during some cycles and K+ during other cycles.
3. ______ The energy needed to power the sodium-potassium pump is provided by the
a. binding of ATP to the pump.
c. removal of a phosphate group from ATP.
b. transport of ATP by the pump.
d. formation of ATP.
4. ______Pinocytosis involves the transport of
a. large particles out of a cell.
c. whole cells in to another cell.
b. fluids into a cell.
d. lysosomes out of a cell.
5. ______Exocytosis is a
a. type of passive transport.
b. mechanism by which cells ingest other cells.
c. transport process in which vesicles are formed from pouches in the cell
membrane.
d. way for cells to release large molecules, such as proteins.
Short Answer-Answer the following questions in complete sentences.
1. Explain two differences between passive transport and active transport.
A. _____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
B. _____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
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2. What provides the energy that drives the sodium-potassium pump? _________________
_______________________________________________________________________
3. Explain how endocytosis and exocytosis differ. _________________________________
________________________________________________________________________
________________________________________________________________________
4. Why is the sodium-potassium transport mechanism called a “pump”? ________________
________________________________________________________________________
________________________________________________________________________
5. Explain how a phagocyte destroys bacteria. ____________________________________
________________________________________________________________________
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STRUCTURES AND FUNCTIONS
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