Discuss how some cells are directly linked by specialized cell junctions.
What will be an ideal response?
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Question 2) If osmosis is occurring, then you know there is a net movement of water to an area of
a. lower osmotic pressure
b. higher hydrostatic pressure
c. higher solute concentration
d. higher water concentration
e. lower osmotic pressure and higher water concentration
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Question 3) Describe the main functions of the plasma membrane.
What will be an ideal response?
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Question 4) Which of the following can diffuse between a membrane's phospholipids into the cytosol?
a. glucose
b. sodium
c. carbon dioxide
d. integrin molecule
e. a small secretory product
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Question 5) A(n) ____________________ exists when no net movement of any ions takes place because all passive leaks are exactly balanced by active pumping.
Fill in the blank(s) with correct word
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Question 6) In a plasma membrane, simple diffusion of various substances can occur
a. through channels
b. through carriers
c. between phospholipid molecules
d. through aquaporins
e. into the cell but not out of the cell
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Question 7) The greater the ____________________ of the plasma membrane for a given ion, the greater the tendency for that ion to drive the membrane potential toward the ion's ____________________ potential.
Fill in the blank(s) with correct word
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Question 8) Which statement about movement into the cytosol is false?
a. If glucose and sodium can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.
b. In simple diffusion, the rate of entry of an ion is directly proportional to its concentration in the cytosol.
c. When a glucose symporter becomes saturated, the rate of glucose entry decreases.
d. None of the statements are false.
e. All of the statements are false.
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Question 9) The cells of excitable tissues mainly include ____________________ cells and ____________________ cells.
Fill in the blank(s) with correct word
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Question 10) Which of the following is correct?
a. Exocytosis decreases the surface area of the plasma membrane.
b. Endocytosis can help remove cytoplasmic debris from inside the cell.
c. Exocytosis is triggered by the binding of a particle in the ECF to a receptor site on the plasma membrane.
d. Exocytosis involves passive movement of material out of the cell.
e. None of these.
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