76 ■ CHAPTER 04 Life Is Cellular
(^11) Use the accompanying image to select the correct terms in the
statements below each of the cells shown.
(a) This red blood cell is in a(n) (hypertonic / hypotonic / isotonic)
solution.
(b) In this environment, normal red blood cells (gain / lose / neither
gain nor lose) water.
(c) The total solute concentration outside the cell is (lower than /
higher than / equal to) the total solute concentration inside it.
(d) This red blood cell is in a(n) (hypertonic / hypotonic / isotonic)
solution.
(e) In this environment, normal red blood cells (gain / lose / neither
gain nor lose) water.
(f) The total solute concentration outside the cell is (lower than /
higher than / equal to) the total solute concentration inside it.
(^7) Examine the graph presented here. Using your knowledge of
how the processes work, label each curve as representative of
either simple diffusion or facilitated diffusion. Explain how you
determined which curve was which.
Figure 04.B
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Concentration
Rate of transport
Transport proteins
saturated
Concentration
Rate oftransport
Transport proteins saturated
(^8) Which of the following statements about transport through the
plasma membrane of a cell is correct?
(a) Both passive and active transport require the input of energy.
(b) Passive transport does not require the input of energy, and
active transport does.
(c) Passive transport does require the input of energy, and active
transport does not.
(d) Neither active nor passive transport requires the input of
energy.
Tr y Something New
(^9) Picture a beaker divided by a semipermeable membrane like
the one in Figure 4.6. Imagine that you put 5 grams of sugar in the
left side of the beaker and 10 grams of sugar in the right side, and
then add water to bring both sides to the same depth. Select the
correct terms in the following description of what happens next:
The water will move by osmosis to the (left side / right side) of the
beaker because there are (more / fewer) molecules of solute and (more
/ fewer) molecules of water on that side.
(^10) When the chemical oligomycin is added to cells, the production
of ATP is blocked. Which of the following processes would be most
affected by oligomycin?
(a) simple diffusion
(b) facilitated diffusion
(c) active transport
(d) All of these processes would be equally affected by oligomycin.
(e) None of these processes would be affected by oligomycin.