Question

1. determine what type of movement/transport applies to each of the examples below. (7 points)

optional labels: (multiple labels may apply! list all of them for full credit)
active transport\tsimple diffusion\tfacilitated diffusion
passive transport\tosmosis\tendocytosis
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plasma membrane
noncharged molecules
water $ce{h_{2}o}$
sugar
charged molecules and ions
large molecules
$ce{na^{+}/k^{+}}$ pump
atp
#1
#2
#3
#4
1.
2.
3.
4.

Explanation:

1. Noncharged molecules move directly through the phospholipid bilayer without proteins or energy, which is simple diffusion, a type of passive transport.
2. Water moves through an integral protein channel down its gradient; this is osmosis, a subset of facilitated diffusion and passive transport.
3. The Na⁺/K⁺ pump uses ATP to move charged ions against their gradient, which is active transport.
4. Large molecules are engulfed by the plasma membrane, requiring energy, which is endocytosis (a type of active transport).

Answer:

1. simple diffusion, passive transport
2. osmosis, facilitated diffusion, passive transport
3. active transport
4. endocytosis, active transport