The Na⁺/K⁺ pump is an example of

Answer: Primary active transport (uses ATP) The pump uses ATP hydrolysis to move 3 Na⁺ out and 2 K⁺ in per cycle, against their gradients.

Bulk transport (endocytosis / exocytosis) requires

Answer: ATP and membrane reorganization Vesicle formation, movement along cytoskeletal tracks, and fusion all require ATP.

The process depicted in the diagram is:

Answer: Endocytosis - membrane invagination engulfing extracellular material Inward folding of the plasma membrane that captures extracellular cargo into a new internal vesicle is endocytosis.

AP Biology · Topic 2.9

Mechanisms of Transport Practice

Part of Cell Structure and Function.(ENE-1.I)

Practice questions

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Sample questions

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Sample 1difficulty 2/5
$The Na⁺/K⁺ pump is an example of$
- A
  $Bulk endocytic vesicle uptake$
- B
  $Facilitated diffusion (no ATP)$
- C
  $Primary active transport (uses ATP)$
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- D
  $Simple diffusion (no protein)$
Why
$The pump uses ATP hydrolysis to move 3 Na⁺ out and 2 K⁺ in per cycle, against their gradients.$
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Sample 2difficulty 2/5
$Bulk transport (endocytosis / exocytosis) requires$
- A
  $Only ion channel proteins alone$
- B
  $Simple diffusion across bilayer$
- C
  $No energy and only diffusion$
- D
  $ATP and membrane reorganization$
  check_circle
Why
$Vesicle formation, movement along cytoskeletal tracks, and fusion all require ATP.$
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Sample 3difficulty 2/5
$The process depicted in the diagram is:$
- A
  $Endocytosis - membrane invagination engulfing extracellular material$
  check_circle
- B
  $Active transport - pumps moving ions$
- C
  $Diffusion - solutes crossing the bilayer directly$
- D
  $Exocytosis - vesicles fusing with the plasma membrane$
Why
$Inward folding of the plasma membrane that captures extracellular cargo into a new internal vesicle is endocytosis.$
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Sample 4difficulty 2/5
$The role of exocytosis in cells includes all of the following EXCEPT:$
- A
  $Adding new membrane to the plasma membrane$
- B
  $Releasing neurotransmitters into a synapse$
- C
  $Secreting hormones from endocrine cells$
- D
  $Importing extracellular nutrients into the cytosol$
  check_circle
Why
$Exocytosis exports material out of the cell. Importing extracellular material is endocytosis, not exocytosis.$
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Sample 5difficulty 2/5
$The cellular process shown — engulfing a large particle by the cell membrane — is called$
- A
  $Diffusion$
- B
  $Pinocytosis$
- C
  $Phagocytosis$
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- D
  $Exocytosis$
Why
$Phagocytosis ("cell eating") engulfs particles like bacteria into a vesicle that fuses with a lysosome for digestion.$
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