Facilitated diffusion across the
cell membrane

While
water molecules can pass through the cell membrane by simple diffusion, the
rate of transport is very low. However, this slow diffusion cannot account for
the rapid water movement observed in cells. To facilitate efficient water
transport, cells rely on a specialized channel protein called aquaporin.

Refer
to the figure below and choose the correct answers. (Note: The figure displays
amino acid labels along the aquaporin channel. For example, 'H' represents the
amino acid Histidine, and 'N' represents Asparagine. The numbers 180 and 192
indicate the positions of these amino acid residues within the aquaporin
protein sequence.)

Question

Facilitated diffusion across the
cell membrane

While
water molecules can pass through the cell membrane by simple diffusion, the
rate of transport is very low. However, this slow diffusion cannot account for
the rapid water movement observed in cells. To facilitate efficient water
transport, cells rely on a specialized channel protein called aquaporin.

Refer
to the figure below and choose the correct answers.  (Note: The figure displays
amino acid labels along the aquaporin channel. For example, 'H' represents the
amino acid Histidine, and 'N' represents Asparagine. The numbers 180 and 192
indicate the positions of these amino acid residues within the aquaporin
protein sequence.)

Answer

Aquaporins use active transport mechanisms to
pump water against its concentration gradient.

Answer

Water can
move through the lipid bilayer via simple diffusion, but this process is
significantly slower than movement through aquaporins.

Answer

Both
simple and facilitated diffusion are passive transport mechanisms that do not
require energy input.

Answer

The
narrowest point in the aquaporin channel and specific amino acid residues
contribute to its selectivity by allowing only water molecules  while excluding charged species via electrostatic
repulsion

Answer

Simple diffusion and facilitated diffusion
via aquaporins both require ATP to transport water across the membrane.

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Facilitated diffusion across the cell membrane While water molecules can pas...

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