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Cell Membrane

Aquaporins ar...

Question

Aquaporins are the which enable the movement of water across the plasma membrane.

A

proteins

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B

carbohydrates

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C

lipids

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D

ions

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Solution

The correct option is A proteins
Aquaporins are proteins in the cell membrane which enable the movement of water by forming channels across the plasma membrane.

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are proteins which enable the movement of water across the cell membrane.

Name the factor responsible for movement of water across plasma membrane.

Q. Aquaporins are transport channels, which

(I) Are found in both plants and animals
(II) Allow for faster water movement between the cells than osmosis
(III) Allow water molecules to pass during transpiration
(IV) Do not open during drought stress

Q. Aquaporins are integral proteins of the plasma membrane whose role is to allow the passage of water molecules down its concentration gradient.
Recent observations have shown an interesting arrangement of charged amino acid residues along the inner surface of the channel resulting in the entry of water via its oxygen, then flipping to lead with its hydrogens half way through the channel.
How might this explain aquaporins specificity for water and not cations or protons?

Q. Movement of gases across plasma membrane occurs through ______________

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