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26 October, 09:28

All of the following are transmembrane pumps that facilitate active transport except?

a) ATP-driven pumps

b) Channel pumps

c) Light-driven pump

d) Coupled pumps

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Answers (1)
  1. 26 October, 13:24
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    b) Channel pumps

    Explanation:

    The channels are the transmembrane proteins that serve in the passive transport of substances down the concentration gradient. The channels can be gated or non-gated. The gated channels are opened and closed in response to certain stimuli such as electrical change.

    For example, aquaporins are the gated water channels that transport the water across the plasma membrane. The process is driven by the osmotic gradient and does not use the energy of ATP.
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