Water-channels are made up of-

Water-channels are made up of-
  1. 4 types of 8 aquaporins
  2. 8 different aquaporins
  3. 4 different aquaporins
  4. 6 types of 8 aquaporins

Solution

the transport protein then rotates and releases the molecule inside the cell, e.g., water channels – made up of eight different types of aquaporins.

Asked in: NCERT

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