Q. Which one of the followings is correct for the transmembrane proteins in lipid bilayer?

Q. Which one of the followings is correct for the transmembrane proteins in lipid bilayer?

Q. Which one of the followings is correct for the transmembrane proteins in lipid bilayer?

  1. They are absent in animal cells.
  2. They act as channel proteins.
  3. They are absent in plant cells.
  4. They are only externally located.

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