Which statements about the proteins in cell surface membranes are correct?
1 They can be involved in active transport and facilitated diffusion.
2 They can be involved in antigen recognition.
3 They have hydrophilic R groups to interact with the inner portion of the membrane.
1 )
1, 2 and 3
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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