The diagram shows a cell surface membrane.
Which statements about the labelled molecules in the membrane are correct?
● 1 is involved in the diffusion of ions.
● 2 is involved in facilitated diffusion.
● 3 is involved in the recognition of antigens.
● 4 is involved in membrane fluidity.
1 )
1, 2 and 3
2 )
1 and 3 only
3 )
1 and 4
2 and 4 only
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