Which statements about the components of the cell surface membrane are correct?
1 Diffusion can take place through lipids and protein pores.
2 Endocytosis only involves lipids.
3 Facilitated diffusion only involves proteins.
4 Osmosis only involves proteins.
1 )
1, 2, 3 and 4
2 )
1, 3 and 4 only
1 and 3 only
4 )
2 and 4 only
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