Which statements about the proteins and glycoproteins in cell surface membranes are correct?
1 They can allow cells to bond together to form tissues.
2 They can recognise messenger molecules like hormones.
3 They can be antigens and allow cell to cell recognition.
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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