What are the types of receptors used in cell-signaling

What are (the) 4:

1. a)  Key functions of cell membranes?

2. b)  Types of receptors used in cell-signaling

3. c)  Factors that influence enzyme reaction rate.
4. d)  Functional classes of proteins. (Note: Not primary, secondary, etc)
5. e)  Factors that influence the rate of diffusion of a molecule across a membrane.

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