Question

exam chapter 3
proteins in the plasma membrane:
may serve as molecular carriers
may act in cell to cell recognition
may form pores
may serve as hormone receptors
all of the above

Explanation:

• Molecular carriers: Plasma membrane proteins can transport substances across the membrane.
• Cell - to - cell recognition: Glycoproteins (proteins with attached carbohydrate chains) are involved in cell - to - cell recognition.
• Pore formation: Some proteins form channels (pores) that allow specific ions or molecules to pass through the membrane.
• Hormone receptors: Membrane - bound receptors (proteins) bind to hormones to initiate cellular responses.

Since all the first four functions are valid for plasma membrane proteins, the “all of the above” option is correct.

Answer:

all of the above