Question

the components of the plasma membrane that bind to specific molecules in the extracellular fluid surrounding the cell are the ________. options: carrier proteins, receptor proteins, channel proteins, enzymes, i dont know yet

Explanation:

To solve this, we analyze each option:

• Carrier proteins: Transport substances across the membrane, not mainly for binding specific extracellular molecules.
• Receptor proteins: These are membrane components that specifically bind to molecules (like hormones, signaling molecules) in the extracellular fluid to initiate a response.
• Channel proteins: Form channels for ion or molecule passage, not for specific binding of extracellular molecules.
• Enzymes: Catalyze reactions, not primarily for binding extracellular molecules.

So receptor proteins match the description.

Answer:

B. receptor proteins (assuming the second option is labeled B; if the original labels are different, adjust accordingly, but based on the options, the correct one is "receptor proteins")