Question

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question
which of the following binds to a specific receptor and initiates a response in a cell?
answer
g protein
protein kinase
ligand
cyclic amp
i dont know yet

Explanation:

To solve this, we analyze each option:

• G protein: Transduces signals after receptor activation, not the initial binder.
• Protein kinase: Transfers phosphate groups in signaling, not the initial ligand - receptor binder.
• Ligand: Defined as a molecule that binds to a specific receptor (like a hormone, neurotransmitter) to initiate a cellular response.
• Cyclic AMP: A second messenger, not the initial receptor - binding molecule.

So the correct option is the one with Ligand.

Answer:

C. Ligand