Question

Which of the following occurs when a molecule fits into the binding site of a receptor protein on a cell’s surface?

Answer 1

When a signal molecule binds a membrane receptor, different intracellular events occur in response. Option D is correct: All of the above.

What is signals translation and how is it done?

Signal translation is the conversion global process of extracellular signals into intracellular responses. This porcess is done by a translator.

Translation might be

• INDIRECT ⇒ Second messengers participate in the signal translation, mediating between receptor and the cellular response.

The receptor-ligand union causes the production of second messengers that will activate effector proteins. Occurs an amplification of the signal.

• DIRECT ⇒ Occurs directly in the membrane.

Ionic channel proteins are activated and can change the chemical signal into an electric signal through ion flow.

When the molecule binds receptors that are associated with enzymes -or acting as enzymes- or to G proteins, it occurs a conformational change in the receptor cytoplasmic domain.

This change triggers an intracellular signal cascade in which many molecules participate and several chemical changes occur.  

According to this framework, all the options are correct,

• The receptor can open an ion channel in the cell membrane.

• The receptor can act as an enzyme causing chemical changes in the cytoplasm.

• The receptor can cause the formation of a second messenger.

So te correct option is Option D. All of the above.

You can learn more about membrane receptors at

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