Question

A receptor that binds to a ligand at very low concentrations has a ________.

1) high dissociation constant.
2) low Ka.
3) high affinity for the ligand.
4) low affinity for the ligand.

Answer 1

A receptor that binds to a ligand at very low concentrations has a high affinity for the ligand.

Step-by-step explanation:

A receptor that binds to a ligand at very low concentrations has a high affinity for the ligand. This means that the receptor has a strong attraction to the ligand and is more likely to be occupied even at low concentrations of the ligand. It requires a large value of equilibrium constant (K) for a receptor to have high affinity for a ligand.