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Unlike signal transduction in many other sensory receptors, signal transduction in rods?
a. results in hyperpolarization of the sensory cell.
b. does not involve the participation of a G protein.
c. takes place entirely in the plasma membrane.
d. involves a second messenger.

Respuesta :

Option A. Results in hyperpolarization of the sensory cell. In signal transduction in rods, the Rhodesian protein of the rod photoreceptor absorbs light, which leads to a conformational change in the protein.

Signal Transduction in Rod Photoreceptors: Hyperpolarization of the Sensory Cell

  • Option A. Results in hyperpolarization of the sensory cell.

When the Rhodopsin protein absorbs light, it activates a G-protein called transducin. This then activates an enzyme called phosphodiesterase, which hydrolyses a molecule called cGMP. The decrease in cGMP causes the membrane potential of the rod photoreceptor to become more negative, which is known as hyperpolarization. This hyperpolarization produces an electrical signal that is sent to the brain and enables us to detect light.

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