Which Is the Correct Order of the Series of Reactions

question 16

Multiple Choice

Which is the correct order of the series of reactions set in motion when a rhodopsin molecule is activated?

• A) Activation of G protein,photon absorption,second messenger diffusion,closing of Na⁺ channels
• B) Activation of G protein,second messenger diffusion,photon absorption,closing of Na⁺ channels
• C) Closing of Na⁺ channels,activation of G protein,photon absorption,second messenger diffusion
• D) Closing of Na⁺ channels,activation of G protein,second messenger diffusion,photon absorption
• E) Photon absorption,activation of G protein,second messenger diffusion,closing of Na⁺ channels

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Definitions:

Postsynaptic Cell

The neuron or cell that receives a signal (neurotransmitters) from another neuron at a synapse.

Neurotransmitter

Chemicals released by neurons at synapses, which transmit signals across a chemical synapse from one neuron to another neuron, muscle cell, or gland cell.

Inhibitory Local Potential

A type of synaptic potential that makes a postsynaptic neuron less likely to generate an action potential.

Plasma Membrane

A biological barrier that demarcates the internal space of every cell from the external world, overseeing the transport of elements entering and exiting the cells.