How Does Halorhodopsin (NpHR) Inactivate Neurons

question 30

Multiple Choice

How does halorhodopsin (NpHR) inactivate neurons?

• A) Halorhodopsin is activated by blue light, which causes a nonselective cation current which allows more K⁺ efflux than Na⁺ influx, hyperpolarizing the neuron.
• B) Halorhodopsin is activated by blue light, which results in increased permeability to chloride, effectively silencing the cells.
• C) Halorhodopsin is activated by yellow light, which causes a nonselective cation current which allows more K⁺ efflux than Na⁺ influx, hyperpolarizing the neuron.
• D) Halorhodopsin is activated by yellow light, which results in an increased transportation of chloride across the membrane, effectively silencing the cells.

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