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.

---

Definitions:

Consumer Price Index

A measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care, used to estimate inflation.

APR

Annual Percentage Rate, a measure that reflects the cost of borrowing on loans or credit cards or the yield from an investment, including interest and other fees.

Compounded Monthly

The process of adding interest to the principal sum of a loan or deposit, or in other words, interest on interest, calculated on a monthly basis.

Retirement Account

A financial account that is specifically designed to save funds for retirement, offering tax benefits for money invested and saved.