Use the Following Information When Answering the Corresponding Question(s)

question 9

Multiple Choice

Use the following information when answering the corresponding question(s) .
Rhodopsins are light-sensitive molecules composed of a protein (opsin) and retinal (derivative of vitamin A) . Opsin is a membrane protein with several α-helical segments that loop back and forth through the plasma membrane. There are two classes of rhodopsins. According to Oded Beje, one class has relatively slow dynamics (a photocycle of approximately 0.5 second) and is well suited for light detection. The second class has faster dynamics (a photocycle of approximately 0.02 seconds) and is well suited for chemiosmosis: pumping of protons or chloride ions across cell membranes. Oded Beje was the first, in September 2000, to report on a rhodopsin (proteorhodopsin) found in the domain Bacteria. [SOURCE: O. Beje et al., Science 289 (2000) : 1902.]
-Refer to the paragraph on rhodopsins. Which of the following best describes this particular protein?

• A) integral
• B) peripheral
• C) external
• D) internal

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Definitions:

Income Effect

Shifts in economic or personal income and how these shifts influence the demand for certain goods or services.

Disparity of Income

The gap in income and wealth distribution among individuals or groups within a society, leading to economic inequality.

Nominal Wages

The amount of money paid to employees without adjustment for inflation, reflecting the face value rather than the real purchasing power.

Real Wages

The buying capacity of earnings, when accounted for inflation, showing the amount of goods and services that can be purchased.