Use the Following Information When Answering the Corresponding Questions)

question 33

Multiple Choice

Use the following information when answering the corresponding questions) .
Rhodopsins are light- sensitive molecules composed of a protein opsin) and retinal derivative of vitamin A) . Opsin is a membrane protein with several a- 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. [
-Proteorhodopsin consists of a single polypeptide chain. What is the highest level of structure found in this protein?

• A) primary
• B) quaternary
• C) secondary
• D) tertiary

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Definitions:

Price Takers

Firms or individuals who accept the market price as is because they do not have enough market power to influence the price of the goods or services they sell.

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A concept in economics that indicates demand for a good or service decreases as its price increases, assuming all other factors remain constant.

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