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

question 39

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.]
-Proteorhodopsin consists of a single polypeptide chain.What is the highest level of structure found in this protein?

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Definitions:

Operating Activities

The primary revenue-generating activities of a business which include production, sales, and delivery of the company’s main goods and services.

Accrual Basis

An accounting method where transactions are recorded when they are earned or incurred, regardless of when cash is exchanged, offering a more accurate financial picture.

Cash Basis

An accounting method where revenues and expenses are recorded when they are actually received or paid, not when they are incurred.

Cash Receipts

The total amount of cash received by a business during a specified period.