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

question 47

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.]
-A membrane protein that spans the phospholipid bilayer one or more times is ________.

• A) a transmembrane protein
• B) an associated protein
• C) a peripheral protein
• D) an integrin
• E) a glycoprotein

Identify and explain the free-rider problem associated with public goods.

Explain the concept of the optimal level of provision for public goods.

Understand the principles behind the Tiebout hypothesis and Samuelson's theory of public expenditure.

Recognize and explain the drop-in-the-bucket problem.

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