________ Is (Are) Protected by Barriers to Entry, Specifically ________

question 40

Multiple Choice

________ is (are) protected by barriers to entry, specifically ________.

• A) State lotteries; government rules
• B) DeBeers Company; economies of scale
• C) Cable companies; patents
• D) All of the above are correct.

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Definitions:

Steroids

A large class of organic compounds with a characteristic molecular structure containing four rings of carbon atoms; they include many hormones, alkaloids, and vitamins.

Intracellular Receptors

Proteins located inside the cell that bind to certain substances and initiate a specific cellular response.

First Messenger

A signaling molecule that binds to a receptor on the cell surface, initiating a signal transduction process that leads to the formation of an intracellular second messenger.

Ion Channel

An ion channel is a protein structure embedded in cell membranes that allows ions to pass through the membrane selectively.