You Are Studying the Transport of a Particular Substance into Epithelial

question 61

Multiple Choice

You are studying the transport of a particular substance into epithelial cells grown in culture. You notice that you can only find the substance inside the cell when ATP is present. How is the protein moving through the membrane?

• A)diffusion
• B)facilitated diffusion
• C)passive transport
• D)active transport

---

Definitions:

Natural Monopolist

A company that can provide goods or services at a lower cost than any competitors can, due to economies of scale, often leading to a monopoly in the market.

Natural Monopoly

A scenario in the marketplace where only one company can offer a product or service more affordably than any would-be rival, frequently because of the cost advantages associated with large-scale operations.

Marginal Cost

The change in total cost that arises when the quantity produced changes by one unit; essentially the cost of producing one more unit of a good.

Government Operation

Activities carried out by the government, including regulation, provision of public services, and maintenance of law and order.