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Exposure to the HIV Virus Doesn't Necessarily Mean That a Person

question 47

Multiple Choice

Exposure to the HIV virus doesn't necessarily mean that a person will develop AIDS. Some people have genetic resistance to infection by HIV. Dr. Stephen O'Brien from the U.S. National Cancer Institute has recently identified a mutant form of a gene, called CCR5, that can protect against HIV infection. The mutation probably originated in Europe and became more prevalent among survivors of the bubonic plague. The mutated gene prevents the plague bacteria from attaching to cell membranes and, therefore, from entering and infecting body cells.
Although the HIV virus is very different from the bacteria that causes the plague, both diseases affect the exact same cells and use the same method of infection. The presence of the mutated gene in descendants of plague survivors helps prevent them from contracting AIDS. Pharmaceutical companies are using this information as the basis for a new approach to AIDS prevention. This could be very important in areas of the world where the mutation is scarce or absent, such as Africa.
-Which of the following shows the steps of a viral infection in the proper order?

Definitions:

Variable Costs

Costs that vary directly with the level of production or volume of output, such as materials and labor directly involved in production.

Contribution Margin

The amount by which sales revenue exceeds variable costs, used to cover fixed costs and contribute to profit.

Incremental Manufacturing Cost

The additional costs incurred to produce an additional unit of product, including materials, labor, and overheads.

Product Costs

Product costs are the costs directly associated with the production of goods, including direct materials, direct labor, and manufacturing overhead.