Which Best Describes the Cost-Benefit Results of the First 20

question 165

Multiple Choice

Which best describes the cost-benefit results of the first 20 years of the Clean Air?

• A)While costs have exceed benefits 2 to 1,benefits are expected to increase in the coming decades.
• B)Because many of the benefits of clean air are intangible,it is not possible to make such comparisons.
• C)Costs have been far greater than the benefits.
• D)In 2010,alone,estimated benefits exceeded costs by 4 to 1.

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Definitions:

Reverse Transcriptase

An enzyme that catalyzes the formation of DNA from an RNA template, used by retroviruses in their replication process.

Retroviruses

A group of RNA viruses that insert a DNA copy of their genome into the host cell to replicate, associated with certain cancers and HIV.

RNA Genome

The collection of RNA molecules that encode the genetic information of organisms whose chromosomes are composed of RNA, such as certain viruses.

mRNA

Messenger RNA, a type of RNA that carries genetic information from DNA to the ribosome for protein synthesis.