The Following Questions Refer to the Description Below

question 60

Multiple Choice

The following questions refer to the description below.
Malaria is a global health problem in over 100 countries, killing about one million people every year. The protist, Plasmodium, that causes malaria lives in 2 hosts, mosquitoes and humans. Malaria is transmitted to humans by the Anopholes mosquito.
-The use of DDT greatly decreased numbers of Anopholes mosquitoes in the 1960s, and drugs killed the Plasmodium. Now doctors tend to prescribe a combination of drugs against malaria. Why don't doctors prescribe a vaccine to combat malaria?

• A)In the presence of multiple drugs, the mutation rate of pathogens decreases.
• B)Multiple drugs enhance the immune system better than vaccines.
• C)Making an effective vaccine has proved to be difficult because Plasmodium lives inside the host's cells and continually changes its surface proteins.
• D)There are fewer side effects associated with using a combination of drugs compared with using a vaccine.
• E)Vaccines are more expensive than many drugs.

Understand the impact of drug use on memory and cognitive functions.

Distinguish between different classes of psychoactive drugs (stimulants, depressants, hallucinogens).

Recognize strategies and treatments for drug addiction.

Understand the biological basis for drug tolerance and withdrawal symptoms.

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Definitions:

Net Profit Margin

A profitability ratio calculated by dividing net income by revenue, expressing how much profit a company makes for every dollar of sales.

Gross Profit Percentage

A financial metric that represents the proportion of money left over from revenues after accounting for the cost of goods sold (COGS), expressed as a percentage.

Net Profit Margin

Net profit margin is a financial ratio that shows what percentage of a company's revenues remain as net income after all expenses are deducted.

Earnings Per Share

A financial ratio that measures the portion of a company’s profit allocated to each outstanding share of common stock, indicating company profitability.