A Scientist Reports the Isolation of a New Blood-Borne Virus

question 56

Multiple Choice

A scientist reports the isolation of a new blood-borne virus that completely shuts down presentation of viral epitopes on MHC molecules in the cells it infects.He produces an internet video describing it and how it will be indestructible by CD8+ cytotoxic T cells and will kill millions (if not billions) of people.The medical community quickly denounces the dire warning as irrevlevant,and the whole thing is quickly forgotten-why?

• A)CD8+ T cells are not the cells that are responsible for killing virally infected cells.The terrorist mad scientist is a misinformed idiot.
• B)While CD8+ T cells ARE important for eliminating a viral infection,they are not the ONLY things that are capable of doing so.Natural killer cells can kill virally infected cells that have shut down MHC antigen presentation,and interferons can assist in cleaning virally infected cells.
• C)A blood-borne virus would not be capable of rapidly infecting millions of people,due to its difficult mode of transmission.
• D)B cells would be primed right away to produce complement proteins to destroy the virus.This would prevent cells from being infected with it in the first place.His plot would be foiled.
• E)While CD8+ T cells ARE important for eliminating a viral infection,they are not the ONLY things that are capable of doing so.Natural killer cells can kill virally infected cells that have shut down MHC antigen presentation,and interferons can assist in cleaning virally infected cells AND a blood-borne virus would not be capable of rapidly infecting millions of people,due to its difficult mode of transmission.

Comprehend the concept and analytical use of Lorenz curves in illustrating income distribution.

Analyze the trends in poverty rates over specific historical periods.

Recognize the ideological differences between conservatives and liberals regarding the causes and solutions to poverty.

Grasp the significance of income shares across different segments of the population.

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Definitions:

Z-test

A Z-test is a statistical test used to determine whether two population means are different when the variances are known and the sample size is large.

Population Means

The average of a set of measurements, scores, or values for the entire population.

Pooled Variance

An estimate of the common variance of two or more groups that is weighted by the degrees of freedom of each group.

Standard Error

The standard deviation of the sampling distribution of a statistic, often used to quantify the accuracy of a sample mean.