How Are Natural Killer (NK) Cells Different from Cytotoxic T

question 27

Multiple Choice

How are natural killer (NK) cells different from cytotoxic T (TC) cells?

• A) NK cells induce apoptosis in their target cells, whereas TC cells are professional phagocytes.
• B) NK cells kill virus-infected cells, whereas TC cells kill cancerous cells.
• C) NK cells kill cells with a high level of class I MHC protein expression, whereas killing by TC cells requires low expression levels.
• D) NK cells respond quickly to a virus infection, whereas the activation of TC cells to become cytotoxic is a slow process.
• E) NK cells are normally abundant in the tissue even before infection, whereas TC cells are mostly in the bloodstream.

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Definitions:

Efficacy

The ability to produce a desired or intended result, often used in the context of medications or therapeutic interventions.

Meta-Analysis

A method of quantitatively summing up previous research studies that have used different patient populations and outcome measures. The research results are combined by developing a common metric called an effect size.

Technique

A systematic procedure, method, or approach used in a particular field or for a specific purpose to achieve desired results.

Importance

The degree of significance or value assigned to something, indicating its worth or priority in a particular context.