Select the Pathway That Would Lead to the Activation of Cytotoxic

question 82

Multiple Choice

Select the pathway that would lead to the activation of cytotoxic T cells.

• A) B cell contact antigen → helper T cell is activated → clonal selection occurs
• B) body cell becomes infected with a virus → new viral proteins appear → class I MHC molecule-antigen complex displayed on cell surface
• C) self-tolerance of immune cells → B cells contact antigen → cytokines released
• D) complement is secreted → B cell contacts antigen → helper T cell activated → cytokines released
• E) cytotoxic T cells → class II MHC molecule-antigen complex displayed → cytokines released → cell lysis

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Definitions:

Genetic Drift

A random change in allele frequency in a small breeding population.

Genetic Bottleneck

A sharp reduction in the size of a population due to environmental events or human activities, which leads to a decrease in genetic diversity.

Founder Effect

Genetic drift that results from a small population colonizing a new area.

Frequency-Dependent Selection

Frequency-Dependent Selection refers to an evolutionary process by which the fitness of a phenotype or genotype depends on its frequency relative to other phenotypes or genotypes in the population.