The Final Stages of T Cell Development Occur in the Thymic

question 19

Multiple Choice

The final stages of T cell development occur in the thymic medulla, after the developing cells become CD4 or CD8 single-positive. One important change that occurs during this final maturation is:

• A) The down-regulation of the pre-T-cell receptor \(\alpha\) (pre-T\(\alpha\)) chain protein
• B) The up-regulation of genes encoding effector cytokines and cytolytic effector proteins
• C) The increased susceptibility to T-cell receptor-induced apoptosis
• D) The loss of susceptibility to T-cell receptor-induced apoptosis
• E) The up-regulation of signaling proteins required for T cell activation

---

Definitions:

Monopoly Firms

Entities that are the sole providers of a product or service in a market, facing no competition.

Downward-Sloping

A term often used in economics to describe a line or curve on a graph that demonstrates a decrease in one variable as another increases.

Demand Curve

A graph showing the relationship between the price of a good and the quantity of the good that consumers are willing and able to purchase at each price.

Perfectly Elastic

Refers to a situation in which the quantity demanded or supplied changes infinitely in response to any change in price.