Which One of the Following Statements Regarding Positive and Negative

question 8

Multiple Choice

Which one of the following statements regarding positive and negative selection of T cells is NOT true?

• A)Thymic epithelial cells present self-peptide-MHC to developing T cells undergoing the selection process.
• B)T cells that do not recognize self-peptide-MHC die by neglect.
• C)T cells that bind too strongly to self-peptide-MHC die by Fas ligand-mediated apoptosis.
• D)During positive selection,developing T cells express higher levels of anti-apoptotic proteins such as bcl-2.
• E)A breakdown in negative selection may result in the development of some autoimmune diseases.

---

Definitions:

Variable Expense Ratio

The ratio of variable costs to total sales, indicating how variable expenses change with sales levels.

Contribution Format

A way of presenting an income statement where variable costs are deducted from sales to show contribution margin before fixed costs are subtracted to show net operating income.

Income Statement

An income statement is a financial document that summarizes a company's revenues, expenses, and profits over a specific period, showing its financial performance.

Selling Price

The amount charged to the customer for a product or service, determining the revenue generated from sales.