Which Statement Is True

question 127

Multiple Choice

Which statement is true?

• A) There is little polymorphism at MHC loci in humans.
• B) Cytotoxic T cell receptors recognize antigenic fragments only when they are bound to class II MHC molecule.
• C) T-helper cells have a surface protein that binds to antigen‒class I MHC complexes.
• D) Cytotoxic T cells use a protein called CD8 to ensure binding to an MHC-antigen complex.
• E) T-helper cells bind to pathogens that display cell surface antigens.

---

Definitions:

Coarse Rhonchi

Low-pitched, rattling lung sounds that suggest blockage or secretions in the large airways; often heard in conditions such as chronic bronchitis.

Field Of Vision

The entire area that an individual can see without moving the eyes, important in diagnosing and treating eye conditions.

Expressive Aphasia

A condition affecting speech production and the ability to write, typically resulting from damage to the brain's language regions.

Receptive Aphasia

A language disorder marked by difficulty understanding spoken or written language, often caused by damage to the brain's language areas.