A Nonfunctional CD4 Protein on a Helper T Cell Would

question 29

Multiple Choice

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to ________.

• A) respond to circulating viral antigens
• B) lyse tumour cells
• C) stimulate a cytotoxic T cell
• D) interact with a class II MHC-antigen complex

---

Definitions:

Electrophilic Aromatic Substitution

A reaction where an aromatic ring undergoes substitution by an electrophile, retaining the aromaticity of the compound.

Nitration

A chemical reaction that introduces a nitro group (NO2) into an organic compound, usually involving the substitution of an H atom, often used to synthesize explosives or other nitro compounds.

Anisole

An organic compound consisting of a methoxybenzene group, used as a precursor in the synthesis of other chemicals.

Ortho

In chemistry, a designation used in nomenclature to indicate adjacent or 1,2- substitution in the structure of benzene ring compounds.