All of the Following Protein-Protein Interactions Are Involved in Activation

question 10

Multiple Choice

All of the following protein-protein interactions are involved in activation of naive helper T cells by antigen-presenting cells (APCs) EXCEPT binding of:

• A) Peptide-MHC complexes on the APC to the TCR on the T cell
• B) CD4 on the T cell to nonpolymorphic regions of class II MHC molecules on the APC
• C) Integrins on the T cell with adhesion ligands on the APC
• D) B7-2 on the APC with CD28 on the T cell
• E) CD40L on the T cell with CD40 on the APC

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Definitions:

Economic Cost

The total cost of choosing one action over another, including both direct costs and any lost opportunity costs.

Alcohol Abuse

The harmful or hazardous use of alcohol that leads to health issues, social problems, or both.

Alcohol Dependence

A medical condition characterized by an impaired ability to stop or control alcohol use despite adverse social, occupational, or health consequences.

Barbiturates

A class of drugs that act as central nervous system depressants, historically used for anxiety, insomnia, and seizure disorders, but now less common due to risks of dependence.