The Feature of an Experiment That Is Changed from One

question 44

Multiple Choice

The feature of an experiment that is changed from one treatment to the next is referred to as a(n) :

• A)variable.
• B)control.
• C)test group.
• D)observation.

---

Definitions:

MHC Class I

MHC Class I molecules are proteins on the surface of cells that present peptide fragments to the immune system, crucial for the recognition of foreign pathogens.

Foreign Antigen

A substance from outside the body that triggers an immune response when detected by the body's immune system.

Immune System

The immune system is the body's defense mechanism against pathogens, consisting of a network of cells, tissues, and organs that work together to protect the body from disease.

Extracellular Antigens

Foreign substances outside cells that stimulate an immune response.