Foreign molecules that elicit an immune response are called
a. ma...

Question

Foreign molecules that elicit an immune response are called
a. major histocompatibility complex (MHC) molecules.
b. antibodies.
c. histamines.
d. antigens.

Accepted Answer

Hi everyone. Let's look at our next problem. It says the part of the antigen that the immune system recognizes and to which antibodies bind is called blank. Was he here that remember that? We're thinking about the part on the antigen? Not the region on the antibody and the region on the antigen that antibodies bind to is choice see an epic tope. So that's that specific reason region that the antibody binds to. So when we look through other answers, answer choices, we see the choice A is an antigen receptor. Well this would be the site that binds to the epic tope uh the antigen receptors and antibody protein anchored to the B. Cell membrane that binds to the epitope. So not what we're looking for. Since we're looking for the portion on the antigen itself. And then finally we've got choice be a constant region and choice the a variable region. And if we want to think about those then let's think about the structure of the antibody itself. Because these are also part of the antibodies rather than antigen. There's a little brief rough diagram of an antibody with its two antigen binding sites here and here. Uh The variable portion of this region up here that can be changed to allow it to very specifically bind to antigens with the constant portion of the base here. So the variable region constant region are not our answer choices because they are part of the antibody structure, not part of the antigen. So the part of the antigens and the immune system recognizes And antibodies bind is choice C. And tube. See you in the next video.

Foreign molecules that elicit an immune response are called a. major histocompatibility complex (MHC) molecules. b. antibodies. c. histamines. d. antigens.

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