Question

In: Biology

The Fab region of an antibody is highly variable. True False Toll-like receptors recognize certain bacterial...

The Fab region of an antibody is highly variable.

True

False

Toll-like receptors recognize certain bacterial molecules like peptidoglycan and lipopolysaccharide.

True

False

Antihistamines may be an effective treatment for a Type I – Immediate IgE mediated hypersensitivity.

True

False

The Fc region of an antibody is highly variable.

True

False

Natural Killer Cells are classified as lymphocytes that lack antigenic specificity.

True

False

B-cells never interact with free antigens.

True

False

Natural active immunity occurs when you are exposed to an infectious agent.

True

False

Solutions

Expert Solution

Ans 1 True

Reason

Antigen-binding fragment is described as the region present on an antibody. This region binds to antigens. As it binds to different antigen it is the variable region.

Ans 2 True

Toll-like receptor 2 (TLR2) are the are the receptor that recognize pathogen-associated molecular patterns that contains peptidoglycan and lipopolysaccharide.

Ans 3 True

Type I reactions which is also known as hypersensitivity reactions that contains immunoglobulin E (IgE), in this reaction histamine is released hence antihistamines are used.

Ans 4 False

Fc region of antibodies is same for the species hence they are considered as constant rather than variable.

Ans 5 True

NK cells does not express rearranged antigen receptors. They sense their environment by the receptors for cytokines, hence they are not antigen specific.

Ans 6 False

B cell interact with antigen that is bind to T-Cell receptor and not free antigen

Ans 7 True

Naturally active immunity develops when s person is exposed to a live pathogen hence statement is true.

gladiator answered 2 years ago
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