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Which of the following is true of B cells? Select one: a. They differentiate into macrophage b. They present antigens c. They are responsible for cell mediated immunity d. They secrete cytokines Suppose an individual has impaired histamine release from mast cells. This individual may have lower levels of which antibody class? Select one: a. IgA X c. IgE d. IgM Identify the component that is NOT part of innate immune defenses. Select one: a. skin b. cytotoxic T cells c. toll-like receptors d. mucous .
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Answer #1

1. Correct answer:- (b) they presents antigen
Explanation:- B cells are antigen presenting cells in modified form.
(a) B cells differentiate into plasma cell not in macrophages.

2. Correct answer:- (c) IgE
Explanation:-- mast cell mediates IgE.


3. Correct answer:- (b) cytotoxic T cell
Explanation:- innate immunity refers to nonspecific defense mechanisms that come into play immediately of an antigen's attack in the body. -These mechanisms include physical barriers such as skin, chemicals in the blood, mucous and cells like natural killer cells and toll like receptors.
- cytotoxic T cells are adaptive immunity.

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