Q. No.The epitope is the part of the :
1.
antibody that binds to the antigen.
2.
antibody that binds to the T helper cell.
3.
antigen that is bound by the antibody.
4.
hypervariable region of the antibody.
What type of immunity is induced by the hepatitis B vaccine?
1. naturally acquired active immunity.
2. naturally acquired passive immunity.
3. artificially acquired active immunity.
4. artificially acquired passive immunity.
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Besides helper T cells, what are two other types of cells that HIV infects?
1. macrophages and brain cells
2. B cells and liver cells
3. plasma cells and neutrophils
4. cytotoxic T cells and brain cells
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The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions. Why are these regions described as variable?
| 1. | They can change their shapes to fit different antigens. |
| 2. | They change their shapes when they bind to an antigen. |
| 3. | Their specific shapes are unimportant. |
| 4. | The amino acid sequences of these regions vary widely among antibodies from different B cells. |
Opsonization :
| 1. | is the killing of target cells by cytotoxic T cells. |
| 2. | is the secretory component of IgA. |
| 3. | helps increase phagocytosis. |
| 4. | is the interaction that allows IgG to cross the placenta. |
IgM:
| 1. | has five antigen-binding sites. |
| 2. | has the ability to cross the placenta. |
| 3. | attaches to mast cells and basophils. |
| 4. | has five constant regions. |
All of the following are true regarding inflammation except:
| 1. | The same sequence of events occurs in response to any injury, whether it be a burn, an infection, or trauma. |
| 2. | The signs of inflammation are pain, redness, swelling, heat, and possibly loss of function. |
| 3. | Cytokines, histamine, complement, and other chemical mediators are released. |
| 4. | Monocytes are the first cells to arrive from the bloodstream at the site of inflammation. |
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Plants do not have cancers as:
| 1. | they do not have circulation |
| 2. | they have highly developed immunity against them |
| 3. | the plant cells have cell walls |
| 4. | they already have meristems at their tips |
Philadelphia chromosome is associated with:
1. Retinoblastoma
2. Chronic Myeloid Leukemia
3. Xerodermapigmentosum
4. Kaposi’s sarcoma
Which of the following is not a documented effect of alcoholism?
| 1. | intrauterine growth retardation in the fetus if the pregnant female consumes alcohol. |
| 2. | cirrhosis of the liver secondary to fatty deposition in the liver. |
| 3. | an increase in the secretion of ADH by the supraoptic nucleus of the hypothalamus. |
| 4. | gastritis and pancreatitis. |
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