Q. No.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.
Many physicians prefer mother's milk over cow's milk for infants. This is because mother's milk has the following property not found in cow's milk.
(1) Antibodies against human disease
(2) Proteins for growing human muscle
(3) More essential amino acids
(4) MHCs for maturing the infant's immune system
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. |
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.
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
When searching for a donor for an organ transplant, doctors try to match the __________ of the donor and recipient as closely as possible.
(1) antibodies
(2) blood type
(3) MHC proteins
(4) Leukocytes
In a series of immune system experiments, the thymus glands were removed from baby mice. Which of the following would you predict as a likely result?
(1) The mice suffered from numerous allergies.
(2) The mice never developed cancerous tumors.
(3) The mice suffered from autoimmune diseases.
(4) The mice readily accepted tissue transplants.
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. |
Chemicals produced by virus-infected cells that alert neighboring cells to prepare a defense are called:
(1) antibodies
(2) interferons
(3) cytokines
(4) antigens
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