Immunology homework help please?? 1 Antigen used in precipitin-type reactions ar

Question

Immunology homework help please??

1 Antigen used in precipitin-type reactions are referred to as being:

a. Soluble

b. Cellular

c. Particulate

d. Insoluble

e. A and C only

f. None of the above

2 Which of the following is not immunogenic?

a Free protein

b Nucleoproteins

c Glycoproteins

d Lipids

e Polysaccharide

f None of the above

3 An opsonizing antibody has the function of:

a Neutralizing toxins

b Enhancing phagocytosis

c Lysing bacteria

d Antigen agglutination

e None of the above

4 Which of the following is usually an in vivo antibody test?

a Neutralizing

b Agglutination

c Precipitation

d Complement fixation

e None of the above

5 An Ab molecule has the distinguishing characteristics of beings>?

a Noncovalent

b Nonspecific

c Multivalent

d Multispecific

e None of the above

f B and C only

g A and D only

6 In the indirect immunoflourescent test for identification of a specific human infectious organism, FITC is conjugated to:

a The microorganism

b Antibody specific to the microorganism

c Antibody specific to human gamma globulin

d None of the above

7 Immune competent B-cells:

a Can be T-independent cells

b Can collaborate with T-cells if needed

c Have surface immunoglobulin for antigen

d Are morphologically distinguishable from plasma cells

e All of the above

f None of the above

8 The clonal-selection theory of Ab formation implies that:

a Antigen enters the antibody-producing B-lymphocyte and becomes a direct template from which the Ab takes is final complementary force

b Clonal deletion occurs in which B-lymphocytes are destroyed following contact with antigen

c The B-lymphocyte is genetically programmed with a surface receptor pattern complimentary to the specific Ag, and the Ag combine with the Ig receptor that has the right complementary pattern

d The Ag incorporation an image of itself in the genetic nucleus of the B-lymphocyte

e All of the above

9 A lack of T-suppressor cells may explain:

a The formation of Ab-antigen self Ag

b The formation of Ab against not-self Ag

c Auto immune disease

d A and C only

e B and C only

f All the above

Explanation / Answer

1. a. Soluble

2. d Lipids

3. b Enhancing phagocytosis

4. a Neutralizing

5. g A and D only

6. c Antibody specific to human gamma globulin

7. e All of the above

8. c The B-lymphocyte is genetically programmed with a surface receptor pattern complimentary to the specific Ag, and the Ag combine with the Ig receptor that has the right complementary pattern

9. d A and C only.

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