8)Clostridium perfringens may be found as a part of the normal flora in: a) Mout

Question

8)Clostridium perfringens may be found as a part of the normal flora in: a) Mouth b) Intestines c) Lungs d) Urinary tract e) Wounds

10)Foreign substances that induce a specific immune response after gaining entrance to the body are termed: a) Antigens b) Antibodies c) Cytolysins d) Complement e) None o the above

11)Essential prperties of an antigen are: a) It must be foreign to the host b) It must be degradable by the host c) It must be a large molecule and possess at least two different determinant groups d) It must posses a three-dimentional or tertiary structure e) All of the above

13)quantitatively the largest class of immunoglobulins in human serum is: a) IgG b) IgA c) IgM d) IgD e)IgE

14)Which of the following statements are applicable to IgM immunoglobulins: a) They are the antibodies first to be detected after injection of an antigen b) In the presence of complement, they are highly lethal to gram-negative bacteria c) They play an important protective role during the early stages of infection d) All of the above e) None of the above

16)Today antiserum is mainly used for: a) Temporary prevention of certain viral infections b) Neutralization of certain potent bacterial toxins c) Treatment of hepatitis patients d) Only A and B above e) None of the above

Explanation / Answer

8. Clostridium perfringens may be found as a part of the normal flora in Intestines. Option b is correct. C.perfringens occur as a normal flora in the intestinal tract of humans and may cause gas gangrene due to food poisoning.

10. Foreign substances that induce a specific immune response after gaining entrance to the body are termed: a) Antigens. Option a is correct. The body produces antibodies against the foreign substances or antigens.

11. Essential prperties of an antigen are: a) It must be foreign to the host. Option a is correct. In many cases the antigens are degraded or neutralized by the host.

13. quantitatively the largest class of immunoglobulins in human serum is IgA. Option b is correct. This is because IgA is found in primary immune response and in secretions like lacrimal secretions, sweat, tears and breast milk.

14. IgM immunoglobulins are highly lethal to gram negative bacteria in presence of complement proteins. Option b is correct.

16. Today antiserum is mainly used for: a) Temporary prevention of certain viral infections b) Neutralization of certain potent bacterial toxins. Option d is correct.

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