Latest History of Micro Biology Multiple Choice Questions And Answers

81. Serum sickness reaction was discovered by
a. Marrice Arthus
b. Von perquit
c. Richet
d. Porter
Ans: B

82. Hybridoma technique was developed by
a. Kochler & Milston
b. Niel’s Jerne
c. Both a and b
d. None of these
Ans: C

83. Disease that effects many people at different countries is termed as
a. Sporadic
b. Pandemic
c. Epidemic
d. Endemic
Ans: A

84. If the vectors transmit the infection mechanically they are called
a. Biological vectors
b. Mechanical vectors
c. Biological reservoir
d. Both a and c
Ans: B

85. If a person can be infected by direct contact with infected tissue of another person, it is termed as
a. Indirect contact transmission
b. Attachment
c. Direct contact transmission
d. None of these
Ans: C

86. Reduction of virulence is known as
a. Exaltation
b. Attenuation
c. Both a and b
d. None of these
Ans: B

87. Enhancement of virulence is known as
a. Exaltation
b. Attenuation
c. Both a and b
d. None of these
Ans: A

88. The virulence of a pathogen is usually measured by
a. LD
b. MLD
c. ID
d. All of the above
Ans: D

89. The lethal dose required to kill 50% of the lab animals tested under standard called
a. ID
b. LD50
c. ID50
d. MLD
Ans: B

90. The most important virulence factors are
a. Adhesions
b. Invasiveness
c. Toxigenicity
d. Enzymes
e. All of the above
Ans: E

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