Question

56. The main cause of Staphylococcus food poisoning is                                                                                                                  

A. preformed endotoxin                                                                                                                                                                                                                                                                                                                                                                                                  B. preformed exotoxin                                                                                                                                                         

C. multiplication of bacteria from resting spores                                                                                                            

D. production of neurotoxins after ingestion of food

57. The main purpose of the early viral genes that are expressed is to                                                                 

A. take over the host machinery              

B. synthesize nucleic acids                                                                   

C. to uncoat the virus                                 

D. to cause disease                                                                                 

E. make the protein coat                           

F. none of these

58. Microorganisms might be virulent (i.e., be capable of causing infectious diseases)                                                                        

A. because of the presence of anatomical structures such as pili.                                                                                   

B. because of production of exotoxins or endotoxins.                                                                                                                 

C. because of production of various enzymatic activities such as hemolysins and leucocidins.                                           

D. all of the above.

Answer 1

56. Staphlylococcus aureus is a Gram positive bacterium which is responsible for causing food posioning. It is due to toxins produced by the bacterium. These toxins are mainly preformed exotoxins, which are present in food due to enterotoxigenic strains of Staphylococcus.

Hence, the correct option is (B)

57. The early viral genes in virus are made to first convert into early viral proteins. The early proteins are the responsible for the replication of viral genome; and are therefore needed for synthesis of viral nucleic acids.

Hence, the correct option is (B)

58. The virulence of the microorganisms can be held possible by the various virulent factors such as pili, various types of toxins (exotoxin or endotoxin) and enzymes (hemolysins and leucocidins). They all are responsible for virulence.

Hence, the correct option is (D)

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