University:
Kentucky State University
Course:
BIO 302 | General Microbiology
Academic year:

2019
Views:

472

Pages:

2
Author:

Caroline Mcfarland

Microbiology 1-Which of the following toxins can cause scarlet fever? a. DNAse b. Streptolysin S c. Hyalinase d. C5a protease e. Erythrogenic toxin 2-Which of the following statements concerning antigenic drift in influenza viruses is correct? a. It results in major antigenic changes b. It is exhibited only by influenza A viruses c. It is caused by frameshift mutations in viral genes d. It results in new subtypes over time e. It affects predominantly the matrix protein 3-Highly pathogenic H5N1 avian influenza HPAI can infect humans with a high mortality rate, but it has not yet resulted in pandemic. The following are characteristics of HPAI, except for one. Which one is not? a. Efficient human-to-human transmission b. Presence of avian influenza genes c. Efficient infection of domestic poultry d. Contains segmented RNA genome e. Both high pathogenicity and low pathogenicity avian influenza viruses can cause disease in human beings 4-All of the following are true about S. pyogenes except: a. Can’t be diagnosed by smear b. Available vaccine against its capsule c. Treated by penicillin with no resistance d. The capsule is an important virulence factor ANSWERS 1 2 E D 3 4 A B