Category Archives: Microbiology MCQ

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Infection Process – Penetration of Epithelial Cell Layers”. 1. Which of the following microorganism causes infection in burns? a) Pseudomonas aeruginosa b) Clostridium perfringens c) Borrelia sp d) Streptococcus sp 2. V. cholerae does not penetrate into the body. a) True b) False … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Infection Process – Microbial Adherence”. 1. Degree of pathogenicity is referred to as _________________ a) infection b) virulence c) avirulent d) attenuated 2. Which type of strains are used in vaccines? a) virulent b) avirulent c) attenuated d) non-pathogenic 3. The LD50 dose … Read more

This set of Microbiology online quiz focuses on “Microbial Flora of Healthy Human Host – Distribution and Occurrence of the Normal Flora”. 1. Which of the following viruses are termed as ‘orphan’ viruses? a) retroviruses b) echoviruses c) coxsackieviruses d) adenoviruses 2. Bacteria can be grown on the dry surface of skin. a) True b) … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Normal Flora and the Human Host”. 1. Who among the following was successful in raising 17 germ-free chickens for 40 days? a) Pasteur b) Schottelius c) Cohendy d) Reyniers 2. Within how many days after birth a stable flora develops? a) 1 day … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Bacterial Transformation”. 1. What are the characteristics of rough pneumococci strain? a) noncapsulated and pathogenic b) noncapsulated and nonpathogenic c) capsulated and pathogenic d) capsulated and nonpathogenic 2. In Griffith’s experiment which of the following strains of pneumococci was isolated from dead mice? … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Bacterial Transduction”. 1. How much time is taken by the new DNA to make whole phage particles? a) 24 hours b) 60 mins c) 2 mins d) 10-20 mins 2. When viral genome can become integrated into the bacterial genome they are known … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Bacterial Conjugation”. 1. The first demonstration of recombination in bacteria was achieved by _______________ a) Lederberg and Tatum b) Luria and Delbruck c) Joshua and Lederberg d) Luria and Tatum 2. Mating between species is necessary for recombination to take place. a) True … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Bacterial Recombination”. 1. The transfer of genes from one cell to another by a bacteriophage is known as __________________ a) Recombination b) Conjugation c) Transduction d) Transformation 2. Genetic recombination occurs between homologous chromosomes. a) True b) False 3. Bacterial recombination causes transformation … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Genotypic Changes”. 1. Bacterial chromosome has the capacity to code for ____________ different proteins. a) 900 b) 300 c) 1500 d) 3500 2. Which is the functional unit of inheritance? a) DNA b) Chromosome c) Gene d) RNA 3. Populations of cells descending … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Industrial Uses of Molds”. 1. Gluconic acid is produced by which of the following molds? a) Aspergillus niger b) Rhizopus nigricans c) Aspergillus terreus d) Rhizopus oryzae 2. Fermentation of rice is carried out by which of the following microorganisms? a) bacteria b) … Read more