October 2022

Q. All of the statements regarding Bacillus anthracis are true, Except The causative agent of smallpox Nonhemolytic colonies appear on Blood agar Commonly transmitted from animals to humans Endospore-forming bacteria Answer: The causative agent of smallpox

Q. Clostridium perfringens on agar can show all of the following cultural characteristics, Except? Microaerophilic Spore-forming H2S production Haemolysis (alpha and beta) Answer: Microaerophilic

Q. Which of the bacteria consists of flagella and shows a positive motility test? Staphylococcus aureus Yersinia pestis Klebsiella pneumoniae Proteus vulgaris Answer: Proteus vulgaris

Q. All of the following bacteria are catalase positive, Except E. coli Shigella spp Staphylococcus spp Streptococcus spp Answer: Streptococcus spp

Q. The metabolic reactions are shown by different bacteria help in the identification and classification of bacteria, which of the following biochemical tests show a negative result for Escherichia Coli? Lactose Indole Citrate Glucose Answer: Citrate

Q. All of the following are common stains used in the microbiology laboratory, Except: Bismarck brown Lactophenol cotton blue Ziehl – Neelsen stain Crystal violet Answer: Bismarck brown

Q. Gram staining technique is used for the differentiation of gram-positive and gram-negative bacteria. What color do gram-negative bacteria show when observed under the microscope after the staining procedure? Blue Pink Purple d)Green Answer: Pink

Q. Which of the following dye is commonly used for the Negative staining technique? Crystal violet India ink Lactophenol cotton blue Periodic acid- Schiff stain Answer: India ink

Q. A bacteriological stain also known as the differential stain is used for the identification of acid-fast organisms, what is the name of the stain? Negative stain Gram stain Ziehl-Neelsen stain Schaeffer Fulton stain Answer: Ziehl-Neelsen stain