🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

Anthracnose is a defect which can be observed asAnswer: All of these Stem and rots caused by species of molds involveAnswer: Stem ends of fruits Species of __________ are predominant on thawing vegetables like sweet corn and peas when the temperature of thawing is fairly low.Answer: Micrococcus Under what conditions food poisoning bacteria may grow and produce toxins in vegetables?Answer: When thawed vegetables are held at room temperature for any considerable period Bacterial soft rot is caused due toAnswer: Fermentation of pectin Saprophytic bacteria causeAnswer: Sliminess or souring in piled, wet and heating vegetables The micro-organism which is present in both fresh and frozen juices isAnswer: Entereobacter aerogenes Most spoilage bacteria grow atAnswer: Neutral pH The microbiological examination of coliform bacteria in foods preferably useAnswer: All of these Which of the following acid will have higher bacteriostatic effect at a given pH?Answer: Acetic acid Which of the following is not true for the thermal resistance of the bacterial cells?Answer: Cells low in lipid content are harder to kill than other cells Water activity can act asAnswer: All of these Enumeration of microorganism refers toAnswer: Either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar, or non-selective plate, depending on the test The different ACC's between food categories reflect theAnswer: All of these Examination of the presence / absence of organisms refers toAnswer: Incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium. Plate count of bacteria in foods generally use the plating medium consisting ofAnswer: Peptone, yeast extract, glucose, sodium chloride, agar and distilled water What are the intrinsic factors for the microbial growth?Answer: All of these Yeast and mould count determination requires-Answer: Acidified potato glucose agar The time temperature combination for HTST paterurization of 71.1°C for 15 sec is selected on the basis ofAnswer: Coxiella Burnetii Aerobic Colony Count (ACC), is also known asAnswer: All of these Which of the following is true about ISO 2002 method for Salmonella detection?Answer: All of these Suspected colonies of Staphylococcus aureus when grown on Baird-Parker medium shall showAnswer: Coagulase activity A psychrophilic halophile would be a microbe that prefersAnswer: Cold temperatures and increased amounts of salt NaCl can act asAnswer: Both Which of the following was the first amino acid to be produced commercially?Answer: L-lysine The Candida species require fermentation equipment lined with plastic because they are extremely sensitive toAnswer: Traces of iron Cycloserine may be isolated from the cultures ofAnswer: All of these The first penicillin isolated by Alexander Fleming, penicillin F is also calledAnswer: 2-Pentenyl Penicillin It is mandatory that cultures and fermentation residues be sterilized before discard in case ofEremothecium ashbyii and Ashbya gossypii because they areAnswer: Plant pathogens Which of the following when used in proper concentration stimulates the Ascomycetes fermentation of vitamin B₁₂ and can be used to counteract toxicity of iron in Candida species?Answer: Co