🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Pectinase, an enzyme used for increasing yield and for clarifying juice is obtained byAnswer: All of these The 95% ethanol is equivalent toAnswer: 190 proof Which species from the followings is resistant to methyl tryptophan?Answer: B. subtilis Which of the following substance is employed to neutralize the lactic acid as it is produced (because lactic acid bacteria do not tolerate high concentrations of acid?Answer: CaCO₃ Alcohol production from starch and raw sugar utilizes selected strains ofAnswer: Saccharomyces cerevisiae Fungal amylases using stationary culture with wheat bran utilizesAnswer: A. oryzae Why high concentration of sugars are not employed in the fermentation medium?Answer: Calcium lactate crystallizes from the medium and slows down the process of fermentation Which of the following organism produces enzyme taka diastase?Answer: A. oryzae Which of the following is not an industrial product made by the fungus Aspergillus niger?Answer: Lysine The biotin level in obtaining L-gluatmic acid by fermentation usingMicrococcus glutamicus is critical becauseAnswer: Both Most productive species among the different vitamin B12 producing Pseudomonads isAnswer: P. denitrificans The enzyme which converts optically active isomers of lactic acid to the optically inactive racemic mixture isAnswer: Racemase The sugar concentration of molasses used in fermentation should beAnswer: 10-18% Bacitracin, an antibiotic similar to penicillin, is produced byAnswer: Bacillus licheniformis Which of the following Ascomycetes are used for riboflavin production?Answer: Both (a) and (b) B. flavum strain can be used for the production ofAnswer: All of the above A major organism used in commercial bioleaching for copper recovery isAnswer: Thiobacillus ferrooxidans During fermentation, pyruvic acid is converted into organic products such asAnswer: Ethyl alcohol and lactic acid Which of the following are true for the heterofermentative microorganism producing lactic acid?Answer: Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products The submerged fermentation of vinegar utilizes special fermentor designs known asAnswer: Both (a) and (b) The major organism used in the microbial production of citric acid isAnswer: Aspergillus niger Which of the following organism is utilized for the production of D-L-alanine?Answer: Microbacterium ammoniaphilum The aerated submerged bacterial fermentation to produce vitamin B12 employs strains ofAnswer: Both (a) and (b) Which of the following is a heterofermentative micro-organism?Answer: Lactobacillus delbrueckii Riboflavin is a by-product of __________ fermentation carried out by Clostridium spp.Answer: Acetone butanol Rickes et al. recovered active crystalline vitamin B₁₂ from the culture ofAnswer: Streptomyces griseus The rapid process of microbial oxidation developed to produce acetic acid from ethanol at Schutzenbach, Germany is also known asAnswer: Both (a) and (b) Which of the following micro organism utilizes lactose as a carbon source in production of lactic acid from whey media?Answer: Lactobacillus bulgaricus The organism which utilizes the pentose of sulphite waste liquor for lactic acid production isAnswer: Lactobacillus pentosus Chlorotetracycline a broad spectrum antibiotic is produced byAnswer: Streptomyces aureofaciens