Category Archives: Microbiology MCQ

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Distribution and Techniques for the Study of Aquatic Microorganisms”. 1. Protozoa and other minute animal life are known as ____________________ a) plankton b) phytoplankton c) zooplankton d) mycoplankton 2. Microbial inhabitants of the bottom region of a body of water are referred to … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Aquatic Environment”. 1. The moisture contained in clouds and precipitated as snow,hail,rain etc constitutes _________________ a) Atmospheric water b) Surface water c) Groundwater d) Subterranean water 2. The surface waters are susceptible to contamination with microorganisms from _______________ a) the air b) the … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Soil Microbiology – Carbon Cycle & Sulphur Cycle”. 1. Which among the following are the most important agents for carbon dioxide fixation? a) bacteria b) fungi c) algae d) protozoa 2. Fresh air contains approximately ______ percent carbon dioxide by volume. a) 0.01 … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Soil Microbiology – Nitrogen Cycle”. 1. Ammonia oxidizers and nitrite oxidizers are ______________ a) Gram-negative chemolithotrophs b) Gram-positive chemolithotrophs c) Gram-negative photolithotrophs d) Gram-positive photolithotrophs 2. Alanine gives pyruvic acid on deamination. a) True b) False 3. How much time does nitrifying bacteria … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Interactions among Soil Microorganisms”. 1. The association which involves the exchange of nutrients between two species is referred to as ______________ a) mutualism b) syntrophism c) commensalism d) antagonism 2. The degradation of complex molecules in soil by fungi for utilization by bacteria … Read more

This set of Microbiology Multiple Choice Questions & Answers focuses on “Microbiological Assay of Antibiotics, Antifungal, Antiviral and Antitumour Antibiotics”. 1. Which of the following is the most accurate method for microbial assay of antibiotics? a) Physical assay b) Chemical assay c) Biological assay d) Chemical and biological assay 2. The international unit of penicillin … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Antibiotics and their Mode of Action”. 1. Bacterial cells grown in a medium exposed to high osmotic pressure, changes shape from rod-shaped to __________ shaped. a) spherical b) rod shaped c) irregular d) elongated 2. Cell-wall biosynthesis is inhibited by antibiotics by inhibiting … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Historical Highlights of Chemotherapy”. 1. Which of the following is not a characteristic of a chemotherapeutic agent? a) low toxicity for host cells b) high toxicity for the parasites c) less penetrating power d) does not affect the host’s natural defense mechanism 2. … Read more

This set of Basic Microbiology Questions and Answers focuses on “Evaluation of Antimicrobial Chemical Agents”. 1. Which of the following methods is used for determining the decrease in the amount of growth? a) test done on agar medium plate b) test done into an agar medium or broth c) test done by transfering water-soluble substances … Read more

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Chemical Agents – Major Groups of Antimicrobial Agents”. 1. How much percentage of the aqueous solution of phenol rapidly kills the vegetative cells of microorganisms? a) 1% b) 2% c) 5% d) 10% 2. The antimicrobial activity of phenolics is not reduced at … Read more