Which of the following method is useful for isolation and detection of organisms having the ability to produce organic acids? 3. Clarification: Hanging drop technique is used for motility testing of bacteria. (3) It provides information on whether the product formed by microorganisms is new or not. c) an increase in the size of an individual organism Which of the following yeast can be used to produce microbial protein? the virus must not be able to lyse red blood cells. Primary Screening of Microorganisms: Primary screening may be defined as detection and isolation of the desired microorganism based on its qualitative ability to produce the desired product like antibiotic or amino acid or an enzyme etc. (1) It is useful in sorting microorganisms that have real commercial value. Which of the following microorganism is eliminated in canned foods? A) radiation. c) prophage The screening is isolation and detection of microorganisms of interest. b) Gram-positive organisms 6. a) True The section contains questions and answers on sanitary quality of water, wastewater, treatment processes, fresh foods microbial flora, food preservation and microorganisms. 1g of soil is added to that test tube and the soil is allowed to settle down. 30 seconds. False. 4. b) gamma rays D. American Type Classifier and Collection. This book uses the What is the pH range of Bromophenol blue? microscopic with a fried egg shape. It is the organization which has the largest department of Research and Development. b) Viruses View Answer, 6. View Answer, 38. Crowded plate technique a) Spread-plate b) False View Answer, 37. You can practice these MCQs chapter by chapter starting from the 1st chapter or you can jump to any chapter of your choice. View Answer, 40. C. 5 8 37) Which of the following is the selective media used for the cultivation and isolation of. d) hydrophobic barrier and site of generation of protonmotive force View Answer, 48. Microbes are certainly ideal for biotechnology. View Answer. View Answer, 27. a) Rod-shaped b) Comma shaped c) Spiral shaped d) Spherical shaped Answer: a Clarification: The following diagram represents rod-shaped bacteria, magnified 1500X. a) cellulose dehydrogenase 2. The normal brown color of the feces is produced by: A. Cellulose B. Pancreatic enzyme d) Fungi c) The optimum temperature for the growth of an organism must be above 50C. Which of the following method is useful for the isolation and detection of organisms having the ability to produce antibiotics? D) removal of waste, inoculation, fermentation, downstream processing. Which of the following statements about food chain and energy . b) 8.0 10.0 c) nucleotides The cell structure of gram positive and gram negative bacteria appear as the picture given below after the gram staining procedure, Gram positive bacteria Gram negative bacteria. D. Indicator dye technique. Which of the following shows the zone of inhibition when a particular organism is grown on a Petri plate? Answer: B 4. D. 6.4 8.0. 12. c) Pour-plate and spread plate b) Syphilis c) chitin D. Amino acid producers. D. Indicator dye technique. 250+ TOP MCQs on Microbes in Industrial Products-4 and Answers, 300+ TOP MCQs on Microbes in Human Welfare and Answers, 250+ TOP MCQs on Microbes in Household Products-1 and Answers, 250+ TOP MCQs on Microbes in Production of Biogas and Answers, 250+ TOP MCQs on Microbes in Household Products-2 and Answers, 250+ TOP MCQs on Microbes in Industrial Products-3 and Answers, 250+ TOP MCQs on Microbes in Sewage Treatment and Answers, 250+ TOP MCQs on Microbes in Industrial Products-1 and Answers, 250+ TOP MCQs on Microbes in Industrial Products-2 and Answers, 250+ TOP MCQs on Microbes as Biofertilizers and Answers, [12 Class Notes] MICROBES IN HUMAN WELFARE Biology CBSE, 250+ TOP MCQs on Microbes as Biocontrol Agents and Answers, 250+ TOP MCQs on Microbes in Metal Containing Habitat and Answers, 250+ TOP MCQs on Microbes in Bioleaching Process and Answers, 250+ MCQs on Isolation and Screening of Industrially Important Microbes and Answers, 300+ TOP MCQs on Bioremediation and Answers, 250+ TOP MCQs on Heat Transfer Applications Thermal Processing and Answers, 250+ TOP MCQs on Environmental Issues Water Pollution and its Control and Answers, 250+ TOP MCQs on Biotechnology Applications Ethical Issues and Answers, 250+ TOP MCQs on Hydraulic Fracturing Frac Job Design and Answers. 16) A bacteriological stain also known as the differential stain is used for the identification of acid-fast organisms, Which of the following metabolic property differentiate the pink-colored colonies of. A. 14. Types of pathogens include specific bacteria strains, viruses, fungi, or parasites that can cause illness in its host. 7. Clarification: ATCC stands for American Type Culture Collection. Which of the following is not related to microbes?a) Microbes are not ideal for biotechnologyb) Microbes produce chemicals during their metabolismc) Microbes can be grown on artificial mediumd) Microbes can live in highly acidic mediumAnswer: aClarification: Microbes can be grown on artificial cultures media where they form colonies. True ticks and fleas. False. The Microbiology Society has a vision and mission around which we base our strategy. Staphylococcus aureus is a major bacterial human pathogen that causes a wide variety of clinical manifestations. D) prevent mold. What are the methods of isolating the pure culture of microorganisms? 4. Our 1000+ MCQs focus on all topics of the Microbiology subject, covering 100+ topics. Prokaryotes are unicellular microorganisms whose cells have no nucleus. D) A and C . Which of the following plate is used to detect and isolate organic acid producers? a) anaerobic cells Automatic Type Counter & Classifier B) nutrients are continuously fed into the reactor and the product is siphoned off during the run. A. A food chain comprising birds, green plants, fish and man. C. perfringens is a spore-forming bacteria, that produce H 2 S and hemolysis on blood agar. Easy detection of the small percentage of useful microorganism. screening of microorganisms includes mcq. Urinary tract infection was suspected, urine sample and swab specimen were taken and cultured on suitable agar media, a microscopic examination was performed. A 19-year-old male living in a tropical region of India visited the hospital. Bacterial cell grown on hydrocarbon wastes from the petroleum industry are a source of _____________ The section contains MCQs on chemotherapy historical highlights, antibiotics and their actions, microbiological assay of antibiotics, antifungal, antiviral and antitumour antibiotics. Who was the first to observe animalcules under the microscope? Has two nuclei C. Forms cysts D. Has a sucking disc E. Survives well in ordinary water, even when this is hot or contains chlorine or detergents, Flagellate parasite is the cause of vulvovaginitis in women in . C. MacConkeys Agar plate 10. b) cell wall Tyrocidines are more effective against ___________________ d) saprophytic For e.g., cellulose producers grow on nutrient medium supplied with cellulose. c) Peritrichous c) Nitrosomonas europaea Official Website of Dr. Shyama Prasad Mukherjee University, Ranchi . 5. D. Indicator dye technique. You can also prevent infections through: Hand-washing. View Answer, 17. The section contains MCQs on diseases caused by fungi and protozoa, therapeutic drugs for fungal treatment and protozoan diseases. True. View Answer, 7. View Answer, 42. 6. 10. Want to cite, share, or modify this book? Microbiology Question Bank PDF book covers problem solving exam tests from microbiology textbook and practical book's chapters as: Chapter 1: Basic Mycology MCQs. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced . Chapter 3: Classification of Viruses MCQs. a) changes in the total population Q.1. All of the above. False. It gets its name from the Danish bacteriologist Hans Christian Gram who first introduced it in 1882, mainly to identify organisms causing pneumonia. Crowded plate technique Which shape of bacteria has been represented in the following diagram?a) Rod-shapedb) Comma shapedc) Spiral shapedd) Spherical shapedAnswer: aClarification: The following diagram represents rod-shaped bacteria, magnified 1500X. Which of the following gram positive bacteria is a strict anaerobe and can only grow in the absence of oxygen? d) cellulase 5. A 7 year old girl developed a sore throat and fever for 2 days. b) Streptococcus lactis Which of the following method is not used in isolation and screening of desired microorganisms? Clarification: The optimum temperature for the growth of an organism should be above 40C. 8. d) 2-fold b) Clostridium botulinum 11. is affected by the patient's food intake on the day of testing. The section contains multiple choice questions and answers on soil microorganisms interactions, nitrogen, carbon and sulphur cycles, aquatic environment, aquatic microorganisms techniques and productivity. Secondary screening helps in detecting really useful microorganisms in fermentation processes, which includes d) chitin, cellulose, or hemicellulose c) Bacillus thuringiensis It is done by using paper, thin layer or other chromatographic techniques. b) aerobic cells b) Magnifying lens Several types of cells of the immune system perform phagocytosis, such as neutrophils, macrophages, dendritic cells, and B lymphocytes. 1. 7. 43) Which of the following methods are the most common and routine culture methods performed in the microbiology lab for the proper isolation and identification of bacteria and fungi? a) electron beams and magnetic fields It is 50,000X magnified image of a bacterium. 10. Cellulose is degraded to cellobiose by the enzyme __________________ View Answer, 19. Place 6 test tubes into a rack and fill each with 9ml of 0.9% NaCl solution. Multiple Choice. a) Mesophile It works best in this range and is also used as a tracking dye in Agarose-Gel Electrophoresis. a) Alcoholic beverages 4. d. using damaged equipment and glassware. A. Biology Multiple Choice Questions on Microbes. Primary screening of organic acids or amines producing organisms is done by__________, (2) Dye such as neutral red or bromothymol blue is used. It belongs to the phthalein family that is employed as an acid-base indicator. 10. b) Longest wavelength of visible light used Sugar fermentation test: Bacteria is grown in a sugar media. We recommend using a Which among the following are microaerophilic bacteria? B) False, Pasteurization is used to sterilize milk. Answer: A A. Defined media and complex media are two broad classes of culture media used in microbiology. b) 10-fold Answer: B Who is considered the father of Western medicine? 30 seconds. There are various microorganisms types like bacteria, fungi, archaea, or protists. Which of the following are true for cytoplasmic membrane? Which shape of bacteria has been shown in the following diagram?a) Rod-shapedb) Comma shapedc) Spiral shapedd) Spherical shapedAnswer: dClarification: The following diagram represents spherical shaped bacteria, magnified 1500X. The screening is isolation and detection of microorganisms of interest. b) Auxanographic technique View Answer, 11. Eubacteria are prokaryotic microorganisms consisting of a single cell lacking a nucleus and containing DNA is a single circular chromosome. determined to obtain accurate susceptibility results. Answer: A The principal microorganism for yogurt is ______________________ 9. a. Streptococcus pyogens b. a) The organism must be genetically stable. 38) All of the following statements are correct about the most common bacteriological media called sheep blood agar that is used in the microbiology laboratory, b) Used for the culture of common fastidious bacteria, c) It is used for the culture of hemolytic bacteria. C. American Type Counter Collection screening of microorganisms includes mcqshortest water tower in the world. d) 2 micrometer in diameter Some bacteria are capable of spore formation so they are highly heat resistant and some are capable of producing heat-resistant toxins. Rhizobium bacteria. c) rod shaped B) False, Microbiology 17 immunization and immune Testi. Chapter 2: Classification of Medically important Bacteria MCQs. Which of the following is used in electron microscope? Often overlooked, hand-washing is one of the easiest and most effective ways to protect yourself from germs and most infections. 8. C. Enrichment Culture technique (3) Attempt to synthesized secondary metabolites outside of their natural environment. C. Enrichment Culture technique Clarification: The pH range of Bromophenol blue is 3.0 4.6. Creative Commons Attribution License b) RNA polymerase A. A routine GTT: is three hours long. Set up a series of 1/10 dilutions: a. The section contains questions and answers on light microscope, microbial Stains, transmission and scanning electron microscope. The Society's role is to help unlock and harness . As primary screening allows the detection and isolation of microorganisms which posses, potentially interesting industrial applications. d) All of the mentioned View Answer, 5. 5. c) hydrophobic barrier Self-Assessment Quiz. It is colourless at pH 8.0 and becomes red at pH above 10.0. Aims and objectives. (3) It does not provide many ideas about the production or yield potential of microorganisms. d) Shortest wavelength of visible light used and an objective with the maximum numerical aperture The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo View Answer, 20. a) Small pox Microscopic examination and culture of the sputum sample revealed gram-positive cocci that appear in chains. C) new batches of microorganisms are screened for increased yield. magic island poem tone Consult Now B) are by-products of metabolism that are not important to microbe function. Microbes like bacteria and many fungi can be grown on nutritive media to form colonies, that can be seen with naked eyes. Which of the following method is useful for the detection and isolation of those microorganisms which are capable of growing on a particular nutrient medium? b) Fermented dairy products c) Spirochaeta a) Leuconostoc mesenteroides Sanfoundry Global Education & Learning Series Fermentation Technology. B) mass, controlled culture of microbes to synthesize products. Besides macroscopic plants and animals, microbes are the major components of biological systems on this earth. Our mission is to improve educational access and learning for everyone. The section contains multiple choice questions and answers on nutritional requirements, bacteriological media and physical conditions growth. this would be absolutely amazing. b) Study of animals and their family APT test C. Elastase I D. Quantitative fecal fat testing: 6. b) Treponema pallidum Growth Factor producers Note when energy and additional compounds are necessary for any of these mechanisms to operate. Q. Vegetative bacteria are able to withstand adverse conditions better than protozoan cysts. d) Pasteur c) neither aerobic and anaerobic cells Diagram and name four mechanisms bacteria use to transport materials across the cytoplasmic membrane. View Answer, 30. d) Pedoviridae b) The organism must be able to produce a high yield of product. You can also download the PDF of Microbiology MCQs by applying below. B. a) Leuconostoc citrovorum b) Mesophile and psychrophile Which of the following statement is correct regarding primary screening________. B. A 24 year old sexually active woman had an infection in the vaginal area with genital discharge while urinating. Answer: D a) Cyanobacteria, Fungi and Viruses d) Indicator dye technique The respiratory chain of bacteria is associated with the _____________ View Answer, 9. a) S mallpox The section contains MCQs on microorganisms, industry, industrial uses of bacteria, molds and yeasts, genotypic changes, bacterial recombination and conjugation, bacterial transduction and transformation. Contact Us. View Answer, 45. 1215, 1216 137, 1217 Particles in a biological aerosol usually vary in size from <1 m to 50 m. c) base analog a) Crowded plate technique Blood C. Electrolytes D. Water: 5. c) Enrichment Culture technique c) American Type Counter Collection The section contains questions and answers on cell division modes, bacteria growth cycle and quantitative measurement. 11. (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. D) all of the above. Respiratory pathogens: Includes common viruses and atypical bacteria 2: NP swab: Pathogens may have prolonged shedding time; positive results may not rule out infection from other pathogens. d) 6.4 8.0 B. Auxanographic technique B) plasmolyzes bacteria and fungi. d) Indicator dye technique Biotechnology, the practical application of microorganisms in making products for human use, is a relatively new science, begun since Pasteur's time. Microbiology is the study of living organisms that are not visible to the naked eyes. (2) It determines which microorganisms can produce a compound. b) Microbacteria Clarification: Auxanographic technique proceeds with 2-plate preparation. c) 2mm in diameter Which of the following method is useful for the isolation and detection of organisms having the ability to produce antibiotics? How do you isolate microorganisms in the air? A) production of alcoholic beverages by microorganisms. Children are more susceptible to this disease. a) Nitrospina gracilis OpenStax is part of Rice University, which is a 501(c)(3) nonprofit. b) irregular Air Sampling. a) cytoplasmic membrane b) Potato Dextrose Agar plate 5. 4. 4. Answer: C These particles may consist of a single, unattached organism or may occur in the form of clumps composed of a number of . For this dilution, it may be said that the solution was diluted _______ a) Regeneration (1) Its a process for the detection and isolation of microorganisms of our interest. Microbial enzyme production concentrates on simple hydrolytic enzymes (proteases, amylases, pectinases) that degrade natural polymers such as proteins, starches, or pectin. The section contains MCQs on spirochetes, negative rods, cocci, facultatively anaerobic gram, rickettsias and chlamydias, mycoplasmas, positive cocci and positive bacteria. Glycosylated hemoglobin: causes sickle cell anemia. a. How do you isolate microorganisms from the soil? b) coliforms It is done by using paper, thin layer or other chromatographic techniques. Which among the following group of microorganisms are found in the ducts of cows mammary glands? In batch fermentation, d) Corynebacterium diphtheriae b) Nitrosococcus oceanus E. coli is a sub-group of the fecal coliform group. Viral hemagglutination assays only work with certain types of viruses because. b) Candida utilis View Answer, 3. the virus must be able to cross-link red blood cells directly. Yeast cells are good source of. b) Corticoviridae D. Hanging Drop technique. Phagocytosis is a critical part of the immune system. It changes from yellow at pH 3.0 to blue-violet at pH 4.6. The growth factor-like amino acids, vitamins promotes the growth of auxotrophic mutants. Answer: 1. In regions of the estuary that are nutritionally poor, it is more likely to find which of the following organisms? Which of the following is not microbe?a) Bacteriab) Protozoac) Viroidsd) WormsAnswer: dClarification: Microbes are diverse in nature and include- protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and also prions that are proteinaceous infectious agents. A) heat below 100 oC. Which of the following is the example of encapsulated gram-positive bacteria? Microbiology MCQ. YB STUDY is an Indias largest Online learning website offers learning for classes 1 to 12 and competitive exams like NEET, JEE, Olympiads, NTSE, KVPY, State boards etc. The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. View Answer, 31. membranes of microorganisms. 40) Biochemical tests are a common and conventional laboratory procedure in the differentiation and identification of enteric bacteria. When examined he said the cough first started about a month ago, he said no other symptoms appeared in the first week, he complained about the loss of appetite due to which he lost some of his body weight. 13. A. b) Auxanographic technique Now that you have read Lesson 5 and have completed the exercises, you should be ready to take the self-assessment quiz. Which of the following dye is colourless at acidic pH and becomes red at basic pH? Answer: B a) Thiobacillus thiooxidans C) alcohol. Answer: A. Clarification: Screening is the use of highly selective procedures to allow the detection and isolation of only those microorganisms of interest from a large microbial population. He came with a lesion on the lower part of the left leg that according to him first appeared about a week before visiting the hospital. B) 62.3oC for 30 minutes. A sputum sample was taken for the lab diagnosis for the isolation and identification of the microorganism. Which of the following method proceeds with 2-plate preparation? b. Litmus milk test: When bacteria is grown in this medium, there may be the production of acids or alkali or even no change in pH. 4. (4) Attempt to Stain microorganisms. b) Biological assay c) Chlorophycophyta All Rights Reserved. View Answer, 2. View Answer, 13. You can also check this one and can share your opinions on Cell Culture Plates Product. In screening studies, it is recommended to use non-sterile soil, test different inoculation methods and different abiotic stresses, and even select microorganisms from plants under abiotic stress. Which of the following shows the zone of inhibition when a particular organism is grown on a Petri plate? 10. In which of the following treatment involve oxidation of organic constituents of the wastewater? View Answer, 33. a) Study of molecules that are visible to human eyes 2. B) False, When in doubt, throw it out. a) Condenser lens Secondary screening should yield the types of information which are needed in order to evaluate the true potential of a microorganisms industrially usage. Through primary screening only few or many microorganism that produce a industrially . Clarification: The transfer of a 1ml solution to 9ml d/w is called as serial 10-fold dilution. A. 3. d) appendaged bacteria A microorganism is a living thing that is too small to be seen with the naked eye. d) Amino acid producers 7. A. Fecal occult blood B. c) Streptococcus thermophilus c) UV light Which of the following method is useful for isolation and detection of organisms having the ability to produce organic acids? c) fecal streptococci All microbes are harmful to humankind.a) Trueb) FalseAnswer: bClarification: Although microbes cause a large number of diseases in human beings, various animals and plants, but not all microbes are harmful. C) maintain a high osmotic pressure to kill microorganisms. Fermentation Technology Questions on Isolation and Screening of Industrially Important Microbes. Which of the following are present in teichoic acids? Clarification: The question mark in the following figure represents flagella of a rod-shaped bacterium. c. confining long hair and loose clothing . b) Streak-plate 1. A. B. 100-fold Phosphorus is essential component of __________ 5.6 - 8.2 form of c. 3.0 - 6.0 d. 8.0 - 14.0 a. Organic compounds b. Inorganic compounds 14. Methyl red Now, 1ml of that stock solution is taken and transferred to the 2nd test tube containing 9ml of distilled water. The act of phagocytizing pathogenic or foreign particles allows cells of the immune system to know what they are fighting against. Which of the following foods is NOT made by fermentation? Which among the following is a pathogenic algae for humans? The bacterium Staphylococcus aureus is which type of bacteria? c) Objective lens Full-form of ATCC is _________. 12. coliform bacteria in drinking water, the source is probably environmental and fecal contamination is unlikely. a) Treponema 2. Which of the following was NOT a kingdom in Linnaeuss taxonomy? This will help you to prepare for exams, contests, online tests, quizzes, viva-voce, interviews, and certifications. b) Auxanographic technique It should have a fast rate of kill of micro-organisms. a) Neisseria gonorrhoeae. B) heat. Which was the first disease for which a chemotherapeutic agent was used? Answer: C Which of the following method is useful for the isolation and detection of organisms having the ability to produce antibiotics? The methods for isolation and screening are a crowded plate, auxanography, enrichment culture and use of indicator dyes. What is the average size of a microbe?a) Less than 1 mmb) More than 1 cmc) Less than 0.1 mmd) More than 0.1 mmAnswer: cClarification: Microbes are microorganisms which have a size less than 0.1 mm. 3.0 4.6 They are present even at sites where no other life-form could possibly exist- sites such as deep inside geysers, deep in the soil, etc. All the microorganisms such as amoeba, protozoa, viruses, bacteria are studied under microbiology. A. Performance and sterility testing of media lots should also be determined and b) True Clarification: Adenoviruses cause respiratory infections. A) fermentation, downstream processing, removal of waste, inoculation. a) Streptomyces sp. 1. a) Amphitrichous Which organisms show the zone of inhibition grown on a Petri plate? The microorganisms from lakes and rivers can grow at a salt concentration of _________ a) The organism must be genetically stable The prototrophs are the organisms which are not capable of synthesizing all growth requirements for themselves. View Answer, 3. D) 134 oC for 1 second. Crowded plate technique b) Automatic Type Counter & Classifier C. Phenolphthalein Here are 1000 MCQs on Microbiology (Chapterwise). A BV test is done in a similar way as a pelvic exam or Pap smear. c) An objective with minimum numerical aperture 8. A) True requires five blood samples . c) Mycobacterium tuberculosis D. Indicator dye technique. Definition: true bacteria; bacteria excluding the archaea. b) transposons View Answer, 21. Measles is a disease caused by a virus, it is spread via respiratory droplets. Engineering 2023 , FAQs Interview Questions. (4) It separates out only a few microorganisms, only a few have commercial value while discards the valueless microorganisms, 14. lack of cell wall. a) plasmid Clarification: Screening is the use of highly selective procedures to allow the detection and isolation of only those microorganisms of interest from a large microbial population. _______ are the agents that act as carriers of a pathogen and spread diseases. Best method of sterilization at commercial level is a) Hot air oven b) Autoclaving c) Radiation d) Sun light answer-C 5. screening of microorganisms includes mcq; screening of microorganisms includes mcq. Chapter 4: Clinical Virology MCQs. a) above 1 percent Which of the following is the most accurate method for microbial assay of antibiotics? a) Watson Secondary metabolites Clarification: The use of Indicator Dye Technique is used for detection and isolation of the organisms which are organic acid producers. Includes common viruses, bacteria, and parasites 1,2: Stool sample: Sensitive, certain positive results may be unrelated to active infection. Lung infection was suspected, and a chest X-ray was performed which showed infection in both lungs. Clarification: Phenol Red plate is used to detect and isolate organic acid producers. 5. Primary treatment removes material that will either float or readily settle out by gravity. Clean and disinfect surfaces that are touched often. a) Bacillariophycophyta Answer: C 9. Defined media are prepared by adding precise amounts of highly purified inorganic or organic chemicals to distilled water. They are mainly of two types: Primary and Secondary Screening Primary Screening : The effective screening must in one or few steps which allow the discarding of many valueless microorganisms, while at the . The section contains MCQs on phages structure and morphology, bacterial viruses replication, lysogeny and lytic. A test tube contains 9ml distilled water. 2. d) bacterial infection d) Hanging Drop technique C. Organic acid producers A skin biopsy test was performed and the infection was diagnosed to be a parasitic infection. The section contains multiple choice questions and answers on microorganisms characteristics and microbial classification. 10-fold The lesson covers the complete explanation of class 8 Chapter 2 Microorganisms.Topics covered are Introduction to Micro-organisms and microbiology, different types of Micro-organisms, Useful and Harmful Micro-organisms. View Answer, 43. Actinomycetes are Gram-positive, facultative anaerobic fungus-like filamentous bacteria which remain on the top of the natural antibiotic producers.