Category: BIO217 0 BIO217 1 / 50 Which one of the following is not an agricultural activity of microorganisms? Biological central agents Digestion of cellulose present in grasses on which ruminant animals feed Production of ethanol Cycling of nutrients needed to maintain ecological balance 2 / 50 ____________are large thick walled spores formed when the tips of two sexually compatible hyphae fuse together. Check 3 / 50 Heat – sensitive liquids and gases are sterilized by the use of ___________ method Check 4 / 50 Spoilage of meat and / or vegetables in cold syorage can be caused by some _________ Check 5 / 50 The vegetative structure of a fungus is called a __________ Check 6 / 50 The microscope used in the examination of unstained organisms suspended in fields is called ________ microscope. Check 7 / 50 A phase in the growth curve during which there is no increase in cell number of a microbial population is called ____________. phase Check 8 / 50 Beijerinck and __________ pioneered the use of enrichment cultures and selective media. Check 9 / 50 Which of the following disinfectants is used in food industries? aldehydes ethylene chlorine alcohol 10 / 50 In food preparation, microbes are reduced to acceptable levels using methods such as addition of vinegar and ___________ Check 11 / 50 Which of the following is not placed in any microorganism’s domain? Viruses Protozoa Fungi Algae 12 / 50 A microscope in which the magnified image formed by the objective lens is further enlarged by one or more additional lenses is known as: ___________ Simple microscope Light microscope Compound microscope Electron microscope 13 / 50 The acid used as a pharmaceutical to supply calcium to the body is: _________ Lactic acid Citric acid Gubberellic acid Gluconic acid 14 / 50 The vaccine for the disease anthrax was developed between the period: 1870 -1880 1860 - 1870 1880 - 1890 1890 - 1900 15 / 50 ___________ are the most plentiful form of plankton in the Arctic. Check 16 / 50 The microscope used to study microbial motility and determining the shape of line cells is: __________ Transmission microscope Phase contrast microscope Scanning microscope Dark field microscope 17 / 50 The Basidiomycota are known a _________ fungi. Check 18 / 50 A system of surgery designed to prevent microorganisms from entering wounds was developed by __________ Check 19 / 50 Based on the source of energy bacteria can be classified as phototrophs and _________ Check 20 / 50 Most microorganisms cannot be seen without ___________ Check 21 / 50 Alcoholic fermentation was found to be catalyzed by: __________ Living yeast cells Oxidase Catalase Hydrogenase 22 / 50 Cell division in Saccharomyces cerevisiae occur by _________ Check 23 / 50 ______________ is used for food preservation. Check 24 / 50 Human insulin and human growth hormone are produced by __________bacteria. Check 25 / 50 The most commonly used differential staining procedure is: __________ Gram staining Acid fast staining Simple staining differential staining 26 / 50 Simple acellular entities that can only reproduce within living cells are called _________ Check 27 / 50 ___________ coined the term cell. Check 28 / 50 Bacteria were first discovered in the year __________ Check 29 / 50 Alcoholic fermentation was found to be catalyzed by __________ Check 30 / 50 The union of a special male structure called a spermatium with a female reproductive structure is called ___________ Check 31 / 50 The formation of diphtheria tetanus antitoxins was induced by: ___________ Edwards Jenner Francesco Redi Joseph Lister Robert Koch 32 / 50 Mutation can involve the ____of nucleotides. I. division , II. addition, III. deletion I only II only I and II III and II 33 / 50 Gram stain was developed in the year _________ Check 34 / 50 ___________ was awarded the 1905 nobel prize for physiology or medicine. Check 35 / 50 A microscope in which the magnified image formed by the objective lens is further enlarged by one or more additional lenses is known as: __________ Electron microscope Light microscope Simple microscope Compound microscope 36 / 50 A form of asexual reproduction process in which a single cell divides into two cells after developing a transverse septum is called ___________ Check 37 / 50 Which of the following is not a characteristic of the mycobacterium? they are either saprophytes or pathogens they are either anaerobes or preferentially anaerobic they are acid fast they are slightly straight or curved rods 38 / 50 A regular polyhedron with twenty equilateral triangle faces and twelve vertices is known as __________ Check 39 / 50 The first person to publish an extensive, accurate observation of microorganisms was ___________ Check 40 / 50 The class of microorganisms that has growth optima around 20 ۫C to 45 ۫C is __________ Check 41 / 50 Which of the following statements best describe transduction? a mechanism of genetic transfer that involves cell to cell contact the formation of a new genotype by reassortment of genes a mechanism of genetic transfer in which a bacterial virus transfer DNA from one cell to another a genetic transfer process by which free DNA is incorporated into the recipient cell 42 / 50 Systematic classification of fungi is based on sequence analtses of _________ RNA. Check 43 / 50 Who supported the theory of spontaneous generation? Louis Pasteur Louis Jablot John Needham Francesco Redi 44 / 50 __________ is used to disinfect effluents from sewage treatment. Check 45 / 50 __________ is the simplest virus. Check 46 / 50 Another name for phenol is _________ Check 47 / 50 Which of the following classes of microorganisms has growth optima around 20 ۫C to 45 ۫C? thermophiles psychophiles hypothermophiles mesophiles 48 / 50 Which of the following groups of bacteria is not with unusual properties? Spirochetes Budding bacteria Archaeobacteria Gliding non – fruiting bacteria 49 / 50 The process by which the internal and external structures of cells and microorganisms are preserved and fixed in a position is known as: _________ Fixation Hanging drop technique staining of specimens Stained smears of microorganism 50 / 50 The most commonly used differential staining procedure is: ____________ Gram staining Simple staining differential staining Acid fast staining Restart quiz Rate this quiz Send feedback
