Microorganisms are involved in each of the following processes EXCEPT infection fog production decomposition of organic materials O food production oxygen production
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- A chemical, produced by a microbe to inhibit the growth of other microbes, is isolated and then modified in a chemical reaction in the laboratory. Which of the following terms would most accurately apply? O Synthetic O Antibiotic O Phenolic O Microbistatic O OpportunisticWhich of the following the equipment is used to sterilize the nutrient broth and agar? O Bunsen burner O refrigerator O incubator autoclave Ở microwaveWhat is the word used to describe microbes which have simple enzyme systems and which require growth factors (e.g. vitamins, amino acids) to grow? Fastidious Buffer O Trouble Easy prt sc home F8
- What is the word used to describe microbes which have simple enzyme systems and which require growth factors (e.g. vitamins, amino acids) to grow? Trouble Buffer Fastidious EasyMicroorganisms are often grouped according to their optimum growth temperatures. Which groups are most likely to spoil refrigerated foods?Sterility: is achieved by most disinfectants and antiseptics (i.e., chemical agents) O is achieved by soap and water is the absence of PATHOGENS or spoilage-causing microbes ONLY Cannot be achieved by ethylene oxide O CANNOT be achieved by autoclaving O is the absence of ALL living cells and endospores
- Describe several ways in which microorganisms are important inthe food and agricultural industries.The inhibition of bacterial growth and reproduction without necessarily destroying the organisms is the result of a disinfectant a sterilant a bactericide an antisepticSewage works use microbes in many ways to break down organic matter. Which of the following processes is NOT carried out? Pathogenic bacteria and viruses are added to the input sewage as a tracer and to ensure the processes have all worked well Bacteria and archaea are used in sludge digesters to breakdown organic matter anaerobically Bacterial trickle filter beds have a wide variety of microbes to break down organic matter Activated sludge selects for Gram negative bacteria that break down waste
- 3) CULTIVATING MICROBES: Definitions Ingredients Beef What does not grow What grows Chemoheterotrophs Fastidious Media Complex Agar Broth Yeast Soy Thioglycolate MSA McConkey EMB BloodDay Care Center outbreak: Salmonellosis You just finished identifying the fecal contaminated food at the first restaurant when you learn there is an outbreak of Salmonella-food poisoning at a day care center, You sample food from the Center's refrigerator and are worried that the egg salad or chicken salad or peanut butter used to make sandwiches may be contaminated with Salmonella. You know Salmonella cannot ferment lactose and it can make hydrgoen sulfide. The strain associated with the outbreak cannot ferment sucrose but can ferment glucose. You isolate in pure culture bacteria from each of the suspect foods and inoculate each into TSI slants. (see results below) egg salad microbe chicken salad microbe peanut butter microbe TSI TSI TSI W FWSAll of the following are ways microorganisms adapt to limited nutrients except: synthesize increased amount of enzymes for uptake and metabolism of limited nutrients form metabolically active highly resistant endospores synthesize enzymes needed to use a different nutrient acetic acid adjust the rate at which they metabolize nutrients