You have been given a liquid culture of bacteria and you are asked to separate the bacterial cells from the liquid. What is the equipment that can be used to this? Choose one answer. Electrophoresis Vacuum Filtration Spectrophotometer None of the others

You have been given a liquid culture of bacteria and you are asked to separate the bacterial cells from the liquid. What is the equipment that can be used to this? Choose one answer. Vacuum Filtration None of the others Spectrophotometer Electrophoresis

Which bacterial cells can be transformed in a laboratory? / Watter selle kan in 'n laboratorium getransformeer word? A. Competent cells / Kompetente selle B. Endospores / Endosporee C. E. coli D. Any bacterial cells / Enige bakteriese selle

Assume you stain Bacillus by applying malachite green with heatand then counterstain with safranin. Through the microscope, thegreen structures area. cell walls.b. capsules.c. endospores.d. flagella.e. impossible to identify.2. Live cells at a depth of 1 mm and with reduced phototoxicity canbe viewed through aa. darkfield microscope.b. fluorescence microscope.c. two-photon microscope.d. confocal microscope.e. phase-contrast microscope.3. Capsule staining is a difficult technique to accomplish becausea. capsules are antigenic.b. capsules repel most biological dyes.c. capsular materials are water soluble.d. the specimen has to be mixed with fine colloidal suspension ofIndia ink or nigrosin.4. You observe that the cells of a Gram-stained urine sample appearpurple in brightfield microscopy, with cocci-shaped bacteriaarranged in chains. You conclude:a. the urine sample is too old.b. the smear is too thick.c. gram staining is unsuitable for this sample.d. the cells are gram-positive.e. none of the above.5. Which of the following is not a functionally analogous pair of stains?a. nigrosin and malachite greenb. crystal violet and carbolfuchsinc. safranin and methylene blued. ethanol-acetone and acid-alcohole. All of the above pairs are functionally analogous.6. Which of the following pairs is mismatched?a. capsule—negative stainb. cell arrangement—simple stainc. cell size—negative staind. Gram stain—bacterial identificatione. none of the above7. Assume you stain Clostridium by applying a basic stain,carbolfuchsin, with heat, decolorizing with acid-alcohol, andcounterstaining with an acidic stain, nigrosin. Through themicroscope, the endospores are 1 , and the cells are stained2 .a. 1—red; 2—blackb. 1—black; 2—colorlessc. 1—colorless; 2—blackd. 1—red; 2—colorlesse. 1—black; 2—red8. Assume that you are viewing a Gram-stained field of red cocci andblue rods through the microscope. You can safely conclude thatyou havea. made a mistake in staining.b. two different species.c. old bacterial cells.d. young bacterial cells.e. none of the above9. In 1996, scientists described a new tapeworm parasite that hadkilled at least one person. The initial examination of the patient’sabdominal mass was most likely made usinga. brightfield microscopy.b. darkfield microscopy.c. electron microscopy.d. phase-contrast microscopy.e. fluorescence microscopy

How are you going to determine if the bacterial cells were transformed? / Hoe gaan u bepaal of die bakteriese selle getransformeer het? A. Treat cells with plasmid / Behandel selle met plasmied B. Treat cells with calsiumchloride / Behandel selle met kalsiumchloried C. Culture on selective plates with ampicillin / Kweek op selektiewe plate met ampisilien D. Culture on Nutrient agar / Kweek op voedings agar

Sample QuestionPlease choose all methods used to identify bacteria.Microscopic appearance