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- A disinfectant is used on your work surfacea. before the beginning of laboratory procedures.b. after all work is complete.c. after any spill of live microorganisms.d. Both (b) and (c) are correct.e. All of the above are correct.What is the best method to filter the precipitate from it's reaction mixture? a Gravity filtering is accomplished by folding the filter paper into a cone and placing it in a long stem funnel. b Vacuum filtering using a Buchner funnel with filter paper. c Using a filtering crucible that can be dried and ignited at red heat. d All of the above, just depends on the precipitate.3. Which percentage of medical waste is infectious or hazardous? A) 25% B)50% C)75% D) 85%
- The order of additives on a product label is by: a. caloric index b. production expense c. prevalence in the product d. toxicity levelWhich of the following is an important consideration when selecting a disinfectant for use in the facility? Please select all that apply. [mark all correct answers] a. Pathogens affected by product b. Contact/Kill time c. Safety profile of the product d. Ease of useThe primary hazards to people working in a BSL 1 or 2 laboratory relate to a. accidental skin punctures caused by mishandling of sharp lab tools. b. mucous membrane exposure due to accidental splashing of cultures. c. accidental ingestion of infectious material. d. All of the above are primary hazards in a BSL 1 or 2 lab. Which of the following is required when working with BSL 2 agents? a.Biohazard warning signage on doors and lab areas where agents are kept or used. b.Self-closing, double door access to the lab facility. c. Clothing change when entering or leaving the lab. d. There are no special precautions needed for a BSL 2 lab.
- Which of the following is NOT a chemically definable component in culture media? a.Sheep's blood b.Brain infusion c.Milk d.All of the above e.None of the aboveWhich of the following factors affect the effectiveness of hand washing: Select one: a. Frequency and duration of hand washing b. Following the antiseptic manufacture instruction precisely c. All hand surfaces should be included d. AllWhich of the following is NOT a recommended method for preventing cross-contamination? A. Washing dishtowels and aprons often B. Separating raw and cooked foods C. Store food in covered container D. Uising utensils and a cutting board for all food preparation
- 3) Which of the following corresponds to a standard drink of alcohol? A) 12 ounces of beer B) 12 ounces of wine C) 5 ounces of vodka D) 5 ounces of beer(CASE 2) A chemist attached a NFPA symbol (illustrated below) on the bottle of a newly manufactured chemical. If the chemical is extremely dangerous, what must be the grade of the hazard in the posted area?8. A retort pouch is: a) Filled first with food product and then retorted (heat-sterilization) to extend product shelf life. b) Food is heat-sterilized first, and then added to a pouch under nitrogen c) Retort pouches requires thermally stable seals d) Both a and c
