Nester's Microbiology: A Human Perspective
9th Edition
ISBN: 9781259709999
Author: Denise G. Anderson Lecturer, Sarah Salm, Deborah Allen
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5, Problem 5MC
Which concentration of alcohol is the most effective germicide?
a) 100%
b) 75%
c) 50%
d) 25%
e) 5%
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Which concentration of alcohol is the most effective germicide?a) 100% b) 75% c) 50%d) 25% e) 5%
Which of the following is used in the sterilization of the medium?a) benmargeb) swabc) autoclaved) centrifugee) cooling
1. The Petri Dish method is used in microbiology to raise bacteria in: a) rapid growth b) pure culture c) septic
environment d) all of the above
2. What is the difference between antiseptic and sanitization?
3. In order to prevent any kind of contamination the medium must be _________ before placing it in the Petri dish.
a) lyophilized b) pasteurized c) autoclaved d) distilled
Chapter 5 Solutions
Nester's Microbiology: A Human Perspective
Ch. 5 - How is preservation different from pasteurization?Ch. 5 -
2. What is the most chemically resistant...Ch. 5 - Explain why it takes longer to kill a population...Ch. 5 - What is the primary reason that wine is...Ch. 5 -
5. What is the primary reason that milk is...Ch. 5 - When canning, why are low-acid foods processed at...Ch. 5 - How are heat-sensitive liquids sterilized?Ch. 5 -
8. How does microwaving a food product kill...Ch. 5 -
9. How is an iodophore different from a tincture...Ch. 5 - Name two products commonly sterilized using...
Ch. 5 - Unlike a disinfectant, an antiseptic a) sanitizes...Ch. 5 - The D value is defined as the time it takes to...Ch. 5 - Prob. 3MCCh. 5 - Prob. 4MCCh. 5 - Which concentration of alcohol is the most...Ch. 5 - All of the following could be used to sterilize an...Ch. 5 - All of the following are routinely used to...Ch. 5 - Aseptically boxed juices and cream containers are...Ch. 5 - Commercial canning processes are designed to...Ch. 5 -
10. Which of the following is false?
a) A...Ch. 5 - An agriculture extension agent is preparing...Ch. 5 - As a microbiologist representing a food...Ch. 5 - This graph shows the time it takes to kill...Ch. 5 -
2. This diagram shows the filter paper method...
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- The difference in the colony appearance of bacteria cells growing on mannitol salt agar is detected by a) methyl blue b)methyl red c) phenol d) eosin e) salt .arrow_forwardBenzoic acid is an antimicrobial chemical naturally found inwhich of the following foods?a) Apples b) Cranberries c) Eggsd) Milk e) Yogurtarrow_forwardListen Which of the following methods of microbial control is used most often with surgical equipment? a) autoclave b) sugar and salting c) dessication d) lyophilizationarrow_forward
- Transparent double-sided dishes used for growing microbes are most commonly called A) Petri dishes. B) baker dishes. C) sterilization plates. D) culture medium plates.arrow_forward-For each item listed below, select a sterilant that you feel is the most suitable and effective for that item. Discuss why you selected each sterilant.? A) plastic Petri dishes to be used for nutrient media B) glass tubes of bacterial cultures to be discarded C) sterile milk D) dozens of reusable glass pipets E) bone tissue for grafting F) room air G) hospital mattresses H) biopsy tissue for histology analysis I) plastic respiratory therapy equipment and arthroscopes J) vaccinesarrow_forwardAseptic technique refers to A) the microbial inoculum placed into a test tube or onto a Petri plate. B) a series of practices to avoid contamination. C) the autoclave and other sterilizing procedures. D) cleanliness in the laboratory.arrow_forward
- 44. The use of chemical agents to kill or inhibit the growth of microorganisms within their host’s tissue is called: a) antiseptic b) sanitization c) disinfection d) chemotherapeutic e) sterilizationarrow_forward1) The slowest method in reducing the number of bacteria in a culture or the environment is: a) Sterilization b) Disinfection c) Antisepsis d) Sanitization e) Autolysis2) The molecule that helps insert the peptidoglycan monomers into the cell wall of the bacteria is: a) Ferredoxin b) Spherion c) Penicillin Binding Protein (PBP) d) Bactoprenol e) -Lactam Ring 3) A division in Eukaryotes that involves nuclear division without a cytokinesis will lead to the formation of: a) Baeocyte b) Mycellia c) Syncitium d) Myofibril e) all the above4) All the following are critical factors in determining the effectiveness of an antimicrobial agent except: a) Population size b) Species c) Location d) pH e) Temperature 5) The autoclave temperature must be raised up to _____ in order to effectively kill the bacterial spores: a) 121.1 oF b) 121.1 oC c) 121.1 oK d) 211 oF e) 112 oFarrow_forward11. Foods can be preserved in all the followings except: a) lyophilizing b) Drying c) Salting d) Fermentation 12. The temperature of the autoclave should be held for _____ minutes at least: a) 10 b) 15 c) 20 d) 30 13. The organism used to produce soft cheese is: a) Penicillium b) lactic acid producing bacteria c) ethanol producing bacteria d) a and carrow_forward
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