test 3 study guide

test 3 study guide - Part I 1. Assume you have a bacterial...

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Part I 1. Assume you have a bacterial cell in which the DNA is radioactively labeled (i.e. both strands are radioactive). The cell is placed in a non-radioactive medium and goes through three rounds of binary fission, producing eight cells. These cell generations are shown below. Darken heavily all progeny cells in each generation that will be radioactive. What is the name used to describe the form of DNA replication which produces this outcome? A. conservative B. semi conservative C. non conservative D. meiosis E. mitosis Part II 1. [X Type] Which of the following treatments could be relied upon to sterilize stainless steel utensils? A. boiling water B. steam under pressure C. liquid nitrogen (-196C) D. dry heat @ 120 for 25 min E. Pasteurization F. Lyophilization G. Freezing at –20C H. Exposure to gamma-ray 2. Maintaining a low water activity is important in the preservation of which of the following? A. Leather goods B. Powdered milk C. Crackers D. Cereal E. Books 3. which of the following classes of composed are correctly matched with the application? A. Phenolics- topical antiseptic, local anesthetic effect, disinfectant, gargles and mouthwash
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B. Halogens- skin sepsis, topical application to eyes of newborns to protect against Neisseria gonorrhoeae infection C. Heavy metals- drinking water purification D. Alcohols- skin antiseptic in 50%-70% concentration E. Surface-active agents- asepsis of skin; disinfection of operating room equip, dairy and restaurant sanitation F. Ethylene oxide- gaseous sterilization of heat-labile material 4. Enzymes such as catalase, peroxidase, and superoxide diamotase are important because: A. They permit a microbe to live in anaerobic environments B. They make important nutrients available to the cell
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This note was uploaded on 04/23/2008 for the course BIO 310 taught by Professor Morrison during the Spring '08 term at CofC.

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test 3 study guide - Part I 1. Assume you have a bacterial...

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