Leaves that live for only a single year or growing season are classified as ________
Fill in the blank(s) with correct word
deciduous
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In experiments designed as those of Hershey and Chase (1952), 35S was added to a virus replicating within its bacterial host. The new virions were carefully isolated and used to infect fresh bacterial cells in the absence of any radioisotopes. Where would you expect to find the 35S radioisotope?
A) in the phage ghosts B) in the bacterial matrix proteins C) in the bacterial DNA D) in the nucleic acid of the new virions E) in the protein coat of the new virions
Most of the bacteria involved in periodontal disease are obligate (strict) anaerobes. Explain why this is the case.
A. Mouthwashes and toothpaste destroy most of the strict aerobes that are found on teeth. B. Sugar and other carbohydrates used by the oral bacteria can be more easily consumed anaerobically. C. The oral cavity is a low oxygen environment. D. The crevice between the gingiva and the tooth is low in oxygen.
A one-way relationship in which one species
benefits at the expense of another is a. commensalism. b. competitive exclusion. c. parasitism. d. obligate mutualism. e. a neutral relationship
Which of the following is true about pasteurization?
a. the technique was invented by Alexander Flemming b. it dramatically affects the color, texture, and taste of foods c. moderately high temp is applied, long enough to kill coxiella burnetii d. food is heated for a very long time to kill microbes