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Unformatted text preview: Mic102/Fa07/Appleman Quiz 1, 17 October 2007 This quiz is to represent only your own work . As a UC Davis student, you are bound by an honor code; if you cant be trusted with that, can you be trusted in a career in, say, the health professions? This quiz is closed book, closed note. Please hand in a blue scantron with the answers to the multiple choice section of the quiz. Make sure that it has your name, student I.D.#, and Test form A filled in. You will also need to hand in the last two pages of this quiz, with your name on each. Your mouth is a rich environment, home to somewhere between 700 and 1000 different species of microorganisms; its difficult to estimate the number of cells, but it is probably in the hundreds of thousands. 1. Most of the microbes in your mouth are Bacteria, although there are some Archaea. How are these best distinguished from one another? a) Gram stain b) rRNA sequence c) phase-contrase microscopy d) comparison of growth rates in minimal medium 2. The Archaea in your mouth differ from your Bacteria in a) cell membrane chemistry b) flagellar structure c) cell wall chemistry d) all of the above 3. Many of the Bacteria in your mouth are present in biofilms on your teeth and gums. These biofilms can be hundreds of cells deep. These biofilms can be replicated in the laboratory. What technique would be best for studying the structure of these laboratory biofilms? a) TEM b) Gram staining c) Freeze-fracture SEM d) Confocal Laser Scanning Microscopy 4. Which of these statements about the cells in the biofilms in your mouth is not true? a) the cells are likely growing as fast as possible b) the cells are protected from environmental threats c) many of the cells are starving d) all of the cells are of the same type 5....
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