LAB2answers-07

LAB2answers-07 - LAB 2 BACTERIA, PROTISTA, AND FUNGI...

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LAB 2 BACTERIA, PROTISTA, AND FUNGI Answers to the lab manual questions: Examine Spirillum volutans . What is the bacterium’s shape? The spirillum type. You see spirally-curved rods. Can you find the cell wall or the nucleus? Yes, almost all bacteria have cell walls. It is the outermost layer, outside of the plasma membrane. No, there is no nucleus. A nucleus is an organelle and bacteria do not contain organelles. How many flagella are visible at each end? You can see either 2 or 3 flagella. Explain how a lake overpopulated with oxygen producing algal growth could experience low levels of oxygen. At certain times of the year, such lakes experience fish kills. That is, large numbers of fish die and the lake is said to be “polluted” or “dying”. When algae grow very abundantly and reach very high population levels, they will eventually begin to run out of food. When this occurs, they start to die in great numbers and the decomposition of the dead algae uses up the oxygen. The water can
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This lab report was uploaded on 04/19/2008 for the course BIOL 111 taught by Professor Brianmcgill during the Winter '07 term at McGill.

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LAB2answers-07 - LAB 2 BACTERIA, PROTISTA, AND FUNGI...

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