University of California Davis Biology Worksheet

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1.

Bacterium organismensis is a bacterium that lives deep in lightless caves. It oxidizes (uses) hydrogen sulfide for energy and requires only CO2 as a carbon source. What mode of nutrition does it employ?

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photoautotroph

2.

Which of the following is characteristic of gram positive bacteria?

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they are never harmful to humans

3.

Antibiotics can kill viruses.

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False

4.

Which of the following are microalgae (phytoplankton) with tests made of silica?

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During horizontal gene transfer, a bacterium can pass a copy of some of their DNA to another completely unrelated species of bacteria.

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What do Giardia, Trichonympha, foraminifera, and amoebas have in common?

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Which of the following does not describe a likely characteristic of the first cell?

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Your biology instructor shows you an organism under the microscope. It does not have a test and its surface is covered with tiny hairlike projections that it seems to be using to move and feed. What are you looking at?

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You collect an organism off an old tree stump. It does not have cell walls, so you know that it is not a plant or fungus. As it grows, it forms a pinkish, gelatinous clump. When you look at it under the microscope, you see that it is made up of many individual cells. What type of organism do you have?

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The oldest undisputed fossil evidence of cells comes from:

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