University of California Davis Biology Worksheet

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?

Group of answer choices

photoheterotroph

decomposer

chemoheterotroph

chemoautotroph

photoautotroph

2.

Which of the following is characteristic of gram positive bacteria?

Group of answer choices

their cell walls are made of a thin peptidoglycan layer

they have an extra outer membrane

they stain blue or purple

they are harder to kill with antibiotics than gram negative bacteria

they are never harmful to humans

3.

Antibiotics can kill viruses.

Group of answer choices

True

False

4.

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

Group of answer choices

dinoflagellates

Trypanosoma

diatoms

amoebas

foraminiferans

5.

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

Group of answer choices

True

False

6.

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

Group of answer choices

they can all perform photosynthesis

they are all protozoans

they all move using pseudopods

they are all flagellates

they gain food primarily by absorption

7.

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

Group of answer choices

anaerobic

no nucleus

photosynthetic

no chloroplasts or mitochondria

prokaryotic

8.

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?

Group of answer choices

foraminiferan

plasmodial slime mold

ciliate

Trichonympha

amoeba

9.

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?

Group of answer choices

apicomplexan

cellular slime mold

amoeba

foraminiferan

plasmodial slime mold

10.

The oldest undisputed fossil evidence of cells comes from:

Group of answer choices

amber fossils

microfossils including foraminiferans

whole organisms preserved in ice

stromatolites

dinosaur bones