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Level 2 Quiz
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1

Prokaryotic cells have
A)a cell wall.
B)a nucleus.
C)spiral-shaped DNA molecules.
D)no pigment.
2

Bacteria are particularly important in ecosystems because
A)they can tolerate harsh environmental conditions.
B)some form crusts.
C)many are decomposers.
D)they accumulate oxygen in the atmosphere.
3

Unlike true algae, cyanobacteria
A)have many cells.
B)have only one photosynthetic pigment, phycobilin.
C)have a cell membrane inside the cell wall.
D)live only in the most sheltered and clean environments.
4

One might find the Archaea in which habitat?
A)shallow coastal water
B)lagoons
C)hydrothermal vents
D)in tissues of other organisms
5

Anaerobic bacteria generally
A)require oxygen for growth.
B)are autotrophs.
C)cannot tolerate sulfate.
D)are heterotrophs.
6

Like most plants, unicellular algae generally have which of these features?
A)stems
B)ability to swim
C)chlorophyll
D)complex nonreproductive cells involved in nutrient transport
7

Diatoms are the most important primary producers in which habitat?
A)the tropics
B)very hot water
C)polluted areas
D)polar seas
8

In the marine environment, bacteria are symbionts of which of these organisms?
A)deep-sea fishes
B)dead fish
C)termites
D)giant clams
9

Bacteria that carry sulfur oxidation can be found where?
A)only where there is light
B)in mud flats
C)in clean open-ocean water
D)in cold seas
10

Radiolarian ooze is more persistent than foraminiferan ooze because of which reason?
A)It is more resistant to dissolving under pressure.
B)The shells are bigger.
C)Its shells are made of calcium carbonate.
D)It accumulates on coral reefs.
11

Marine fungi may be common in which habitat?
A)hydrothermal vents
B)mangrove swamps
C)shallow bays
D)near the surface of the open sea
12

Useful features for distinguishing between protistans include all of these except which one?
A)flagella
B)covering of the organism
C)kind of locomotory structures--cilia or pseudopodia
D)nucleus
13

DNA sequencing indicates the presence of thousands of unknown species of microbes. These species may remain undescribed because
A)it's hard to identify microbes to kingdom.
B)it's hard to match the sequence to a particular organism.
C)we can't be sure that the DNA came from microbes.
D)they all live in deep, dark habitats.
14

Diatomaceous earth is used as a
A)poison.
B)medical compound.
C)filtering medium.
D)component of paint.
15

Bacteria are ecologically important because of which reason?
A)They can be epiphytes.
B)They dominate life on intertidal rocks.
C)They can cause skin rashes.
D)They carry on nitrogen fixation.





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