Quiz Ch. V

Results Reporter
Out of 15 questions, you answered 15 correctly, for a final grade of 100%.
15 correct (100%)

0 incorrect (0%)

0 unanswered (0%)

Your Results:
The correct answer for each question is indicated by a .



1
CORRECT

Prokaryotic cells have



A)
a cell wall.



B)
a nucleus.



C)
spiral-shaped DNA molecules.



D)
no pigment.






2
CORRECT

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
CORRECT

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
CORRECT

One might find the Archaea in which habitat?



A)
shallow coastal water



B)
lagoons



C)
hydrothermal vents



D)
in tissues of other organisms






5
CORRECT

Anaerobic bacteria generally



A)
require oxygen for growth.



B)
are autotrophs.



C)
cannot tolerate sulfate.



D)
are heterotrophs.






6
CORRECT

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
CORRECT

Diatoms are the most important primary producers in which habitat?



A)
the tropics



B)
very hot water



C)
polluted areas



D)
polar seas






8
CORRECT

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
CORRECT

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
CORRECT

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
CORRECT

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
CORRECT

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
CORRECT

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
CORRECT

Diatomaceous earth is used as a



A)
poison.



B)
medical compound.



C)
filtering medium.



D)
component of paint.






15
CORRECT

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.