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Take Test: W6 Quiz
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Question 1
Some bacteria can form resting structures called ___________ that can withstand extremes in temperature moisture and radiation.
symbionts
viroids
prions
endospores
capsids
5 points
Question 2
All but one of the following are false regarding protists. Identify the true statement.
Most protists are single-celled organisms; some are multicellular.
Protists have cell walls composed mainly of peptidoglycans.
All protists are single-celled organisms.
Protists are prokaryotic.
Protists do not have the ability to move on their own.
5 points
Question 3
What is the main difference between protists and bacteria?
Protists cannot cause infections bacteria can
Protists are unicellular bacteria are multicellular.
Protists have a nucleus bacteria do not
Bacteria are always gram-negative protists are gram-positive
Bacteria have DNA protists do not.
5 points
Question 4
The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured
aerobic bacteria.
archaebacteria.
eukaryotic algae.
cyanobacteria.
chemoautotrophic bacteria.
5 points
Question 5
In bacteria the cell wall is composed mainly of
proteins.
lipids.
peptidoglycans.
various polysaccharides.
glycoproteins.
5 points
Question 6
Oxygen built up in the atmosphere approximately 2 billion years ago and
helped to form the ozone layer that is so important to life today.
destroyed ozone forming more oxygen.
could not have occurred without the oxygen coming from outer space.
occurred due to carbon dioxide being split by lightning strikes.
occurred because aerobic organisms required the oxygen.
5 points
Question 7
What term is used to indicate a characteristic that is shared and inherited from a common ancestor?
homologous trait
outgroups
cladistic trait
analogous trait
derived trait
5 points
Question 8
Of the following which kingdom contains the most diversity in terms of DNA sequences?
Protista
Plantae
All of these are approximately equivalently diverse.
Fungi
Animalia
5 points
Question 9
Paleontologists have found fossils dating back 3.6 billion years. These closely resemble
fungi.
blue-green algae present today.
small invertebrate animals.
nothing alive today.
todays simplest plants.
5 points
Question 10
During which geological era did Pangea break apart?
Archean
Proterozoic
Cenozoic
Mesozoic
Paleozoic
5 points
Question 11
Prions are composed of
DNA.
protein.
RNA.
DNA and protein.
DNA RNA and protein.
5 points
Question 12
Endospores form
during binary fission.
when the environmental conditions are favorable.
in response to adverse conditions.
to produce two offspring from every one parental cell.
as a means of genetic recombination.
5 points
Question 13
Kelps are a form of what group of protists?
ciliates
dinoflagellates
slime molds
brown algae
water molds
5 points
Question 14
Rickettsias belong to which major group of bacteria?
cyanobacteria
proteobacteria
viruses
Archaea
spirochetes
5 points
Question 15
Most bacteria are
photoautotrophs.
heterotrophs.
chemoautotrophs.
symbionts.
microbial predators.
5 points
Question 16
Which form of bacterial cells is rod shaped?
spirilla
bacilli
vibrios
cocci
rhodius
5 points
Question 17
Atmospheric chemists think that Earths first atmosphere
contained no oxygen atoms.
was very similar to todays atmosphere.
consisted of carbon in the form of carbon monoxide.
consisted of carbon in the form of carbon dioxide.
contained nitrogen in the form of ammonia and nitrogen gas.
5 points
Question 18
Eukaryotic cells are thought to have
evolved before prokaryotic cells.
developed when mitochondria grew much larger in size that they had been previously.
first appeared with tough cell walls.
appeared about 2.1 billion years ago.
first appeared as parts of multicellular organisms.
5 points
Question 19
When taxonomists classify organisms using a phylogenetic approach they are most concerned with
cladists.
ingroups.
ancestral traits.
derived traits.
outgroups.
5 points
Question 20
The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would
protect the animal from osmotic pressure.
be a disadvantage for these organisms and lead to their death and fossil formation.
allow the animals to move into different environments easily.
protect the animal from predators.
make these animals more desirable to predators.
5 points
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