The Origin Of Life, Prokaryotes, And Protists: Question Preview (ID: 5085)

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The correct order of the geologic eras, from most ancient to most recent, is _____.
a) Paleozoic, Cenozoic, Mesozoic
b) Paleozoic, Mesozoic, Cenozoic
c) Proterozoic, Mesozoic, Cenozoic, Paleozoic
d) Paleozoic, Mesozoic, Cenozoic, Proterozoic

Fossils that can be used to establish relative dates are most likely to be found in _____.
a) sedimentary rock
b) the continental shelves
c) igneous rock
d) glacial till

A type of ecological relationship called _____ involves one organism living at the expense of another organism.
a) Mutualism
b) Commensalism
c) Symbiosis
d) Parasitism

The fauna and flora of Australia are very different from those of the rest of the world. Why might this be true?
a) Australia has been isolated for about 50 million years.
b) Life in Australia was wiped out by ancient volcanic eruptions
c) They have become different by convergent evolution.
d) The climate of Australia is unlike that of any other place in the world.

What is the role of heterocysts in a cyanobacterial filament?
a) They store endospores.
b) They carry out only nitrogen fixation.
c) They carry out only photosynthesis.
d) They carry out photosynthesis and nitrogen fixation.

A radioactive isotope has a half-life of 1.2 billion years. As measured by the presence of the isotope and its stable decay product, a rock originally contained 10 grams of the radioactive isotope, and now contains 1.25 grams. Approximately how many
a) .3 billion years
b) 3.6 billion years
c) 3.8 billion years
d) 2.7 billion years

Biologists are interested in the role of liposomes in the origin of life. They think that liposomes might show how _____.
a) Raw materials for organic compounds formed
b) The formation of organic polymers, such as carbohydrates and RNA, were catalyzed
c) Primitive cell membranes could form, grow, and divide
d) Energy was supplied for the metabolism of the first simple cells

Which statement below is not an explanation of how deep-sea vents may have been important factors in the origin of life?
a) They may have been the source of some of the carbon-containing compounds that cells use in energy metabolism.
b) The high temperatures associated with deep-sea vents were a source of energy for the reactions necessary for the formation of
c) Sulfides of iron and nickel common in deep-sea vents are excellent catalysts.
d) Oxygen was abundant near deep-sea vents and encouraged the formation of polymers.

Which of these groups includes unicellular organisms that, due to the structure of their cell walls, can withstand pressures equal to the pressure under each leg of a table supporting an elephant?
a) euglenids
b) ciliates
c) apicomplexans
d) dinoflagellates

The early atmosphere on Earth is thought to have lacked which one of the following gases?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Methane

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