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Bio Chap. 25 Quiz
Terms in this set (20)
Which of the following factors weaken(s) the hypothesis of abiotic synthesis of organic monomers in early Earth's atmosphere?
1.) the relatively short time between intense meteor bombardment and the appearance of the first life-forms
2.) uncertainty about which gases comprised early Earth's atmosphere
What is true of the amino acids that might have been delivered to Earth within carbonaceous chondrites
There were more kinds of amino acids on the chondrites than are found in living organisms today.
Which of the following is a defining characteristic that all protobionts had in common?
a surrounding membrane or membrane-like structure
An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to
cause iron in ocean water and terrestrial rocks to rust (oxidize)
What is true of the Cambrian explosion?
Recent evidence supports the contention that the Cambrian explosion may not have been as "explosive" as was once thought.
Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts
The first terrestrial organisms probably were considered which of the following?
photosynthetic and prokaryotes
If two continents converge and are united, then the collision should cause
a net loss of intertidal zone and coastal habitat.
The major evolutionary episode corresponding most closely in time with the formation of Pangaea was the
On the basis of their morphologies, how might Linnaeus have classified the Hawaiian silverswords?
He would have placed them in more species than modern botanists do.
The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that
in particular environments, similar adaptations can be beneficial in more than one species.
Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearing dinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that
their feathers originally served as insulation, and only later became flight surfaces
How were conditions on the early Earth of more than 3 billion years ago different from those on today's Earth?
Only early Earth was intensely bombarded by large space debris.
Which of the following is the correct sequence of events in the origin of life?
formation of protobionts
synthesis of organic monomers
3. synthesis of organic polymers
4. formation of DNA-based genetic systems
The first genes on Earth were probably
auto-catalytic RNA molecules.
Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?
How did RNA sequences come to carry the code for amino acid sequences?
If the half-life of carbon-14 is about 5,730 years, then a fossil that has one-sixteenth the normal proportion of carbon-14 to carbon-12 should be about how many years old?
Which measurement(s) would help determine absolute dates by radiometric means?
the loss of parent isotopes
the loss of daughter isotopes
Approximately how far back in time does the fossil record extend?
3.5 billion years
What is true of the fossil record of mammalian origins?
It includes transitional forms with progressively specialized teeth.
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