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20 Cards in this Set
- Front
- Back
Which of the following species exhibits radial symmetry? |
Jellyfish |
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Which of the following systems about the endosymbiont hypothesis explains the origin of eukaryotic cells? |
Mitochondria and chloroplasts originated from symbiotic relationships between 2 prokaryotic cells |
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What structure found in both chloroplasts and mitochondria links them to prokaryotes rather than to eukaryotes? |
circular DNA molecules |
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What happens when phospholipids are placed in an aqueous solution? |
They spontaneously form bilayers |
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What was the significance of the 1953 Miller-Urey experiments testing Oparin-Haldane hypothesis? |
The synthesis of complex biological molecules is possible in a reducing atmosphere |
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Which of the following is the primary assumption made by researchers when designing experiments to model how life may have arisen? |
Life arose on Earth from non-living matter |
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Why is the protein-first hypothesis not accepted by most scientists? |
There is no known mechanism of protein self-replication |
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Which of the following statements supports the hypothesis that life developed near hydrothermal vents in the sea floor? |
Reducing conditions exist near hydrothermal vents, along with chemicals essential for life |
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Which of the following statements about the RNA-first hypothesis for the origin of the cellular information system is true? |
Ribozymes may have functioned as both informational molecules and as catalysts in protocells |
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Where did the Earth's atmosphere originate? |
Gases were released from the Earth itself as it cooled and the atmosphere was derived from dust particles from the original gas cloud around the planet |
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In animals, a body cavity is ___________. |
a fluid-filled space in which internal organs are suspended |
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Which of the following is a characteristic of both Archaea and Eukarya? |
introns |
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Which of the following characteristics in NOT common to all animal species? |
nervous system |
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What conditions were necessary on the primordial Earth for life to begin? |
All of the choices are correct: liquid water, gravity, source of energy, evaporation of liquid water |
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It is unlikely that living cells appeared spontaneously from nonliving matter because: |
living systems are so complex |
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After organic molecules have been formed in abundance, what is the next step that must occur in the progression toward a living organism? |
aggregation of the different organic compounds so all the pre-cell building blocks are in the same localized region |
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Which of the following is essential to the Oparin-Haldane hypothesis of the nature of Earth's early atmosphere? |
the near absence of O2 |
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Protocells: |
might have been the precursors of early cells |
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Which of the following supports the controversial theory that life had an extraterrestrial origin? |
it is possible that organic compounds arrived by meteor impact |
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What feature in the first truly living cells would NOT have been found in protocells? |
all choices are correct: use of DNA as a genetic molecule, an info system, a cytoplasmic region containing ribosomes and associated enzymes, a mechanism of cell division |