Exam 17: Astrobiology: Life on Other Worlds

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What organism today is most similar to the first cells on Earth?

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carries the genetic material of a cell
mutation
a long spiral molecule coded with information within the nucleus of a cell
RNA
a segment of chromosomes that controls a certain function within a cell
amino acids
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carries the genetic material of a cell
mutation
a long spiral molecule coded with information within the nucleus of a cell
RNA
a segment of chromosomes that controls a certain function within a cell
amino acids
errors or damage made to the DNA molecule
carbon
the building blocks of proteins
natural selection
compounds for structure and function of an organism
genes
the backbone element of all living things
DNA
regulators of chemical reactions within a cell
proteins
a carrier of coded information to various location within the cell
chromosomes
variations over time for an organism's survival
enzymes
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What part of a cell stores the coded information?

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What period of Earth's geologic history saw a dramatic increase in life?

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In 1974, astronomers sent an anticoded message as a string of 1679 _______________ and _______________.

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What was Miller and Urey trying to replicate in their experiment?

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Can there be life on Mars? Is there proof that life existed on Mars? Defend your answer.

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Which celestial body is the most likely candidate for life to emerge and evolve?

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Which telescope did astronomers use in 1974 to send an anticoded message to globular cluster M13?

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Evolution is a random process.

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If we have the technology to transmit messages, then why can't we "carry on a conversation" with an alien civilization?

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Life began in the sea.

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A(n) _______________ can thrive in extreme conditions, such as ice-covered lakes in Antarctica, far underground inside solid rock, amongst the cinders of summits of extinct volcanoes, or in pools of acids.

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One theory for the origin of life proposed that reproducing molecules may have arrived here from space.

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What is the function of proteins?

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The chemical recipes of life are stored within each cell as information in _______________ molecules that resemble a ladder with rungs, composed of chemical bases.

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A unique property of water is that it ____.

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What did astronomers use in the anticoded message sent to globular cluster M13?

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Stromatolites are rock-like columns composed of layers of fossilized ____.

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What are the two basic requirements for life to exist?

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