Life in the Universe Practice Questions
Course Introduction
Life in the Universe explores the interdisciplinary study of the origin, evolution, distribution, and future of life beyond Earth. This course integrates concepts from astronomy, biology, planetary science, and chemistry to examine the physical and chemical conditions necessary for life, the potential habitats within and beyond our solar system, and the methods scientists use to search for extraterrestrial life. Through analyzing the requirements for habitability, reviewing the history of life on Earth, and discussing up-to-date discoveries from space missions and telescopes, students gain a comprehensive understanding of the possibilities and challenges of finding life elsewhere in the cosmos.
Recommended Textbook
Life in the Universe 3rd Edition by Jeffrey O. Bennett
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12 Chapters
1027 Verified Questions
1027 Flashcards
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Chapter 2: The Science of Life in the Universe
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60 Verified Questions
60 Flashcards
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Sample Questions
Q1) According to Kepler's 2nd Law of planetary motion, a planet moves fastest in its orbit when it is
A) undergoing retrograde motion
B) in between perihelion and aphelion
C) at perihelion
D) at aphelion
Answer: C
Q2) A scientist intuitively believes that a higher power must be present in the universe. However, she can provide no experimental data to support her belief. This is an example of
A) pseudoscience
B) hypothesis-driven science
C) nonscience
D) discovery science
Answer: C
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Chapter 3: The Universal Context of Life
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110 Verified Questions
110 Flashcards
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Sample Questions
Q1) A solid transforms into a liquid at the
A) boiling point
B) melting point
C) dew point
D) evaporation point
Answer: B
Q2) A distribution of light consisting of dark lines on a continuous background is referred to as
A) a continuous spectrum
B) an emission line spectrum
C) an absorption line spectrum
D) a broad line spectrum
Answer: C
Q3) In the outer regions of the solar nebula where temperatures were low,
A) only rock and iron could condense
B) only hydrogen compounds could condense as ices
C) hydrogen and helium gases were able to condense
D) in addition to rock and iron, hydrogen compounds also condensed as ices
Answer: D
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Page 4
Chapter 4: The Habitability of Earth
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135 Verified Questions
135 Flashcards
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Sample Questions
Q1) The most recent snowball Earth phase ended about
A) 580 million years ago
B) 10,000 years ago
C) 35 million years ago
D) 200 years ago
E) 1 billion years ago
Q2) If the temperature of the Earth warms up how does the carbon dioxide cycle respond?
A) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere
B) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production
C) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production
D) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere
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5
Chapter 5: The Nature of Life on Earth
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110 Flashcards
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Sample Questions
Q1) Lipids are more commonly known as
A) enzymes
B) fats
C) saccharides
D) carbs
Q2) The most basic definition of life which takes account of the relative importance of the six fundamental properties of living things is that life is something that can
A) grow and develop
B) respond to environmental changes
C) utilize energy
D) reproduce and evolve through natural selection
Q3) A catalyst
A) is a vital component of every chemical reaction
B) accelerates a chemical reaction but is not changed in the process
C) accelerates a chemical reaction and is thereby changed in the process
D) stabilizes the rate of a chemical reaction
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Chapter 6: The Origin and Evolution of Life on Earth
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110 Flashcards
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Sample Questions
Q1) What is the "chicken-and-egg" type problem we face when trying to decide which came first-proteins or nucleic acids?
A) proteins and nucleic acids probably looked very different before the origin of life
B) nucleic acids cannot replicate without proteins, and proteins cannot be made without nucleic acids
C) early proteins and nucleic acids were very similar to each other
D) proteins and nucleic acids are always present together at the same time
Q2) Modern mammals are descendents of
A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago
B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago
C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago
D) early mammals that killed off the dinosaurs
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Chapter 7: Searching for Life in Our Solar System
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56 Verified Questions
56 Flashcards
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Sample Questions
Q1) Photosynthetic life existing on a planet much farther from the Sun than the Earth would most likely
A) be larger than photosynthetic life on Earth but less efficient at collecting solar radiation
B) be identical to photosynthetic life on Earth
C) be larger than photosynthetic life on Earth or more efficient at collecting solar radiation
D) be smaller than photosynthetic life on Earth or less efficient at collecting solar radiation
Q2) Which spacecraft crashed into and thereby confirmed the presence of water ice in a crater close to the south pole of the Moon in 2009?
A) Lunar Prospector
B) Chandrayaan-1
C) LCROSS
D) Lunar Reconnaissance Orbiter
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8
Chapter 8: Mars
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90 Verified Questions
90 Flashcards
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Sample Questions
Q1) The water that formed many of the erosion features seen on Mars appears to have originated
A) from clouds in the atmosphere
B) from volcanic outgassing
C) comet impacts
D) from beneath the surface of the planet
Q2) Spacecraft orbiting Mars have detected hydrated minerals, such as clays, sulfates, and silica, which are known to form in the presence of
A) hydrogen
B) water
C) carbon dioxide
D) oxygen
Q3) What is the most likely origin of the Valles Marineris on Mars?
A) it is a fissure in the surface carved out by a giant impact
B) it is a tectonic fracture associated with the formation of the adjacent Tharsis bulge
C) it is a huge canyon system formed by water erosion
D) it was formed from the separation of two tectonic plates
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9
Chapter 9: Life on Jovian Moons
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54 Verified Questions
54 Flashcards
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Sample Questions
Q1) The probability of finding life in any subsurface ocean beneath the surface of Ganymede is much lower than for Europa because
A) its icy crust will be much thicker, making it much more difficult for nutrients to be transported from the surface
B) it does not have a rock/water boundary at its ocean bottom
C) there is less tidal heating
D) of all of these
Q2) The largest Jovian moon Ganymede and Titan are
A) larger than the Earth
B) larger than Mercury but smaller than the Earth
C) larger than the Moon but smaller than Mercury
D) about the same size as Mars
Q3) Life beneath the surface of Europa would most likely obtain energy from A) the Sun
B) Jupiter
C) radioactivity
D) tidal heating
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Chapter 10: The Nature and Evolution of Habitability
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60 Flashcards
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Sample Questions
Q1) Compared to today, in the future, the Sun's habitable zone will be
A) wider and closer to the Sun
B) narrower and closer to the Sun
C) narrower and farther from the Sun
D) wider and farther from the Sun
Q2) As global warming raises the moisture content in our atmosphere, storms will
A) become less numerous and less severe
B) disappear all together
C) become less numerous but more severe
D) become more numerous and severe
Q3) If we do nothing to slow our emissions of carbon dioxide and other greenhouse gases, by the end of the century the global average temperatures are predicted to increase by
A) 5 to 10 <sup>o</sup>C (10 to 20 <sup>o</sup>F)
B) 1 to 2 <sup>o</sup>C (2 to 4 <sup>o</sup>F)
C) 3 to 5 <sup>o</sup>C (6 to 10 <sup>o</sup>F)
D) less than 1 <sup>o</sup>C (2 <sup>o</sup>F)
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Chapter 11: Habitability Outside the Solar System
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100 Flashcards
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Sample Questions
Q1) When we measure the mass of a planet using the Doppler shift method, we know that it is mass
A) could well be smaller
B) could be larger or smaller
C) is exactly as measured
D) could well be larger
Q2) Which of the following stars is the hottest?
A) M7
B) A0
C) G6
D) B4
Q3) Why does the Doppler shift method of detecting extrasolar planets only give us the minimum mass of a planet?
A) because we don't necessarily know the density of the planet
B) because we don't necessarily know the angle the planet's orbit makes with our line of sight
C) because we don't necessarily know the diameter (size) of the planet
D) because we don't necessarily know the mass of the parent star very
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Chapter 12: The Search for Extraterrestrial Intelligence
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76 Verified Questions
76 Flashcards
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Sample Questions
Q1) The ratio of an organism's brain weight to body weight is thought to be roughly proportional to its
A) sex drive
B) height
C) rate of movement
D) intelligence
Q2) In 1924, scientists and the U.S. Army listened for extraterrestrial broadcasts from A) Mars
B) Venus
C) the Moon
D) Mercury
Q3) Given that our galaxy has a volume of approximately 8 × 10<sup>12</sup> ly<sup>3</sup>, what would be the average minimum amount of time to exchange messages between civilizations if there are currently 125,000 intelligent civilizations in our galaxy?
A) 800 years
B) 1,200 years
C) 200 years
D) 400 years
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Page 13
Chapter 13: Interstellar Travel and the Fermi Paradox
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Sample Questions
Q1) Which of the following represents a challenge in using antimatter as fuel for an interstellar spacecraft?
A) generating the enormous amount of energy needed to produce it
B) the problem of safely storing it
C) how to make sufficiently large quantities of it
D) all of the above represent significant challenges
Q2) Which of the following is not a solution to the Fermi Paradox?
A) no one is interested or able to communicate
B) we are unable to detect their communications
C) we are not interested in communicating
D) no one is out there
Q3) The Earth's escape velocity is defined to be the
A) minimum orbital speed for the Moon to escape from the Earth's gravity
B) minimum orbital speed for the Earth to escape from the Sun's gravity
C) minimum velocity required for an object to escape the Earth's gravity
D) velocity that objects are pulled toward the Earth's surface by gravity
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