Bio I Ch. 17 Test A
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Sedimentary rock is formed from
a. | the soft parts of organisms. | b. | the hard parts of
organisms. | c. | small particles of sand, silt, and clay. | d. | wood, shell, and
bone. |
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2.
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What proportion of all species that ever lived has become extinct?
a. | less than 1 percent | c. | more than 99 percent | b. | approximately one-half | d. | 100 percent |
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3.
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To be useful as an index fossil, a species must have existed for a
a. | long period over a wide geographic range. | b. | long period over a
small geographic range. | c. | short period over a wide geographic
range. | d. | short period over a small geographic range. |
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4.
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The basic divisions of the geologic time scale from larger to smaller are
a. | eras and periods. | b. | periods and eras. | c. | relative and
absolute dates. | d. | billions of years and millions of years. |
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5.
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The Mesozoic Era occurred
a. | before Precambrian Time. | c. | after the Paleozoic
Era. | b. | during Precambrian Time. | d. | after the Cenozoic Era. |
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6.
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Which of the following was NOT characteristic of Earth before the oceans
formed?
a. | volcanic activity | b. | bombardment by comets and
asteroids | c. | an atmosphere of poisonous gases | d. | an atmosphere containing oxygen
gas |
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7.
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Two gases that probably existed in Earth’s early atmosphere are
a. | oxygen and hydrogen sulfide. | b. | water vapor and oxygen. | c. | oxygen and carbon
monoxide. | d. | hydrogen cyanide and carbon monoxide. |
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8.
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What prevents organic molecules from forming on their own and remaining intact
today?
a. | Earth is too hot. | b. | Atmospheric oxygen is too
reactive. | c. | The necessary building blocks no longer exist. | d. | There is no energy
source available. |
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9.
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One necessary condition for the evolution of the first life on Earth was
a. | the presence of DNA. | b. | abundant oxygen in the
atmosphere. | c. | the presence of photosynthetic organisms. | d. | the presence of
liquid water. |
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10.
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Which of the following functions can RNA perform under certain
conditions?
a. | catalyzing chemical reactions | b. | processing messenger RNA after
transcription | c. | helping DNA replicate | d. | all of the
above |
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11.
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Why did the development of sexual reproduction speed up the process of
evolution?
a. | Sexual reproduction occurs more rapidly than asexual
reproduction. | b. | The offspring of sexual reproduction are identical to their
parents. | c. | Sexual reproduction increases genetic variety. | d. | Sexual reproduction
limits genetic variety. |
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12.
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What was the response of the various groups of early organisms that existed when
oxygen levels rose in the atmosphere?
a. | Some life forms became extinct. | b. | Some life forms survived in only a few airless
habitats. | c. | Some life forms evolved metabolic pathways that used oxygen for
respiration. | d. | all of the above |
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13.
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The Cambrian Explosion resulted in the evolution of the first
a. | dinosaurs and mammals. | b. | representatives of most animal
groups. | c. | bacteria. | d. | land animals. |
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14.
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The process by which two species, for example, a flower and a pollinating
insect, evolve in response to each other is called
a. | convergent evolution. | c. | coevolution. | b. | adaptive radiation. | d. | punctuated
equilibrium. |
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15.
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In the past, mass extinctions encouraged the rapid evolution of surviving
species
a. | by changing developmental genes. | b. | by making new habitats available to
them. | c. | because they killed all organisms that had coevolved. | d. | because they spared
all organisms that had evolved convergently. |
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Completion
Complete each
statement. Word Bank. You must spell correctly.
microfossils,
extinct, mass extinction,
DNA, nitrogen
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16.
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In a species that has become ____________________, all members have died, and
the species has ceased to exist.
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17.
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Earth’s least dense elements, including hydrogen and ____________________,
formed the planet’s first atmosphere.
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18.
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It is possible that RNA was the first information-storing molecule, but over
time, ____________________ became the primary way in which genetic information is stored and
transmitted.
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19.
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____________________, which are fossilized remains of single-celled organisms
similar to modern bacteria, exist in rocks that are more than 3.5 billion years old.
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20.
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As the Paleozoic Era closed, a(an) ____________________, which is the dying out
of many types of living things at one time, occurred.
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