Section #: 22.4
Early Life on Earth
Practice Test
1.
What event caused the extinction of acritarchs near the end of the Proterozoic?
SC.D.1.4.3
a.
global warming
b.
the Varagnian glaciation
c.
outgassing
d.
formation of ozone
Hint
2.
__________ are the building blocks of proteins.
SC.F.1.4.1
a.
DNA and RNA
b.
Amino acids
c.
Cyanide molecules
d.
Formaldehyde molecules
Hint
3.
What were the type of life-forms that existed before the Proterozoic?
SC.D.1.4.3
a.
prokaryotes
b.
fungi
c.
eukaryotes
d.
algae
Hint
4.
The energy and nutrients necessary for the origin of life can be found near __________.
SC.D.1.4.3
a.
hydrothermal vents
b.
transform faults
c.
trenches
d.
magma chambers
Hint
5.
Which type of cell shown in the figure existed first?
SC.D.1.4.3
a.
it is impossible to tell
b.
B
c.
A
d.
both came into existence at the same time
Hint
6.
What did organisms of Earth's first 4 billion years have in common?
SC.D.1.4.3
a.
They were single-celled organisms.
b.
They breathed oxygen.
c.
They were multi-celled organisms.
d.
They were photosynthetic.
Hint
7.
Fossils of __________ from late Proterozoic rocks are found in all parts of the world.
SC.D.1.4.3
a.
trilobites
b.
the Ediacaran fauna
c.
corals
d.
the Burgess Shale fauna
Hint
