WorksheetsThe Precambrian
Total questions: 20
Worksheet time: 14mins
The current ocean crust is much like the Earth’s first crust
True
False
Precambrian greenstone indicates the presence of
volcanoes
subduction zones
cratons
rift valleys
Banded-iron formations are important because they
represent the time that large amounts of oxygen entered the atmosphere.
were deposited mostly during the Cambrian Explosion of life.
represent the first crust that solidified on Earth.
are the result of the evolution of cellular respiration.
A eukaryote is different from a prokaryote because it has a (a) .
Prokaryotic cells can replicate themselves better and so they are more common than eukaryotic cells.
True
False
During the Precambrian
all continents were small microcontinents.
there was a supercontinent called Rodinia the whole time.
large lava flows indicate that the supercontinent Rodinia broke up.
there was a solid crust that had solidified like the Moon’s crust.
Blue-green algae are modern (a) .
The building blocks of life are
amino acids
proteins
covalent bonds
none of the above
One hypothesis is that Earth was covered with ice about 700 million years ago.
True
False
(a) is the chemical work of cells
Photosynthesis uses carbon dioxide and nutrients in the presence of sunlight to create
food energy and ozone.
chloroplasts and ozone.
food energy and oxygen.
life.
Peptobismo chains are polymers that link together amino acids to form proteins.
True
False
Scientists know that the chemical reactions that make up the metabolism of modern organisms evolved very early in Earth history because
fossils show the same metabolic pathways as modern organisms.
there is no other type of metabolic pathway that life could possibly have.
very simple bacteria and the most complex organisms today have the same metabolic pathways.
none of these.
(a) are molecules that pass genetic information to the next generation.
Cells may first have come together because
clays provided the structure for organic molecules.
prokaryotic structures had a symbiotic relationship.
the molecules began to photosynthesize.
all of these.
The abundance of (a) in the Precambrian era caused oxygen levels to rise in the atmosphere.
How old are many of the Precambrian shields?
5.7 billion years old
570 million years old
57 million years old
5.7 million years old
A (a) relationship is one in which biological units (cells, organisms) help each other but do not harm each other.
Which of the following sentences is true?
Nucleic acids carry genetic information from one generation to the next.
Genetic information was probably first carried by RNA.
The replicator for modern organisms is DNA.
All of these.
(a) is the process that producers use to convert carbon dioxide into simple sugars.
