Download L15.8 Assessment

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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
Why did oceans not exist on Earth nearly 4 billion years ago?
a. No water molecules were present
b. Water remained a gas because Earth was very hot
c. Water existed as ice because the Earth was very cold
d. There was no oxygen gas in the atmosphere
The first organisms on Earth were most like today’s
a. Bacteria
b. Eukaryotes
c. Multicellular organisms
d. DNA molecules
In Miller and Urey’s experiment, several ______________, which are the building clock of
proteins, began to accumulate.
a. Amino acids
b. DNA molecules
c. RNA molecules
d. Water molecules
What was the energy source to fuel the chemical reactions that sparked life on this planet?
a. A match
b. Gasoline
c. Lightening
d. Volcanoes