Earth's early atmosphere was primarily composed of

carbon dioxide, water vapor, and nitrogen

Fossilized evidence of Earth's first forms of life would consist of

prokaryotes from the Precambrian

Sexual reproduction contributes to genetic diversity by allowing

genes from 2 parents to be mixed and remixed before passing

Why did oceans not exist on Earth nearly 4 billion years ago?

Water remained a gas because earth was very hot

Urey and Miller usedwater, methane, and hydrogen to heating and cooling cycles to attempt...?

to find out if ancient Earth could have madeorganic molecule

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Duplicate of Duplicate of Chapter 19 Review

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1
Earth's early atmosphere was primarily composed of
carbon dioxide, water vapor, and oxygen
hydrogen cyanide and carbon monoxide
oxygen and carbon monoxide
carbon dioxide, water vapor, and nitrogen
2
Mitochondria and Chloroplasts are found in?
Neither Prokaryotes nor Eukaryotes
Only Prokaryotes
Both Prokaryotes and Eukaryotes
<p>Only Eukaryotes</p>
3
A new species of fossil is found on two different continents. What process is responsible?
genetic drift
volcanic eruption
mountain building
ocean and wind currents
4
Fossilized evidence of Earth's first forms of life would consist of
eukaryotes from the Precambrian
vertebrates from the Precambrian
intertebrates from the Precambrian
prokaryotes from the Precambrian
5
Genetic diversity in prokaryotes is primarily due to
mutations in DNA
the mixing of DNA during fertilization
mixing of DNA in binary fission
mutations in RNA
6
The two organelles associated with the endosymbiotic theory are:
ribosomes and Golgi complex
mitochondria and chloroplast
Mitochondria and nucleus
mitochondria and endoplasmic reticulum
7
One scientific hypothesis about the origin of life holds that
RNA replaced DNA as the most stable molecule
proteins duplicate themselves and are used in info storage
RNA existed before DNA
as cells evolved, they stopped using RNA
8
Sexual reproduction contributes to genetic diversity by allowing
genes from 2 parents to be mixed and remixed before passing
genes from 1 parent to be mixed before being passed
unmixed genes from 2 parents to be passed
1 parent to pass along a complete set of unmixed genes
9
Why did oceans not exist on Earth nearly 4 billion years ago?
There was no oxygen gas in the atmosphere
water existed as ice because Earth was very cold
No water molecules were present
Water remained a gas because earth was very hot
10
Urey and Miller usedwater, methane, and hydrogen to heating and cooling cycles to attempt...?
To explain how the dinosaurs went extinct
to find out how ozone forms in the atmosphere
to find out if ancient Earth could have madeorganic molecule
todetermine the age of microfossils

Duplicate of Duplicate of Chapter 19 Review Flashcards | StudBud