Origin of life

Front

What is endosymbiosis?

Back

A theory that explains how eukaryotic cells may have evolved from prokaryotic cells through a symbiotic relationship.

Front

What did endosymbiosis give rise to?

Back

Chloroplasts and mitochondria.

Front

What is the significance of fossil layers in geology?

Back

Fossil layers help determine the relative ages of fossils, with deeper layers generally being older.

Front

Which fossil is likely the oldest if Fossil D is deeper than Fossil C?

Back

Fossil D is older than Fossil C.

Front

What does the term 'chemical evolution' refer to?

Back

The process by which life arose from non-living molecules through chemical reactions.

Front

What was the purpose of the Miller-Urey experiment?

Back

To test the hypothesis that lightning could convert atmospheric gases into organic molecules.

Front

Why is the Miller-Urey theory widely accepted?

Back

The process of synthesizing organic molecules from a mixture of gases has been successfully modeled in the laboratory.

Front

What types of organisms developed first on Earth?

Back

Prokaryotic and anaerobic organisms.

Front

What are prokaryotic cells?

Back

Single-celled organisms that lack a nucleus, such as bacteria.

Front

What are eukaryotic cells?

Back

Organisms whose cells contain a nucleus and organelles, such as plants and animals.