Origin of Life on Earth

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What is the proposed origin of mitochondria and plastids?

They evolved independently within the eukaryotic cells

They were created through a process of cellular division within eukaryotic cells

They originated from the endosymbiotic relationship between two eukaryotic cells

They were formerly small prokaryotes living within larger host cells (correct)

What event is associated with the sudden appearance of fossils resembling modern animal phyla in the Cambrian period?

The Cambrian explosion (correct)

The Colonization of Land

The Oxygen Revolution

The Extinction Event

What marks the most widespread and diverse land animals including arthropods and tetrapods?

The Oxygen Revolution

Extinction Event

Colonization of Land (correct)

The Cambrian explosion

When did the human lineage of tetrapods evolve?

Around 6-7 million years ago Signup and view all the answers

What caused the extinction of many prokaryotic groups that could NOT adapt to increased atmospheric O2 levels?

Accumulation of oxygen produced by oxygenic photosynthesis Signup and view all the answers

What is a common characteristic shared by mitochondria and plastids as evidence of the endosymbiotic theory?

Utilization of electron transport enzyme similar to prokaryotes Signup and view all the answers

What is the proposed age of the oldest fossils of eukaryotic cells?

1.8 billion years Signup and view all the answers

What process caused the accumulation of oxygen in the atmosphere from about 2.7 to 2.4 billion years ago?

Oxygenic photosynthesis Signup and view all the answers

What is the driving force behind the Cambrian explosion?

The evolution of novel characteristics Signup and view all the answers

What is the significance of the endosymbiont theory in the evolution of eukaryotic cells?

It proposes that mitochondria and plastids were formerly small prokaryotes living within larger host cells. Signup and view all the answers

What event can open habitats that may result in adaptive radiation?

Mass extinctions Signup and view all the answers

Prokaryotes were Earth’s sole inhabitants for more than 1.5 billion years.

True Signup and view all the answers

The rise of oxygen in the atmosphere from about 2.7 to 2.4 billion years ago caused the 'oxygen revolution'.

True Signup and view all the answers

The Cambrian explosion refers to the sudden appearance of fossils resembling modern plant phyla.

False Signup and view all the answers

Origin of Life on Earth

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