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Which of these events occurred during the Paleozoic?

colonization of land by plants

Earth formed about __________ years ago, and the oldest known living organisms date to __________ years ago.

4.6 billion years ago ... 3.5 billion years ago

Large amounts of oxygen gas appeared in Earth's atmosphere about ______ years ago.

2.7 billion

Based on the chemical make-up of the first self-replicating molecule, it most closely resembles the structure of certain types of:

viruses

Self-replicating molecules are thought to have appeared about:

4 billion years ago

The most likely location of where ribozymes developed is:

in hot-springs

Which of the following statements best describes the end result of bacterial conjugation?

One cell has given a copy of a plasmid to another cell and kept one copy for itself.

From which cell does the sex pilus originate during bacterial conjugation?
From which cell does the sex pilus originate during bacterial conjugation?

The donor cell

True or False. During bacterial conjugation, the recipient cell receives a single-stranded loop of DNA.

True

One major difference between eukaryotes and prokaryotes is that __________.

eukaryotes' survival is limited to a few environments, whereas some prokaryotes have adapted to a variety of extreme environments

The endosymbiotic theory states that __________; one piece of evidence supporting this theory is the fact that __________.

mitochondria and chloroplasts originated as ingested prokaryotes ...mitochondria and chloroplasts have their own DNA

In the soil, some ______ convert nitrogen to a form that can be used by plants.

prokaryotes

After a long period of coevolution, the photosynthetic bacterium consumed by the predatory cell became the cellular organelle known as the:

chloroplast

After a long period of coevolution, the aerobic bacterium consumed by the predatory cell became the cellular organelle known as the:

mitochondrion.

The bacteria initially persist in the predatory cell because:

the predatory cell is unable to digest the bacteria

Eukaryotes that are not fungi, animals, or plants are classified in a "catch-all" category called ______.

protists

The first organisms to colonize land were

plants and fungi

Which prokaryotic group is most closely related to eukaryotes?

Archaea

Speciation requires ______.

genetic isolation

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