IB Biology: A2.1-Evidence for the Evolution of the LUCA

Front

What is one hypothesis for the origin of life on Earth?

Back

The origin of life on Earth is hypothesized to be around hydrothermal vents, where hot mineral-rich water emanates from beneath the ocean floor.

Front

What evidence supports the evolution of LUCA in hydrothermal vents?

Back

Phylogenetic analysis and fossilized evidence suggest that LUCA evolved in hydrothermal vents.

Front

What temperatures do hydrothermal vents release fluids at?

Back

Hydrothermal vents release fluids at temperatures of 60 °C to 90 °C.

Front

What chemicals are found in the fluids released by hydrothermal vents?

Back

The fluids contain high concentrations of hydrogen, methane, ammonia, and sulfides.

Front

Why are the chemicals in hydrothermal vent fluids significant for early life?

Back

These chemicals represent readily accessible supplies of energy, which early cells would have needed to assemble carbon compounds into polymers.

Front

What discovery gives credibility to the hypothesis of life forming around hydrothermal vents?

Back

The discovery of entire communities of living organisms around hydrothermal vents gives credibility to the hypothesis that the earliest forms of life could have formed there.