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biology year 11 origins of life

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m t

on 29 July 2011

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Transcript of biology year 11 origins of life

hydrothermal vents Group 7 Geothermally heated water expelled from vents near volcanically active plates. hot springs, fumaroles and geysers hot spring fumarole geyser Biologically more productive!
Often hosting complex communities fueled by the chemicals dissolved in the vent fluids. Supports chemosynthetic archaea
(which are one of the first simple organisms) thus proving that the hydrothermal vents are like the environments found on early earth! Günter Wächtershäuser proposed the Iron-sulfur world theory and suggested that life might have originated at hydrothermal vents. shot up along with hydrothermal fluids into cooler waters life amino-acid
synthesis formation of peptides and protocells lower temperatures and the presence of clay minerals fostered amino-acids Numerous species of extremophiles and other organisms currently living immediately around deep-sea vents, suggesting that this is indeed a possible scenario. deep-sea vents 400–450°C H2S, CH4 and NH3 Complex chemical reactions in and around ancient deep-sea vents may have synthesized amino acids and other organic molecules key to the spontaneous origin of life. david :D Analyse information from secondary sources to discuss the diverse environments that living things occupy today and use available evidence to describe possible alternative environments in which life may have originated. 3.4 Archaea prokaryotes (such as methanogens, thermophiles, and halophiles) occupy extreme environments that are usually impossible for other organisms to survive in. these environments may include: extreme environments • Extremely hot
• Extremely cold
• The surface of the ocean
• Deep in the ocean
• Salty
• Alkaline
• Acidic
• Oxygen-rich
• Anaerobic Methanogens are Archaea which are found in anaerobic environments as oxygen is toxic to them. Today they are found in environments such as digestive tracts, mud and sewage treatment plants.

Halophiles are salt loving bacteria and unlike methanogens they are aerobic. Salty environments in which halophiles are found include salt lakes, ponds and mangroves. Thermophiles are found in extremely hot conditions. The conditions on which these Archaea currently live are very similar to that of early earth, making them vital in understanding the survival of early organisms and evolution.
Volcanoes, deep ocean hydrothermal vents and hot springs are places of the current earth that thermophiles are found. The environments in which these ancient Archaea prokaryotes occupy give some clue to what conditions were like on early earth. This gives scientist insight into possible alternative environments live may have originated from. conditions like early earth zoe :)
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