Origin of life

Mrnjavac, Andrea (2015) Origin of life. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

The object of origin of life research is to elucitade the pathway leading from simple chemical compounds rise to the LUCA (last universal common ancestor) - the common ancestor of all organisms. Earth was formed about 4.6 billion years ago, and the first evidence of life dates 3.86 years in the past, when the Earth was still characterized by reducing conditions with an abundance of ammonia, methane, nitrogen, carbon dioxide, hydrogen and water vapor. Since there was no oxygen, the ozone layer was also missing, and UV-radiation reached the surface of Earth in whole of its intensity. There are many theories where, in the conditions that early Earth offered, life might have originated: from the idea that life came from outer space, via the hot springs on the Earth's surface to the deep-sea hydrothermal vents. Each theory has its own answer to the question whether the metabolism is the one that evolved first and later developed a molecule that was able to carry and store genetic information, or the the molecule that carried genetic information first evolved around which later evolved metabolism. However, most agree that RNA had the primary role of storing replicable genetic information which, in contrast to the more stable DNA which now plays this role, in addition to capacity to store genetic information in the form of a sequence of nucleotides also possesses catalytic activity. As well, most agree that metallosulfuric compounds, that showed a catalytic activity and are preserved today as part of biochemically important metalloproteins were extremely important for the emergence of life. We are still not able to doubtlessly answer the question "How did life originate?", but each new discovery is part of the puzzle that gives us the answer.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Franjević, Damjan
Date: 2015
Number of Pages: 26
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 14 Apr 2016 10:37
Last Modified: 14 Apr 2016 10:37
URI: http://digre.pmf.unizg.hr/id/eprint/4721

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