origin of life

7/17/2019 origin of life

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The origin of life

Instructor: Nguyên Thi Thu Thy

Prepared by: Nguyên Bo Khnh & Đông Đc !"#ng

The evolution of Earth and solar system

Active assignment:



You and I have something fundamental common, we are both alive, we are also

surrounded an uncountable variety of liv



But where did all this life cofrom?

To answer that uestion, we need to understa



!ife

"any scientists describe life as an o#en system that constantenergy from its environment in order to maintain its own inter#rocesses. &e call this com#le$ maintenance a metabolism.

'ow does life manage to do this?

&ith something biologist !eslie (rgel called )s#eci*ed com#le

has a biological memory of its own environment encoded in hmolecules. (n our island of life, all that information is encodebasic code: deo$yribonucleic acid better -nown as /A.



Then life does something else interesting. !ifere#roduces its own information and as a resultof di0erential survival, life changes over time ina symbiotic way with the environment, or it

#erishes.



But when did it *rst start to occur on Earth?



&hen the Earth *rst formed, it loo-ed nothing li-e it does today. The mcloser, there was no water, and most im#ortantly, there was no life. Thgeology, there was chemistry, but there was no biology.

/umerous fossili1ed biological microstructures from Australia, dating to 2.ago suggests that this situation changed ra#idly. 4omehow, the Earth hadteeming with #rimitive life. &hat was going on?



Earth weathered the !ate 'eavy Bombardment, a #eriod of meteocollisions, that occurred 566 times higher than the contem#orary a

To a life7*lled #lanet, this bombardment would have been catastrolife7less #lanet, this #lanet brought gifts, including water and organcritical ingredients for life as we -now it.





The Earth now had oceans, and those oceans were *lled with com#But how did these ingredients s#ontaneously self7organi1e, into the biological structures we *nd in every cell today.



Bac- in the #resent day,

abiogenesis has #roven to be oneof the biggest mysteries formodern scientists.E$#erimentation has shown usthat it8s really hard to re#licateabiogenesis. But they have alsorevealed fascinating hints aboutthe #athway to biology. 4ome

organic molecules naturallydevelo# water7loving and water7hating membranes. This allowsfor something essential forcellular activity:

com#artmentali1ation of amino acids and nucleotides, the building bloc9/A, and /A. And conseuently, a #otential *rst ste# towards a #rotobiological machinery necessary for cellular growth and re#roduction.





&hile we have yet to uncover e$actly how this #athway wwhat we do -now is that once the genetic code for life emEarth, those *rst living forms shared their genes as liberashare ideas globally today.By sharing biological information, early life develo#ed use

ada#tations, allowing them to #ersist through su#ervolcanasteroids, and global ice ages. 4o although life is mysterimost de*nitely resilient.(ur life7*lled world stemmed from microsco#ic #ioneers tlot in common with these e$tant bacteria. This sim#le life also ma-es me wonder. Is our #ale blue dit8s ability to foster abiogenesis. (r is it a sim#le and comthroughout the universe?

!et the scientists answer thes



Than-s for your

attention

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origin of life