Download - origin of life
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 1/14
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:
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 2/14
You and I have something fundamental common, we are both alive, we are also
surrounded an uncountable variety of liv
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 3/14
But where did all this life cofrom?
To answer that uestion, we need to understa
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 4/14
!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$yribonucleic acid better -nown as /A.
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 5/14
Then life does something else interesting. !ifere#roduces its own information and as a resultof di0erential survival, life changes over time ina symbiotic way with the environment, or it
#erishes.
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 6/14
But when did it *rst start to occur on Earth?
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 7/14
&hen the Earth *rst formed, it loo-ed nothing li-e it does today. The mcloser, there was no water, and most im#ortantly, there was no life. Thgeology, there was chemistry, but there was no biology.
/umerous fossili1ed biological microstructures from Australia, dating to 2.ago suggests that this situation changed ra#idly. 4omehow, the Earth hadteeming with #rimitive life. &hat was going on?
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 8/14
Earth weathered the !ate 'eavy Bombardment, a #eriod of meteocollisions, that occurred 566 times higher than the contem#orary a
To a life7*lled #lanet, this bombardment would have been catastrolife7less #lanet, this #lanet brought gifts, including water and organcritical ingredients for life as we -now it.
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 9/14
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 10/14
The Earth now had oceans, and those oceans were *lled with com#But how did these ingredients s#ontaneously self7organi1e, into the biological structures we *nd in every cell today.
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 11/14
Bac- in the #resent day,
abiogenesis has #roven to be oneof the biggest mysteries formodern scientists.E$#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.
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 12/14
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 13/14
&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
7/17/2019 origin of life
http://slidepdf.com/reader/full/origin-of-life-56900e5cc1341 14/14
Than-s for your
attention