Salut,
Je dois faire un exposé sur un thème de biologie en anglais. J'ai écrit la trame de ce que je vais dire, est ce que quelqun peut me dire si il y a des erreurs de vocabulaire, sens, syntaxe, conjugaison etc?
Merci d'avance!
LUCA : The Last Universal Common Ancestor
I'm going to speak about LUCA : the last universal common ancestor. I will follow this framework ; so first I will introduce the topic, then I will answer to the question what is luca, then why is LUCA our common ancestor and finally, I will conclude by giving you the limits of this theorical model
INTRODUCTION
One of the most important outcomes of modern biology has been the demonstration of unity of life
Lamark, a biologist of the 19 century was the first one who proposed a theory of evolution but this is Charles Darwin in the Origin of species who first stated the hypothesis that there was only one progenitor for all life forms and gave a scientific explanation of the diversification of life form that appeared in nature from a common descendent until current biodiversity.
The discovery — nearly 30 years ago by Carl Woese – that present-day life on our planet can be assigned to only three domains:two of prokaryotic nature (Archaea and Bacteria), and one eukaryoyic (Eucarya), has given birth to a new field of investigation aimed at determining the nature of Luca.
I. What IS LUCA ?
This is the acronym for the last universal common ancestor. It was a denomination proposed in 1996 by the biologist Patrick Forterre, searcher at Paris-sud university. All the living beings currently on earth : bacteria, arché, eukaryote belong to the same family. Who says familly says common ancestor. Our common ancestor is luca, this is the last common ancestor of all living beings currently on earth. In other words this is the organism which all living thing descent from. It's important not to confond LUCA which appeared probably 3 billion years ago with the first cell that appeared about 3,4 billion years ago and which engendered lines now extinguished as eliminated by luca's descendants. Thus LUCA don't represent the first life form. Also, Luca is a theorical model it is vain to look for its fossil, and he was not alone, many luca existed in its epoch.
II. WHY IS LUCA OUR COMMON ANCESTOR ?
The presence of common patterns in all life form can be explaned by the fact that they inheritated it though a common ancestor which already possessed it:
Genetic code
Translation apparatus
Use of the same molecule : DNA, RNA, amin acid base
CONCLUSION
LUCA : a theorical model allowing an advancement in the roots of life research…
… but controversal : the possibility of horizontal gene transfert contradicts the reconstruction of LUCA
Je dois faire un exposé sur un thème de biologie en anglais. J'ai écrit la trame de ce que je vais dire, est ce que quelqun peut me dire si il y a des erreurs de vocabulaire, sens, syntaxe, conjugaison etc?
Merci d'avance!
LUCA : The Last Universal Common Ancestor
I'm going to speak about LUCA : the last universal common ancestor. I will follow this framework ; so first I will introduce the topic, then I will answer to the question what is luca, then why is LUCA our common ancestor and finally, I will conclude by giving you the limits of this theorical model
INTRODUCTION
One of the most important outcomes of modern biology has been the demonstration of unity of life
Lamark, a biologist of the 19 century was the first one who proposed a theory of evolution but this is Charles Darwin in the Origin of species who first stated the hypothesis that there was only one progenitor for all life forms and gave a scientific explanation of the diversification of life form that appeared in nature from a common descendent until current biodiversity.
The discovery — nearly 30 years ago by Carl Woese – that present-day life on our planet can be assigned to only three domains:two of prokaryotic nature (Archaea and Bacteria), and one eukaryoyic (Eucarya), has given birth to a new field of investigation aimed at determining the nature of Luca.
I. What IS LUCA ?
This is the acronym for the last universal common ancestor. It was a denomination proposed in 1996 by the biologist Patrick Forterre, searcher at Paris-sud university. All the living beings currently on earth : bacteria, arché, eukaryote belong to the same family. Who says familly says common ancestor. Our common ancestor is luca, this is the last common ancestor of all living beings currently on earth. In other words this is the organism which all living thing descent from. It's important not to confond LUCA which appeared probably 3 billion years ago with the first cell that appeared about 3,4 billion years ago and which engendered lines now extinguished as eliminated by luca's descendants. Thus LUCA don't represent the first life form. Also, Luca is a theorical model it is vain to look for its fossil, and he was not alone, many luca existed in its epoch.
II. WHY IS LUCA OUR COMMON ANCESTOR ?
The presence of common patterns in all life form can be explaned by the fact that they inheritated it though a common ancestor which already possessed it:
Genetic code
Translation apparatus
Use of the same molecule : DNA, RNA, amin acid base
CONCLUSION
LUCA : a theorical model allowing an advancement in the roots of life research…
… but controversal : the possibility of horizontal gene transfert contradicts the reconstruction of LUCA