Teoria Evoluţionistă se desfiinţează

[t4ilgunn3r]

În prealabil postat de Ioan_Cezar

P.S. De la teoria cu "supa" lui Oparin au trecut vreo 90 de ani. O teorie fantomă, care bântuie fără să rodească nimic concret. Acelaşi vis: să facem organicul din anorganic (de parcă ureea - compus organic, nu ar fi sintetizată deja din compuşi anorganici - prima sinteză organică obţinută în laborator din compuşi anorganici) şi ADN din aminoacizi.

Caricatural de simplist. Şi totuşi nu funcţionează. Oare de ce?

Oparin a facut un experiment, nu o teorie. Cuvantul asta il folositi la orice, numai la ce inseamna, nu.

S-a dovedit experimental ca aminoacizii din componenta proteinelor, ca si componentele acizilor nucleici pot aparea spontan, din elemente chimice, in laborator. De asemenea, s-a dovedit experimental ca (macro)molecule anorganice se pot autoreplica. Se banuieste ca plecand de la asemenea molecule s-a dezvoltat autoreplicarea pe baza unui cod (ce numim acum informatie genetica).

Nu putem afla cum s-a intamplat cu adevarat asta, nu exista fosile, nu e nimic in istorie de cercetat. Ce se poate face este sa speculam si sa construim in laborator modele ale unor atari mecanisme. Iata o ipoteza oarecum clasica:

A simplified model of abiogenesis:

Some sequences of nucleic acids have the ability to self-replicate; that is, these sequences are able to catalyze (speed up) the reactions that enable them to make duplicates of themselves.

A self-replicating nucleic acid within a vesicle would have ample resources to produce more self-replicating nucleic acids.

As more nucleic acids replicated, producing even more copies, the vesicle would grow until mechanical forces divided it, and it would then be able to reform spontaneously into a number of smaller vesicles containing fewer copies of the nucleic acid.

Although these self-replicating molecules had the ability to copy themselves, much like modern cells this ability was imperfect – chance copy errors would provide the newly separated “protocells” with sequence diversity.

It is thought that this form of replication, combined with copy error, continued over a relatively long period of time, and inevitably lead to the natural selection of useful features of the genome, including the ability to encode for genomic function with genes and their regulatory sequences.

Once the functions considered necessary for life have been encoded, the system of self-replicating nucleic acids and phospholipids is considered to be alive, and abiogenesis is complete.