DNA

transcrição do DNA - Biologia

Category:

Science & Technology

Tags:

• dna
• rna
• tradução
• transcrição
• biologia
• pirola
• celula

[karenkelly88]

video escroto u.u

[moisesdasilvalima]

Isso é replicação e não transcrição.  -.-"

[lagash7]

Esse processo é o de REPLICAÇÃO do Dna e não de o de transcrição....

[grreeknick]

Your concept of size is referred to as "surface area-to-volume ratio" and is precisely the reason why these transactions become so quick and efficient.

With respect to the errors, DNA polymerase 1 comes back by later to excise and repair problematic DNA pairings. So while there's a "copy-check" (for lack of a better term) functions, there're enzymes that give a second look at the DNA to perform a "QA" check.

[gunblade64]

It's fast because it can :)

Imagine a giant of 100 feet tall, and a midget of 3 feet.

I bet the midget will be faster than the giant in terms of body movement (not traveling in distance).

The smaller something gets, the faster it becomes and therefor less mass has to move, so i think that is why.

Of what i said before about DNA starting not just right on the beginning of the string, means that it's going to loose information during the copy-process which can not ever be retrieved afterwards.

[grreeknick]

I was shocked when I discovered how low the error rate was, considering the numbers of DNA and the speed at which it is split and transcribed.

To me it is UNNERVING that this stuff is going on in most of the cells of your body 24-7-365, at that small of a scale, and at such speed. Biology has been a real eye-opener for me.

[gunblade64]

Now there is an answer :)

Just assuming that the book is correct :

I thank you for the info.. i will look it up somewhere.

[grreeknick]

Well, a little bird (Life: The Science of Biology, 8th edition) told me. Chapter 11, section 11.4 (page 249): "The observed error rate of one for every 10^5 bases replicated would result in 60,000 mutations every time a human cell divided. Fortunately, our cells have at least three DNA repair mechanisms at their disposal:" - and it goes on to list Proofreading, Mismatch Repair, and Excision Repair.

[gunblade64]

You are telling me that i haven't got the slightest idea. Oh well.

You don't have any argumentation to proof me wrong either.

Who told you the chance to mistakes within replica's is THAT small in relation to the good replica's?

[grreeknick]

You haven't got the slightest idea about which you're talking.

1 mistake in 1 billion replications is VERY sound performance. It IS a great design.