anonymous
  • anonymous
What does Chargaff's rule state? And what did Watson and Crick do?
Biology
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
Chargaff's rule stated that DNA from any cell of all organisms should have a 1:1 ratio of pyrimidine and purine bases and that adennine is to thymine while guanine is to cytosine.
abb0t
  • abb0t
if you have 40% G-C, that means you have 20% G and 20% C. hence, you have 60% A-T pairs.
anonymous
  • anonymous
So it doesn't mean that it has to be 50-50, right?

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abb0t
  • abb0t
50:50 is the same as 1:1 ratio or 1.
anonymous
  • anonymous
Duh! Okay, sorry, I wasn't thinking there. What about Watson and Crick?
anonymous
  • anonymous
Watson and crick found out about the structure of DNA (spiral staircase shape)
abb0t
  • abb0t
What about them? They proposed the structure of DNA being a double helix.
abb0t
  • abb0t
Along with MANY other things.
anonymous
  • anonymous
Okay.. and what about Transcription and Translation? I can't recall which is which.
abb0t
  • abb0t
What does it sound like? Translation kind of sounds like "translate" right? And to translate means to kind of interpret information..... transcribe is to copy...to copy something onto something or whatever...
anonymous
  • anonymous
Oh! So in translation, the DNA is decoded? Or.. yeah?
abb0t
  • abb0t
yes. it the mRNA is transcribed into a protein. For instance, if you speak english but you need someone to translate for you instructions on how to rob a bank, WHICH was given to you by your boss. you must ask someone to translate for you. Well, in molecular terms, that translator is called a ribosome. Ribosome "translates" the english instructions that mr. big boss gave to you to the chinese man that you asked to rob a bank. it's very similar.
anonymous
  • anonymous
That was pretty complicated, but the mRNA is transcribed?
abb0t
  • abb0t
DNA is transcribed.
abb0t
  • abb0t
sorry i means mRNA is translated.
anonymous
  • anonymous
Ohhhh! Okay, that's fine, just confuse me a bit. :) So what does tRNA do then?
anonymous
  • anonymous
tRNA matches up with the codons like for ex- ACG would be TGC i think
anonymous
  • anonymous
Urrrrrgghhh.. So I get the whole matching A with T and C with G.. but when it's RNA, A is paired with U, which is uracil.. right?
anonymous
  • anonymous
if you have any issues with translation this youtube video is really helpful ----> http://www.youtube.com/watch?v=5bLEDd-PSTQ
anonymous
  • anonymous
Oh thank you!

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