Question

question about DNA code for protein. How does the sequence of bases correspond to the sequence of amino acids?
can anyone please explain this to me . pls ( free medal )

Answer 1

I think yahoo answer has a good explanation of this.. same question were asked :) .. take a look or click on the link

https://answers.yahoo.com/question/index?qid=20110530105326AAYCcux




As you probably already know, the DNA base sequence contains only 4 bases: A (adenine), G (guanine), C (cytosine) and T (thymine). They are arranged in specific orders. Certain sections of the sequence are called genes, because these sections encode for different proteins. The process of converting the DNA 'message' into a string of amino acids forming a protein is called transcription and translation. (There's some processing in between the two processes, but we won't talk about that here because it's too complicated.)

In short, transcription involves reading the gene and transcribing out an altered copy of the message, called mRNA. Transcription occurs in the nucleus.
The mRNA moves out of the nucleus into the cytosol, where translation occurs. This involves a ribosome clamping onto the mRNA and reading the sequence 3 bases at a time. Each 3-base segment is called a codon. Depending on the sequence of bases in the codon, the ribosome will grab a corresponding amino acid (carried by a tRNA molecule) that has been floating around in the cytosol and stick it on the the chain of amino acids it's making. Researchers have worked out a table of which sequence in the codon will correspond to which amino acid that is chucked on. You can find the table here: http://www.glogster.com/media/2/10/38/7/10380782.gif

When the ribosome has finished reading through the mRNA, it lets go of the amino acid chain or protein it's made.

Hope that helps!

Answer 2

Thanks