What is the DNA AACCCTGAGTCT when transcribed to mRNA ?

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Actually, the mRNA does not go to a tRNA rather it attaches to the ribosome. Here the ribosome will "read" each codon or triplet and special tRNA molecules carry the appropriate amino acid into position on the growing amino acid chain. This chain of amino acids is called a polypeptide...

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Actually, the mRNA does not go to a tRNA rather it attaches to the ribosome. Here the ribosome will "read" each codon or triplet and special tRNA molecules carry the appropriate amino acid into position on the growing amino acid chain. This chain of amino acids is called a polypeptide chain. When a stop codon is reached, the polypeptide detaches from the ribosome and proceeds to fold into a functional protein. 

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DNA is a double helix; a twisted ladder is the description frequently given. The "rungs" of the ladder are made up of pairs of nitrogenous bases: adenine (A), guanine (G), cytosine (C) and thymine (T). The bases will only pair up with one other type each: A with T and G with C. So, the "rungs of the ladder" will each be one of those sets. During replication, when mRNA is formed from one side of the opened-up double helix, the As, instead of pairing with Ts, pair up with a uracil (U). This is because RNA does not utilize thymine, only uracil. The sequence of DNA that you gave:

AACCCTGAGTCT

when transcribed into an mRNA molecule will be:

UUGGGACUCAGA

The information will be carried by the mRNA molecule out of the nucleus of the cell to a ribosome, where it will be translated into a series of amino acids, making a protein. 

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