Question

Q.N.2) A portion of a specicific DNA molecule consists of the following sequence of nucleotide triplets:

TAC   GAA    CTT  CGG

What is the DNA sequence codes for this terapeptide?

Answer 1

DNA sequence as commonly known is a process of determing the exact nucleotide sequence of a DNA segment chain. A sequence of DNA strand like the one given above is used to translate the information for replication of DNA strand. The set of nueclotides in pair of three are specific for a specific amino acid. The identification of DNA sequences is important since they carry information specific to the living, working and reproduction in an organism. They are also important to identify and in the treatment of genetic diseases.  

Now we have here portion of a specific DNA molecule with the following sequence of nucleotide triplets:

TAC   GAA    CTT  CGG [it should be GGG instead of CGG in the sequence, looks like an error]

then, transcription of DNA to mRNA according to the rule of complimentary base pairing,

T = A

A = U

C = G

we will have,

AUG CUU GAA CCC

these then are converted into the specific amino acids using standard genetic RNA codon chart,

methionine-leucine-glutamic acid-proline

It is important to note here that If the sequence is not separated in 3 series, say it was simply, TACGAACTTCGG, then the codon would turn out to be quite different and a number of combinations for the same sequence is possible. Say you start with the first or second or the next nucelotide, you will end up with different sets of amino acids.