Although Howard is almost right, the DNA sequence does not precisely relate to the protein sequence. First of all, the DNA is transcribed to an primary mRNA molecule. Bur before the mRNA is ready to be translated into an amino acid sequence, it must be processed into a mature mRNA.

This includes adding a 3' poly A tail, and a 5' cap, and importantly for this question, splicing.

Splicing is the removal of non protein coding intermediate sequences called introns from the protein coding regions (exons) of a primary mRNA. This means that lots of the DNA sequence is not dictated by the final protein, as many of the intervening sequences have been removed by splicing.

8 0

3 years ago

Which of the following mutations of the trpL region would be least likely to affect attenuation of trp operon transcription?

kap26 [50]

Answer: C

Explanation:

For example, in trp-operon, an abundance of tryptophan. coli inhibits the expression trp-operon genes.

Trp operon is a negative repressible feedback mechanism

trpR gene is expressed continually at a low level

6 0

3 years ago

How does the cardiovascular system helps the body get rid of carbon dioxide???

dem82 [27]

Http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072434/

There is a website with some info. Hope it helps! :)

6 0

3 years ago