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Through the year of 1960s, the gene was clearly explained as the region of DNA which gives increase to a single polypeptide or to a one RNA for genes whose final product is RNA not protein, example for. Ribosomal RNA genes. The existence of operons in prokaryotes did not challenge this concept because, although several clustered genes produced a one polycistronic mRNA, one could still recognized one DNA regions as genes based on the distinct polypeptides they encoded. The concept even accommodated the discovery in which various protein- coding genes in eukaryotes comprise coding regions (exons) separated by noncoding sequences (introns) since, again, only single polypeptide was encoded by this region of DNA. More recently, moreover, other mechanisms have come to light in eukaryotic cells that can lead to a various of polypeptides being produced from a one DNA sequence; for instance alternative RNA splicing substitute polyadenylation sites and RNA editing. Nevertheless, in each of these cases the protein products are closely related through sequence and all are derived from the same single region of DNA. Thus the original definition perhaps needs tweaking to indicate in which a protein-coding gene is a region of DNA which encodes a one polypeptide or a group of closely- related polypeptides but otherwise the definition is intact. The substitute scenario to regard a one DNA sequence which gives rise to say 10 closely- related polypeptides by post-transcriptional processing as representing 10 genes would certainly not fit in with accepted practice.
What do you mean by Pelvic Girdle? Bones in vertebrates which connect the appendages on left and right side of the posterior appendicular skeleton to each other. Pelvic girdles
Seed Formation A mature seed has seed coat, an embryo and reserve food material in the endosperm in monocots and in cotyledons in the dicots. Figure shows structure of dicots
phylum platyhelminthes
Define Role in Glucose, Lipid and Nucleic Acid Metabolism? Chromium leads to a decrease in blood glucose concentration in people with elevated glucose levels and an increase in
A) General Characteristics 1) It should be a well-ripened natural product. 2) It should be clear and visually transparent. 3) It should be extracted with the help of a
Q. Show Complications of Mitral Stenosis ? Hemoptysis It is a common complication in patients with mitral stenosis and is related to the severity of mitral stenosis. Pulm
excretory organs in spiders?
hpw many neurons do we have?
Explain Jugular venous pressure and pulsation in details? The jugular venous system is in direct continuity to right atrium in systolic extending to right ventricle in diast
what is wrong with pasteurs conclusion
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