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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.
Define Solubility affecting absorption of dietary iron? Solubility is crucial for non-haem iron absorption as the inorganic iron salts have to be solubilized in the intestine f
What are the disadvantages of protozoa
functions of arteries in mammals
Diploidy and Haploidy :: In the chromosomal complement given species not all the chromosomes are different from each other .In fact these are in pairs ,i.e. every two chrom
Define Uptake of iron by enterocytes - Non Haem Iron Absorption? Ferrous iron traverses the brush border of the intestine better than the ferric iron. The mechanism of absorpti
What is the genetic condition in which the heterozygous individual has different phenotype from the homozygous individual? This situation is called lack of dominance and it can
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Lumpy skin disease The disease, reported from Sudan in 1970 and Egypt in 1988, is caused by a member of the Capripox virus. It affects cattle and is restricted to African coun
Adaptive Radiations The organisms all the time tend to establish harmony with their environment. This process, called adaptation, enables the organism to face the vagaries of
Another possible way to classify organisms would be to separate them into unicellular and multicellular organisms. Explain why this is not a useful classification system. Other
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