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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 are the typical vegetation and the typical fauna of the tropical forests? In the vegetation of the tropical forests broadleaf evergreen trees predominate. On the top of th
Give three examples of reflex actions. Examples of reflex actions are alter in size of the pupil of the eye in response to light intensity, blinking in response to foreign par
Q. Explain about eukaryotic organism or Fungi? Fungi are eukaryotic organisms. This means that their DNA-containing chromosomes are enclosed within a nucleus inside their cell
a) What is biological magnification? b) Describe how DDT as a water pollutant undergoes biological magnification?
Food borne intoxications are basically food borne illness caused due to ingestion of toxin produced my microorganisms (mycotoxins, bacterial toxins). Natural toxins present in food
how connective tissues are like an estuary
Water Absorption and Transpiration The rate of water absorption is controlled by the rate of transpiration. A high water potential in the atmosphere would reduce water loss fr
three types of trophic pyramids
SIGNIFICANCE OF FERTILIZATION - 1. In fertilization process number of chromosome are diploid in zygote. 2. During fertilization male & female chromosomes are combi
What is the nucleolus? The nucleolus is a small and optically dense region in the interior of the cell nucleus. It is made of ribosomic RNA (rRNA) and proteins. Single nucleus
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