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In at least single eukaryote, Tetrahymena, the pre-rRNA molecule holds an intron. Erasing of the intron in running processing of the pre-rRNA does not require the assistance of any protein! Instead, in the presence of guanosine, GDP, GMP or GTP, the intron excises itself is a phenomenon known as self- splicing. This was the first expression of ribozymes, which is, catalytic RNA molecules which catalyze particular reactions. The Self-splicing introns have also been discovered in some eukaryotic mRNAs and even peptidyl transferase a main activity in protein synthesis is now known to be a ribozyme.
Evolutionary Classification Evolutionary classification combines aspects of both phenetic and cladistic systematic. Evolutionary taxonomists attempt to show in their classifica
Q. Treatment of congestive cardiac failure? A judicious and careful co-ordination between oxygen support, drug therapy and nutrient intake can help in alleviating majority of t
After the pollination how does fecundation occur in angiosperms? In these plants is fecundation dependent on water? After the pollination one of the sperm nuclei from the polle
ROLE OF A NURSE IN LEGAL PSYCHIATRY: 1) Standard Care : The nurse must function at laid down standards and keep up with the standard of care by knowing the policies & pro
basis of genetic transplantation
Define Criteria for Assessment of Vitamin B 12 Status? Low serum or plasma levels of vitamin B 12 should be the first indication of poor status and this could be confirmed
describe the cell theory and its exception
How is the concept of chromosome related to the concept of the gene? A chromosome is a DNA molecule and chromosome may contain several different genes and as well DNA portions
Explain the Acoelomates - Animals without a Body Cavity? The simplest group of animals that has bilateral symmetry and a solid body (acoelomate) is the Platyhelminthes. Phy
Cyclosis is a type of internal cell movement in which an oriented flow of circulating material is formed and maintained in the cytoplasm by the action of microfilaments. Cyclosis i
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