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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.
why is obelia considered to be of special interest in Zoology as an animal showing an intermediate grade of organisation
Ed Rivers, a 3rd year medical student, was alone in the hospital ER one night. It was unusually quiet that night, and the resident was getting some much needed sleep. A patient, Mr
Define the Clinical experience of anorexia nervosa? Clinical experience suggests that many of the untoward consequences of refeeding can be minimized or avoided by starting the
Why do ribosomes move along mRNA during translation? During translation the ribosome always exposes two mRNA codons to be translated by moving along the mRNA. When a peptide bo
Various integral proteins have multiple membrane-spanning -helices. Bacteriorhodopsin, a protein found in a photosynthetic bacterium captures the energy from light and uses it to
Describe the Dinosaurs in multimedia Tutorials? Travel back to a time when dinosaurs ruled the earth. Learn about the different types of dinosaurs and practice building your ow
Cytosketal Mechanism There are two co-ordinate processes in the cleavage (or cell division) that is displayed in Figure. Karyokinesis The mitotic division of nucleus
Explain the Techniques of Culturing? In the last practical we learnt how to prepare culture media. This practical has been introduced to make you aware of the technique of sub-
Define Petri Plates - Food Microbiology? Petri plates were discovered by Richard Petri in Ninteenth century (1887). It consists of two dishes. Look at the Figure which illustra
give a detail account of modes of locomotion in protozoa
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