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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.
Define about the nutritional deficiencies? The nutritional deficiencies which have been identified in the group of elderly are of total calories, protein, vitamin A, vitamin C,
State one benefit of including vegetable fibre (roughage) in the diet Vegetable fibre retains water (keeping the faeces soft and bulky), stops constipation, decreases the
Difference between Distant object and Near object - Distan t object Near object 1. Parallel light reaches to eye. 2. Ci
Describe ASD closure and VSD closure in heart dieases? ASD Closures : Small ASD's can be closed directly. Others will need a pericardial patch. Piimum ASD and Sinus Venosus A
whats the meaning of asexual reproduction
Explain Low birth weight infants (LBW)? One-third of the babies born in US are of low birth weight, less than 2.5 kg. A LBW infant has an inadequate mineralized skeleton, poorl
Difference between Reproduction System of man and rabbit - S.No. Man Rabbit 1. 2. 3.
G L YCOGEN Polymer of a-D-glucose. It has 5000-30000 units of a-D-glucose. Glycogen is glucosan homopolysaccharide which is the major reserve food of animals, fungi and
Explain electrocardiography? What is meant by P-Q interval and S -T interval in electrocardiography? Mention two medical applications of this method.
Explain solid salt and saturated aqueous solution? In this example, the equilibrium system consists of crystalline PbCl 2 and an aqueous phase containing the species H 2 O, P
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