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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.
Give two examples in each case of organs or tissues in which you would expect (a) meiosis, (b) mitosis to be taking place a) Meiosis is likely to
Starr-Edward (S-E) Silastic Ball Valve Prosthesis : This was introduced in 1961 by Albert Stm and has different models for mitral and aortic positions. It is a cage and b
Assessment Infective endocarditis is characterised by insidious onset of fever, malaise, night- sweats and weight loss. Other signs include vomiting, fatigue, headache, mya
Why and how does the food get spoiled? There are several causes of food spoilage. These include: Growth of Microorganisms, such as bacteria, molds and yeasts, which can
Define Classification of foods based on pH? Of these, the nature of the food, primarily the pH of food, is the most significant determinant of how severely the food will be pro
Phosphorylation of glucose Glucose is converted to glucose-6-phosphate since phosphorylated intermediates do not readily penetrate cell membrane and this commits glucose t
Name some Drugs to prvent tuberculosis Pyrazinamide can cause morbilliform rash, arthralgias and asymptomatic hyperuricemia, and blocks the hypouricemic action of allopurinol (
How can we determine Solutions Solutions are a homogeneous mixture of two or more different substances. This means that the molecules of the dissolved substances (solute) and t
Determine the stage 1 implant surgery Following stage 1 surgery, prior to commencing on the prosthetic procedures in the conventional loading protocol it is critical that the s
CHARACTERISTIC S OF MAN - Humans posses erect posture and bipedal locomotion. Humans possess large sized brain. Humans are less dependent on smell. Humans possess
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