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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.
Advantages of Pyramid of Energy A pyramid of energy must be based on determination of the actual amounts of energy that individuals take in, how much they burn up during metab
Q Lower Oesophageal Sphincter? Competency of LES (Lower Oesophageal Sphincter) is important. The pressure of this sphincter is controlled by many factors, one of which is hormo
What is the difference between the lateral and the apical buds of the plants? Lateral buds are portions of meristematic tissue situated in the base of the shoots. Apical bud
Features of Plant Hormones The following are the important features of the role of plant hormones in growth and development: The hormone may initiate one response
What are the basic constituents of the cell membrane? The cell membrane is produced of lipids, proteins and carbohydrates. The membrane lipids are phospholipids, a special t
whats polymorphic
Define Dietary habits factor for obesity? You are aware that a positive energy balance is one of the major contributory factors for obesity. Some people are in the habit of eat
a) Where casparian strips situated in a plant body are and what are they made up of? Mention its function. b) What is respiration quotient (RQ)? Under what conditions will th
What compound composes most of the cell membrane? How is this compound suited to the function of the membrane? Phospholipid composes most of the cell membrane. The hydrophob
General characters of phylum protozoa
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