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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.
What are the main representatives of the pteridophytes? Is this plant group cryptogamic or phanerogamic? The better known pteridophytes are the ferns and the maidenhairs, from
Q. Explain about S-Shaped incision for a mini pedicle flap? The S - shaped incision is indicated where a papilla needs to be developed and was first described by Palacci. This
Practical Points in Preparation of Nursing Care Plan You first review the nursing diagnosis, then assign this priority or the order in which these are to be met. Alo
Brasseler Endo Extractor tube Insert H file buccally and lingually and remove silver by friction.If I can't remove use solvent to desolve cement If the tip of silver not appear
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How is excretion done in fishes? Fishes have a pair of kidneys that filtrate the blood. Bony fishes excrete nitrogen as ammonia, NH 3 , (they are ammoniotelic) and cartilagino
Growth Regulators Besides the major five hormones, polyamines can also exert regulatory control over growth and development at micromolar concentrations. They are widespread a
Q What are the major morphological features of arthropods? Arthropods present three distinguishing features: they are metameric beings (segmented body), they present articulate
Low levels of dissolved salts characterise the freshwater biomes. The salt content of fresh water is about 0.005 percent. The freshwater biomes consist of inland bodies of standing
Why would the O-H bond in C=O-H and the OH bonding with a water molecule be considered weak?
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