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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.
(1) It should have high "calorific value" or heat content. (2) It should have "moderate ignition temperature". (lgnition temperature is the minimum temperature at which it s
What is Class Polychetae - Marine Worms? The polychaetes differ from the oligochaetes in several ways. The name itself suggests one of the differences. The prefix "poly" means
Define Proteins as biological buffers? Proteins have the ability to accept or donate hydrogen ions and by doing so they serve as biological buffers. In blood, there are three i
The Km for an enzyme A. is equal to kcat, measured at low substrate concentration. B. is the substrate concentration that gives a velocity that is half the maximum velocity.
Nature and Structure of Community Every place on earth -grasslands, forests, and ponds, edge of the river or sea is shared by many coexisting organisms. Plants, animals and mi
LIST OUT THE DERIVATIVES OF 3 GERMS LAYER-ectoderm, mesoderm and endoderm
What are the best known representatives of the platyhelminth phylum? The most popular representatives of the platyhelminthes are worms that cause human diseases, like taenia an
The Waldorf family was caught in a fire but escaped. Unfortunately, the father and daughter suffered burns. The father had second-degree burns on his entire chest, abdomen, and bot
Q. How are the nervous and the symmetry system characterized in echinoderms? Adult echinoderms, along with cnidarians, are the animals that present radial symmetry that is thei
Kingdom Monera The monerians are structurally the simplest of all living things. They have apparently changed little since they first appeared on the earth. Their structure is
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