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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.
CHARACTERISTIC S OF POPULATION - Each population envolves adaptations suited to its own locality. Population is unit of evolution. Population is also an ecological uni
Q. Conditions Necessary for Outbreak of staphylococcal food? The following conditions are necessary for an outbreak of staphylococcal food poisoning: 1. The food must conta
Explain the Magnesium Deficiency and Toxicity? Deficiency of magnesium is rare for two reasons: frstly, the mineral is widely distributed in the foods, secondly, kidney is able
Q. List the parameters used to differentiate between osseointegration and fibro osseointegration. The parameters used are: a) Pain b) Rigid fixation - mobility scale, pe
If the generation time (t) is the incubation time (t) per generation (G), or t = t/G, rewrite the formula you derived in question 2 for bacterial population growth in terms of incu
Why is the cartilage more flexible than bone? in general, why does cartilage take longer to repair than bone?
Define the Bioavailability of Vitamins? The term bio availability refers to the overall efficiency of utilization, including physiological and biochemical processes involved in
Tricks of learn a classification (molusca,arthopoda,prifera etc.)
As heart failure sets in, there is activation of RAS (Fig 2.1). Adrenergic stimulation of beta-1 receptors in juxtaglomerular apparatus of the kidneys results in release of renin.
What is ascaris? What is the disease caused by this worm? Ascaris, or Ascaris lumbricoides, is an animal of the nematode phylum, i.e., a roundworm. Ascaris causes ascariasis, a
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