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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.
In designing an experiment to find out whether light is required for photosynthesis (a) what is the principle of the design (b) what control would you use?
What are all teh parts of a simple ciliated columnar epithilial cell?
CONCEPT AND MEANING OF EVALUATION: Evaluation of programmes is critical for measuring various community health services The ultimate reasons for doing evaluation is to ensure
How do derived characters help cladistic taxonomists determine phylogenetic relationships? A derived character is found only between members of a particular group. Thus, cladi
What is Large Intestine in human biology? Food undigested in the small intestine is passed on by peristalsis into the large intestine, or colon. The intestine is composed of ci
what is tissue
What is osmotic pressure? Osmotic pressure is the pressure formed in an aqueous solution by a region of lower solute concentration upon a region of higher solute concentration
What is Bidirectional Glenn (BDG) without Cardio Pulmonary Bypass Surgical approach is through median sternotomy. If there is only a single superior vena cava some surgeons pre
What are synthetic auxins and what are their uses? Synthetic auxins, like indolebutyric acid (IBA) and naphthalenic acid (NAA) are substances same to IAA (a natural auxin) but
Describe Prostaglandin - Availability, Administration and Alternatives ? Prostaglandin El (available in India as Prostin VR, Pharmacia) is a very essential drug and should be a
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