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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.
Q How do amoebae, paramecia and trichomonas respectively move? Amoebae move by amoeboid movements small invaginations and projections of their plasma membrane (pseudopods) that
Two atoms always represent the same element if they have. A) the same number of particles in the nucleus. B) The same number of electrons. C) The same number of shells. D) The same
What are biogeochemical cycles? Biogeochemical cycles are representations of the circulation and recycling of matter in nature. The major biogeochemical cycles studied in Ec
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what type of skull does amphibians possess in general?
How is the respiratory system of beings of the phylum Annelida characterized? Respiration in annelids can be cutaneous or branchial. Cutaneous respiration happens due to the r
Elaborate the term - Gill slits. Lateral opening in the wall of pharynx which allows water to enter into mouth and exit through the pharynx. This is one of the ancestral charac
Explain Precautions for Estimation of Reducing Sugar by Fehling Soxhlet Method? 1. Clamp the burette so that the tip of the burette is exactly above the mouth of the conical fl
Q. Explain the types of classification of plants? It is practically impossible for anyone to study all the plants of the world, 'even if one spends whole life. Thus, it is nece
In the eyes light energy is converted to a generator potential in which region
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