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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.
Besides the liver which is the other adnexal gland of the digestive system that releases substances in the duodenum participating in extracellular digestion? The other adnexal
What is the constitution of the cartilaginous matrix? The cartilaginous matrix is made of collagen fibers, mostly collagen type II, and of proteoglycans, proteins associated to
In lab rats, hair color and texture are controlled by two genes, the A gene for color and the B gene for texture. in both of these genes, the alleles show no dominance to each othe
Explain the Modern Trends in Animal Taxonomy? Earlier you learnt how taxonomy is interrelated to other biological fields. You also learnt how information is used from other f
Match each of the methods or vectors below to an appropriate form of gene therapy, assigning two methods or vectors to each form. Use each method or vector only once. Methods/vec
Q. Symptoms of oesophagitis? The symptoms of oesophagitis include heartburn or pyrosis, iron-deficiency anaemia due to chronic tissue bleeding, aspiration, which may cause coug
Define Abbe Condenser of Microscope? It is present beneath the stage, as shown in Figure. It collects and focuses a cone of light on the slide. Its position can be adjusted ver
Ribavirin (Copegus, Rebetol, and others) Combination treatment of HCV with peginterferon alfa and oral ribavirin has produced higher sustained response rates than peginterfero
MICROORGANISMS : Great care must be taken in microbiological experiments, particularly with pathogenic (disease producing) organisms. Many microorganisms which are normally harmle
Sporophytic and Gametophytic Self-Incompatibility Besides the categories based on morphology, self incompatibility can be further classified into sporophytic or gametophytic t
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