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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.
Importance of ecology
a sea urchin egg is injected with an mRNA encoding the cadherin protein fragment described above and an mRNA encoding the Pmar1 transcription factor. The embryo is allowed to devel
Kinds of Hermaphroditism Depending upon the timing of maturity of the gonads, hermaphroditism can be of two types 1. Simultaneous hermaphroditism . Both male and female g
Define interaction of folate with vitamin B 12 ? Vitamin B 12 : For the conversion of folic acid to folinic acid, vitamin B 12 is required. Vitamin BIZ deficiency caus
Explain some Precautions for Preparation of Chloride Buffers? 1. Glass electrodes should always be before and after measuring pH with a tissue paper. 2. The pipettes should
Family Centred Activities to Ensure Harmonious Relationship: Between various members of the family attitudes of mutual trust, love and respect for one another need to be fo
mode of respiration in difrent animals
Production of haploids by tissue culture,
cherector and economic imoprtance of fungi snd algae
Conjugation – Protozoan Conjugation is characteristic of ciliates. The details vary from species to species. The general features can be observed in Paramecium sps. which has
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