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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.
Corpus Allatum and Juvenile Hormone The corpora allata are rounded glands attached to the posterior side of every corpus cardiacum making a compact body just behind the brain.
What are Sphingolipids? Also there link to cancer caused in cells.
Explain the Cultural Practices of single crop Continuous cultivation of a single crop over years on the same site causes accumulation of a particular group of microbes, which d
Photoperiodism was first characterised in : 1. Tobacco 2. Potato 3. Tomato 4. Cotton Tobacco is the first in whic photoperiodism characterised.
Contagious bovine pleuropneumonia (CBPP) This is a highly fatal disease of cattle and of major economic importance in certain tropical countries. It also affects buffaloes, bis
Explain Procedure for Simple Staining of Bacterial Cultures? Now carry out the exercise following the steps given herewith: (1) Prepare thin bacterial smear on clean glass s
In general compare and contrast the three functional classifications of joints according to movement. What are two characteristics that make synovial joints unique and different fr
Before we proceed to discuss kin selection we should define the term altruism. It refers to the behaviour pattern of an individual in the population for the benefit of other member
Amelioration of mineral deficiency Performance of livestock in the tropics is mainly governed by the quality and quantity of nutrients provided in the diet. In most of the dev
Littoral Zone Plants of the littoral zone Two types of plants occur here: Non-rooted phytoplanktons which include all kinds of algae occurring in the limnetic as wel
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