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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.
What is meant by suction force of the plant cell? Does the suction force facilitate or make difficult the entrance of water in the cell? Ans) The suction force (SF) is the osmot
Minerals :- Potassium Food Source Fruits, vegetables, meats Nutritional Functional role Essential nutrient: Deficiency is rare. Salt substitute: KCl may be
SPLEEN Largest lymph gland, also with myeloid tissue is an important specialized reticuloendothelial organ in vertebrates, as the site of erythropoiesis. Splenic tissue i
Which is plant tissue responsible for the filling of the space between other tissues? Plant-filling tissue is basically called as parenchyma and the plant parenchyma can be div
Vitamin C (Ascorbic acid) Vitamin C, ascorbic acid is also called anti-scorbutic vitamin. Ascorbic acid occurs as white crystals or white crystalline powder without odour and o
ISOZYMES Sometimes an enzyme present in the same organism is found to have different molecular forms but catalyzing the same reaction. These are called isozymes. Th
What are plankton, nekton and benthos? Plankton, nekton and benthos are the three groups into which aquatic living beings may be separated. The plankton is formed by the alg
Is the effect of genetic drift likely to be the same in pop 1 and pop 2? How are genetic drift and pop size related? When there is strong selection against the homozygous recessive
Cytokinesis It is defined as the division or cleavage of cytoplasmic part of the cells into two daughter cells. It is first indicated during late anaphase by app
Is crossing over important for the diversity of biological evolution? The Sexual reproduction and the recombination of linked genes (crossing over) are, along with mutations, t
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