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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. What is the functional unity of the kidneys? The functional (filtering) unity of the kidneys is the nephron a nephron is made of efferent arteriole, afferent arteriole, glom
Magnesium - It is available in most of the plants, especially vegetables. By its deficiency diarrhoea is caused. Its important functions are - (a) Along with c
Q. Basic working of Midbrain? Midbrain: Also known as the mesencephalon, this part is located behind the frontal lobes and in the center of the entire brain. It deals with func
Define Factors Which May Lead To Errors in Count? There are many factors, which may lead to errors in count. (i) Counts may be low if the agar medium used in the technique d
Which bone forms the non-moving muscle attachment in (a) the hip joint, (b) the shoulder joint, (c) the ankle joint? (a) The pelvic girdle gives the non
Which of the below is usually referred to as "master gland" because it regulates so many body activities? Is it: a) Pituitary gland b) Thyroid gland c) Adrenal gland d
Effect of Environmental Factors some lower organisms, though the genetic determiners of the sexes are present, the ambient environment plays a decisive role in the development
Evaluation of production diseases Generally, production diseases are acute states and respond dramatically to administration of a deficient nutrient or metabolite. The nutriti
type study of polystomella
What are secondary roots? In origin how secondary roots differentiate from shoots? Secondary roots are ramifications of the primary (major) root. The secondary roots emerge fro
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