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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.
Explain the Basic Concept of Proteins? Proteins, as we already knows by now are products of amino acids. Each molecule of protein is composed of many molecules of amino acids j
Define Requirements of Protein during Surgery? Negative nitrogen balance is the most common nutritional deficiency related to surgery. Reserves of protein in the tissues and pl
Phases of Ovarian Cycle In non-mammalian vertebrates the ovarian cycle consists of the following phase; Pre breeding phase Breeding phase and Post breedin
Q. Give the biological effects of aflatoxin and List the various natural toxins present in food? Biological effects of aflatoxin include hepatotoxicosis, carcinogenesis and liv
According to cellular organization how are living beings divided into two groups? Cellular beings are separated into two groups: the prokaryotes, unicellular beings whose sole
Implant Mobility and Discomfort Implant mobility is an indication of the lack of osseointegration. Even if periimplant disease has progressed relatively far, implants may still
Applications : The first operation conducted was ligation of a patent ductus arteriosus through a left thoracotomy. Same approach is used for repair of coarctation of the aorta,
Cardiac Tamponade Suspect cardiac tamponade if there is a sudden cessation of chest drainage during immediate post-operative period. The blood is getting collected i
(a) Explain the structure of a human sperm. (b) Give a schematic representation showing the events of Spermatogeninesis in human male.
A plant with red flowers is crossed with a white-flowered plant of the similar species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower colour
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