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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.
A renewable exhaustible natural resource is: 1. Coal 2. Petroleum 3. Minerals 4. Forest Forest is a renewable exhaustible natural resource
Determine the uses of Electrical Recording - Brain function We can also learn about brain function by recording its electrical activity. In electroencephalography (EEG) and the
A solution was prepared by dissolving 25g NaOH powder in 100 ml water. Using not more than 15 ml water, devise a series of dilutions that will give a concentration of 5mg/ml NaOH.
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Q. What is Secretary diarrhoea? Secretary diarrhoea: It is a result of active secretion OF electrolytes and water by the intestinal epithelium caused by bacterial and viral inf
Define Determinants of Food Security - Vulnerability? It is the fourth critical variable and defines the risk factor to which a person, family, community or nation is exposed o
Q. Concerning their permeability how are membranes classified? Membranes can be classified as permeable, impermeable, selectively permeable or semipermeable. An impermeable
Determine which of the following observations (A-J) could lead to a testable hypothesis. For those that are testable: Write a hypothesis and null hypothesis What would be your expe
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what is the biological significance of skeleton
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