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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.
Stress - Responses of Plants to Stress Let us recall what happens within the natural communities occupying the same habitat. The relative location of two plants may place them
Q. Do squids and octopus have exoskeleton? Squids and Octopus generally do not produce external shell (some squid species can have an internal shell). One cephalopod group the
How has the position of the stomata changed in some plants to prevent excessive water loss by transpiration? In some plants that have leaves that be given too much sunlight the
What are the main degenerative diseases of the heart? The major degenerative diseases of the heart are heart failure, arrhythmias, valvular heart diseases, coronary insufficie
Define the term - Stimulus Stimulus and response characteristics of the tests themselves, as well as of the test instructions, become exceedingly important considerations. In g
How long do flowers usually last? Some flowers, like Bachelors Buttons, Zinnias, Marigolds, and Petunias last pretty much from the time they begin blooming until frost. Others,
difference between protonephridia and metanephridia
Illustrate metabolic processes of vitamin B In the human and animal metabolism, they form a functional unit, since, as components of the various coenzymes, they are essential
Abortions Abortion in dairy cattle is commonly defined as a loss of the foetus between the age of 42 days and approximately 260 days (buffaloes 300 days). It is important to d
Define Emerging trends in the nutritional content of technologically? Increased concern about the nutritional content of technologically derived, advanced foods is expressed by
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