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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.
The intermediates in the cycle give precursors for various biosynthetic pathways. An instance is as given below: - From citrate synthesis of fatty acids; - Amino acid synth
Digestive Tract Extracellular digestion takes place in a tubular cavity that extends throughout the length of the organism. All animals after flatworms have-a tubular alimenta
Examples of sex-limited traits
Define Freeze Concentration? This process has been known for many years and has been applied commercially to orange juice. However, high processing costs due largely to losses
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Hepaticae (Liverworts) The gametophyte is thalloid body or simple stem and leaves, with aquatic or semi-terrestrial habit. Rhizoids are multiceillular. Some examples : Mar
Explain about the Observation and Classification of Arthropoda? Introduction In the previous unit you have examined the representatives of artliropoda. In this unit, you wi
How is litmus paper and testing for acid, base, and neutral, related to biology?
Explain the Glass Test Tubes - Food Microbiology Sterile glass tubes are used for culturing microorganisms in liquid or solid media. Sterility in tubes is maintained by using c
Q. How in the respiratory chain do electrons from NADH2 and FADH2 passing through cytochromes liberate energy for the ATP synthesis? What is this ATP synthesis called? NADH2and
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