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There is no store for nitrogen-having compounds as there is for carbohydrate (glycogen) or lipids (triacylglycerol). Thus nitrogen ingested in excess of what is required through the organism has to be excreted. The excess nitrogen is first transformed into ammonia and is then excreted from living organisms in one of three ways. Various aquatic animals simply excrete the ammonia itself straightly into the surrounding water. The Birds and terrestrial reptiles excrete the ammonia in the form of uric acid, though most terrestrial vertebrates convert the ammonia into urea before excretion. These three classes of organisms are called as: ureotelic, ammonotelic and uricotelic, respectively.
Concerning their permeability how are membranes classified? Membranes can be divided as impermeable, permeable, semipermeable or selectively permeable. An impermeable membra
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
explain the genotypes for each blood type and how this is an example of codominance. Blood type- A, AB, B, 0
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Ratios of the bases in different samples of nucleic acid yielded the following results: a. A + C = 0.6 b. A + C = 1 c. A + G = 1.2
The rRNA transcription units in E. coli hold some tRNA genes which are processed and transcribed at the time of rRNA transcription. The other tRNA genes happen in clusters of
What would be the approximate number of amino acids of a protein with a mass of 203 kd? Assume an average molecular weight for amino acids of 110 grams/mol.
Q. What are persistent organic pollutants (POPs)? The POPs, or persistent organic pollutants, are toxic substances formed from organic compounds. The POPs are made in several i
What is capillarity? How this phenomenon is chemically explained? What is the relevance of capillarity for water transport in plants? Capillarity is the phenomenon by which
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