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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.
Q. What is population density? The Population density is the relation between the number of individuals of a population and the area or volume they occupy. For instance, in 200
give the theory of spermatogenesis
What are the main negative ions found in living beings? The major anions found in living beings are the chlorine anion (Cl-), the phosphate anion (PO4--), the bicarbonate anion
Prior to the solving of the structure of DNA, Erwin Chargaff calculated the amounts of the four nucleotides (A, T,G,C) and made which of the following conclusions? A. All four
What is a population? The population is a set of individuals of the same species found in a given place in a given time.
Q. Describe the rationale behind sterilization? Rationale for sterilization: Source of potential infection that exists in dental office include hands, saliva, nasal secretion,
Phylum Tracheophyta Tracheophytes mean vascular plants. Tracheophyta includes ferns, the gymnosperms and the flowering plants. They have appeared some 400 million years ago, an
Q In which environments bacteria live? Bacteria can be found in a variety of environments throughout the planet. There are bacteria in the air, on the surface, in fresh water,
The concentration of the tissue fluid, which bathes all cells in the body, is kept more or less constant. Why is this important? If the tissue fluid became more dilute, the ce
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