There may be no true definition on what life is but it can be described through the following properties. Regulation of the internal environment to maintain a constant state; for example, electrolyte concentration or sweating to reduce temperature (Homeostasis),Being structurally composed of one or more cells, which are the basic units of life(Organization),Transformation of energy by converting chemicals and energy into cellular components and decomposing organic matter. Living things require energy to maintain internal organization and to produce the other phenomena associated with life (Metabolism), Maintenance of a higher rate of anabolism than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter (Growth), the ability to change over a period of time in response to the environment. This ability is fundamental to the process of evolution and is determined by the organism's heredity as well as the composition of metabolized substances, and external factors present. (Adaptation), A response can take many forms, from the contraction of a unicellular organism to external chemicals, to complex reactions involving all the senses of multicellular organisms. A response is often expressed by motion, for example, the leaves of a plant turning toward the sun and by chemo taxis(Response to stimuli),The ability to produce new individual organisms, either asexually from a single parent organism, or sexually from two parent organisms.( Reproduction).
Based on the properties shared by all organisms the universal ancestor can illustrated with the following defining features.
A genetic code based on DNA.
DNA composed of four nucleotides (deoxyadenosine, deoxycytidine, deoxythymidine and deoxyguanosine), to the exclusion of other possible deoxynucleotides.
A genetic code composed of three-nucleotide codons, thus producing 64 different codons. Since only 20 amino acids are used,... [continues]
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