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Procaryotic Structure and Diversity
The first organisms which did not have well defined nucleus, called procaryotes, (pro = earlier, caryon = nucleus) were probably anaerobic and heterotrophic. It is believed that at that time there was no free oxygen available in the atmosphere, and the autotrophs had a complex metabolism to prepare their own food. You can observe the difference between autotrophism and heterotrophism in Figure shown below.
We will now discuss different types of procaryotes and their evolutionary relationship to draw an outline of orgahic evolution.The 'group of procaryotes' is known as Monera. This group includes eubacteria, archaebacteria, green bacteria, purple bacteria, virus, prochlorophyta, cyanophyta and mycoplasma. Here we will describe the structure of two procaryotes viz. bacteria and virus.
The phases of the cardiac cycle are: 1) Atrial Systole This begins with the P-wave of the ECG. The atrio-ventricular valves are open and the ventricles are relaxed (diastole
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where does the free nucleotides present in the nucleus come from
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The man-made sources of air pollution are broadly categorized into three: Point or stationary sources: it includes such sources which pollute at particular. Pollutants from
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