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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
The Word 'disaster' is believed to be originating from the French word 'Disastre' which is a combination of two words 'des' meaning bad and 'astre' meaning star. Thus this term ref
Clinical Manifestations Early Symptoms Symptoms are episodic in nature or continuous with very little response to bronchodialators. Productive cough especially on awake
Salmonellosis in poultry A wide variety of serovars are prevalent among chicken, turkeys, ducks and geese. The poultry is an important reservoir of salmonellae. The common dise
How does iodine kill germs? The microbiocidal action of Iodine is because of the active form, I2, which is polarized by water and like all halogens (chlorine, fluorine, bromine
P o lymerase chain reaction (PCR): The PCR technique enables the exponential amplification of nucleic acid sequences from any biological samples. In the last few ye
Organ Systems : Organisms are composed of organ systems. Each organ system is made up of several different organs. For example, the digestive system is composed of several organ
Characteristics of the Five-Kingdom classification At present, as you know, the trend is to follow the five-kingdom classification. However, while accepting the Five-Kingdom C
Diffusion of Gases Gases diffuse from areas of higher partial pressure to areas of lower partial pressure. The diffusion along the partial pressure gradient ceases only when
Cell Determination Cell determination is a process through which portions of embryonic genome are selected for expression in particular embryonic cells. Determination to follo
Is transpiration the only way through which leaves lose water? Plants do not only lose water as vapor, as by transpiration. The leaves also lose liquid water by a phenomenon c
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