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Which type of cell came first in evolution the eukaryotic cell or the prokaryotic cell?
Ans) This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the more easy cell, the prokaryotic cell, appeared early in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for example, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
Briefly explain about the Flexed-arm Hang Test? Persons who cannot do one pull-up may do the flexed-arm hang. Using the same hand position as in pull-ups, subject takes flexed-
Define Regulation of Water Balance - Hormonal Control of Fluid Balance? Hormonal control of fluid balance: When water intake is insufficient or water loss is excessive, the kid
what are enzymes
mitosis define
Illustrate about the Ward Halstead and Luria The linear approach is best exemplified in the work of A.R. Luria and various collaborators, while the configurational approach is
Endothecium - Anther Wall Layers The layer of cells lying immediately next to the epidermis is the endothecium, which is responsible for the dehiscence of the anther. It is us
Determine the extracellular concentration of TVA Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectivel
SODIUM The element is available in table salt. A proper balance of sodium and potassium is essential. Its absorption is under control of aldasterone. The various f
A protein is normally found completely within the inside of a lipid bilayer. The protein likely has: a) Mostly hydrophobic side chains, pointed outwards, with the peptide backbo
Define species according to the biological species concept. What two problems often make this definition impractical?
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