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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.
ARM BONES - Each arm contain 30 bones as : humerus in upper arm, radius ulna in forearm, 8 carples in wrist, 5 metacorples in plam, 14 phalnges in fingers. HUMERU
Evolution of Horse - Credit to Prof. C. Marsh (1879) of Yale University for complete work. S.No Fo ssil/Genus Period
Solar Tracking - Nastic and Epinastic Responses Many plants such as sun flowers are capable of solar tracking in which the flat blade of leaves or inflorescence will remain a
MICROTUBULES Discovered by De Robertis and Franchi . Term given by Slautterback . These are hollow structures, consists of tubulin protein. Each protein diamer
Explain Adverse effects of Atazanavir Atazanavir causes indirect hyperbilirubinemia. It has had no adverse effects on lipid profiles, but the drug's long-term effects are unkn
The first evidence of implants dates back to 600 A.D. in the Mayan population. There are reports that the ancient Egyptians attempted intra-osseous implantation of animal teeth or
Define the Wealth Care Delivery ? The challenge that exists today in many countries is to reach the whole population with adequate health case services and to ensure their util
Erythrocytes or red blood cells: These are otherwise called Red Blood cells or corpuscles. These are the most numerous cells in the blood.There are about 4.5 to 5.5x 10 9
Bi-and Poly-Functional Enzymes These enzymes are generated by genes obtained by fusion of the coding regions of two or more genes encoding various enzymes. In simple words, the
Cold Chain System Vaccines are sensitive to heat. On exposure to heat their potency is lost. Once a vaccine has lost its potency it cannot be regained, so it is important
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