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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.
Vitellogenesis Vitellogenesis is the stage where much of the oocyte growth occurs. The completion of second maturation division (meiosis), which may occur after ovulation, res
Q. What are the three fundamental sexual life cycles studied in Biology? Which of them corresponds to metagenesis? Which of them is the human life cycle? Sexual reproduction ma
HARD Y - WEINBERG LAW - Proposed by G.H. Hardy and W. Weinberg in 1908 independently. The law states "the frequency of genes or alleles in a population remains constant
Why is the dietary obtainment of iodine so important for thyroid functioning? The obtainment of iodine from the diet is significant for the thyroid because this chemical elemen
What is the Classification of Burns? Burns can be classified on the basis of the extent, depth, patient age and associated illness or injury. On the basis of depth, burns are u
The Features of Retrograde Peri-Implantitis include: - Periapical Bone loss without gingival inflammation. - Microflora consisting mainly of streptococci and nonmotile organ
What is the typical feature of the epithelia? How different is it from the connective tissue? The typical feature of the epithelium is the absence or almost absence of space a
Nuclear endosperm in angiosperm.
Define about the Paracellular Route - Calcium? It involves passive Ca transport through the tight junctions between mucosal cells. The salient features include: It is in
STRUCTUR E OF SPERMATOZOAN Structure of sperm is divided into 3 parts - (1) Head (2) Middle piece (3) Tail 1 . HEAD
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