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Pre-Embryonic Development
We had said in the starting of the unit that prenatal development can be divided into two phases, embryonic and foetal. The embryonic phase of development is stated to really start from the second week after fertilization; and then lasts up to 8 weeks of the 1st trimester. In this section we describe the pre-embryo stage starting along with the events that take place at fertilization and after that proceed to explain the development of the pre-embryo up to two weeks of development.
Giant Nerve Fibres We now know that giant nerve fibres take place in the central nervous system of many polychaetes, oligochaetes, insects cephalopod etc. They are broader an
Define Planning for nutritional need For Adults? The term 'adult' refers to any individual in the age group of twenty years and above. The period beginning from twenty years an
In which type of animals does the placenta exist? What is its main function? True placenta is present in placental mammals. The placenta is produced from the chorion of the
Each of the three eukaryotic RNA polymerases has more subunits or 12 and so these are big complex enzymes. The genes encoding some of the subunits of each eukaryotic enzyme show
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The enzyme in the TCA cycle that catalyzes a substrate level phosphorylation is -citrate dehydrogenase -succinate thiokinase -isocitrate dehydrogenase
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What is the energy source used in active transport through biological membranes? The energy essential for active transport (against the concentration gradient of the transporte
Q. Describe ST Segment Depression? The development of ST-segment depression with exercise is probably the most reliable sign if myocardial ischaemia and appears to be the most
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