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How is the yolk sac formed? What is the function of the yolk sac?
The yolk sac is formed from the covering of the vitellus by some cells originated from the primitive gut.
The yolk sac stores vitellus, the main nourishment source of non-placental embryos.
Image Diversity: yolk sac
Simple diffusion Only comparatively small uncharged or hydrophobic molecules (H2O, O2, and CO2, other gases, urea and ethanol) cross the lipid bilayer through simple
Enzyme Proteins that act as catalysts, speeding the rate at which biochemical reactions proceed but not altering the direction or nature of the reactions.
The North Island saddleback or tieke, Philesturnus rufusater, is an endemic New Zealand bird. Saddlebacks inhabit the middle or lower layers of the forest, and eat small invertebra
Q. What is the hormone secreted by the growing ovarian follicles? What is the action of that hormone upon the uterus? The follicles that are growing after menses secrete estrog
Binding site is the place on cellular DNA to which a protein (like transcription factor) can bind. Typically, binding sites may be found in the vicinity of genes, and would be inv
Inorganic Substances - Abiotic Components There are about forty elements that are required in various processes of living organisms. Some of these are macronutrients which the
Staphylococcal food poisoning results from consumption of food containing enterotoxin produced by enterotoxigenic strains of Staphylococcus aureus. It is caused by ingestion of imp
The cell membrane is a slim semi-permeable membrane which surroundings the cytoplasm of a cell. Membrane function is to defend the integrity of the interior of the cell by allowing
How are grasslands classified? The Grasslands may be classified into steppes and savannahs. In a steppe prevailing vegetation is grass, as in the pampas of South America and in
what are the disadvantages of protozoa
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