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Events prior to the Sperm-Egg Fusion
In a number of organisms that have been studied, the sperm remain immotile in the testis or in the semen. The sperm become active and motile when they are close to the eggs. Several factors have been attributed for the activation of the sperm which include pH, oxygen tension, presence of certain ions etc. Detailed studies in sea urchin have shown a change in the pH as the cause for the activation of the sperm. In mammals the definite cause of activation is not known and it is presumed that sperm motility begins with the ejaculation of the semen into the female reproductive tract. Activation of the sperm does not ensure that the sperm will meet the egg. In instances where fertilization occurs outside the organism, i.e. external fertilization, chemotactic mechanisms have been evolved to attract the sperm towards the egg. In fish eggs substances found near the micropyle attract the sperm. The substances found near the micropyle make the sperm to move rapidly to the vicinity of the egg.
Why are the plants having single-seeded fruits and plants having fruits with surplus one seed? The Plants that produce single-seeded fruits, for instance, avocado and mango oft
Em u l sio n preparation Frozen deboned meat, fat and by-products are tempered at 0° to 4° C for 12to 15 hr and cut into pieces and coarse minced by passing through 8, 10 o
DIFFERENCE S BETWEEN MYOSIN AND ACTIN FILAMENTS Myosin filaments (primary filaments) Actinfilament s (secondary filaments)
Q. Mechanical means of instrument cleaning? Using mechanical means of instrument cleaning rather than hand scrubbing should minimize handling of instruments. If procedures are
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Define the Process of Digestion of Proteins? The daily protein intake (of about 50-100 g) and the protein of enzymes, sloughed (bled or drop off) epithelial cells and mucins, w
Explain the Indole Production Test? Many microorganisms produce an enzyme tryptophanase which oxidizes amino acid tryptophan to produce pyruvic acid, indole and ammonia. We can
Insulin promotes muscle glucose uptake and metabolism. In presence of insulin muscle cells take up glucose and use it as a source of energy. Insulin also promotes storage of insuli
Three point charges are located at the corners of an equilateral triangle. Find the magnitude and direction of the net electric force on the 1.60 uC charge. (Let A = 1.60 uC, B= 6.
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