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Endocytosis and ExocytosisEndocytosis is the process by which substances are brought into the cell from outside by formation of membrane bound vesicles. These extra cellular substances are enclosed in a small portion of plasma membrane which invaginates and pinches off to form an intracellular vesicle. The intake of fluids by.formation of vesicles is called as pinocytosis (pinein = drink). Pinocytosis is induced by the presence of appropriate concentrations of inducer molecules which can be proteins, amino acids or certain ions in the medium surrounding the cell. The ingestion of large particles by formation of larger vesicles is known as phagocytosis (phagein = to eat). The process of phagocytosis is associated with heterophagic activity of the lysosomes such as the destruction of worn blobd cells in the liver, spleen and bone marrow. Exocytosis is the reverse sequence where the membrahous intracellular vessicle fuses with plasma membrane and releases its content to the extracellular surroundings. The best understood form of , exocytosis is secretion by the cell. As you have studied earlier, Golgi apparatus plays an important role in the formation of cytoplasmic intracellular vesicles. The membrane of these vesicles is incorporated into plasma membrane and the vesicle's contents are discharged to the exterior.
Temperature and Concentration of Nutrients Temperature Temperature like salinity remains almost constant in the oceans in contrast to the land or terrestrial ecosystems
A codon comprise three nucleotides. There are four possible nucleotides, each of which has an equal probability of being in any one of three spots. How many possible codons exist?
Phylum Ascomycetes 1) Sexual reproduction is by conjugation and is followed by the formation of ascospores inside a sac called ascus. 2) The asci may be grouped together to
Emerging and New Generation By-Products Oil palm by-products are good examples of NCFR which are becoming increasingly important new feeds. This is associated with the rapidly
Explain Atazanavir Atazanavir (ATV, Reyataz) - Atazanavir (Medical Letter 2003; 45:89) is the first single-agent protease inhibitor with once-daily dosing. In clinical trials
Evolutionary changes that occurred in humans are - Development of prominent chin. Increase in cranial capacity. Reduction of brow-ridges. Development of speech. Developme
Explain Ground Meristem in Primary Root Growth? To review, the protoderm is the primary tissue that eventually forms the outside layer that covers the root and shoot and leaves
what is virus
Define indicators of Mg status - Total Serum Mg? Several indicators of Mg status have been described. i) Total Serum Mg: Serum Mg concentration are routinely measured to ass
Q. Can you define termination of the stress Test? Test should be terminated when: 1) PVCS develop in pairs or with increasing frequency or when ventricular tachycardia devel
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