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The vacuole is prominent and present at the center of the cell, surrounded by cytoplasm. Firm, small onions are best for microscopy. The epidermal layers are removed by cutting the onion and peeling them off (they are the membrane-like sheaths between each onion layer).
[1] [2] Vacuoles are essentially enclosed compartments which are filled with water containing inorganic and organic molecules including enzymes in solution, though in certain cases they may contain solids which have been engulfed. Vacuoles are formed by the fusion of multiple membrane vesicles and are effectively just larger forms of these. [3]
Gas vesicles, also known as gas vacuoles, are nanocompartments in certain prokaryotic organisms, which help in buoyancy. [1] Gas vesicles are composed entirely of protein ; no lipids or carbohydrates have been detected.
Diagram of an animal cell with only the vacuole labelled: Date: 15 April 2009: Source: File:Biological_cell.svg: Author: MesserWoland and Szczepan1990 modified by smartse: Permission (Reusing this file) Own work, copyleft: Multi-license with GFDL and Creative Commons CC-BY-SA-2.5 and older versions (2.0 and 1.0) Other versions: File:Biological ...
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The epidermis is the main component of the dermal tissue system of leaves (diagrammed below), and also stems, roots, flowers, fruits, and seeds; it is usually transparent (epidermal cells have fewer chloroplasts or lack them completely, except for the guard cells.) The cells of the epidermis are structurally and functionally variable.
In detail, a phagocyte's duty is obtaining food particles and digesting it in a vacuole. [2] For example, following phagocytosis , the ingested particle (or phagosome) fuses with a lysosome containing hydrolytic enzymes to form a phagolysosome ; the pathogens or food particles within the phagosome are then digested by the lysosome's enzymes.
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