Assignment and Homework help in Amoeba Structure
Several pseudopodia are formed over the surface of the body known as Polypodial. The type of pseudopodia in amoeba is called lobopodia. Lobopodia are blunt, finger like tubular pseudopodia containing both ectoplasm and endoplasm.
Size and shape: amoeba is a unicellular microscopic animalcule and measures about 250 to 600 microns. In maximum diameter. To the naked eye, the largest amoeba is just visible as a whitish blob. Under the microscope it appears as an irregular, colourless and translucent mass of protoplasm, continually changing its shape by sending out and withdrawing finger-like processes. Called the pseudopodia. When it withdraws all its pseudopodia, it becomes spherical in a shape. Far from being shapeless, amoeba is considered to have a definite polarity, that is it has definite anterior and posterior ends. At the anterior end, the animal puts out pseudopodia, while the posterior end is marked by a wrinkled region, called uroid. Pseudopodia or false feet are finger-like and blunt extensions of the cell body. These are formed as a result of liquification and flowing forward of the cytoplasm. As many pseudopodia are formed simultaneously A. proteus is a polypodial species. The pseudopodia are fairly large and tubular with rounded tips. Such pseudopodia are called lobopodia. They move by pressure flow mechanism and assist the animal in locomotion and food ingestion.
Amoeba posses no cell wall. The body is covered by a very thin, delicate plasma membrane or unit membrane, called the plasmalemma. Inside the plasmalemma, there is a dense mass of cytoplasm containing several organelles.
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