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Endoplasm and Ectoplasm
Under the light microscope, we can find two regions in the-cytoplasm .of the amoeba;
In the phase contrast microscope, we can see that the endoplasm contains abundant particles and membranous organellae, found in constant random motion, indicating their freedom of movement in the sol region of the cytoplasm. Ectoplasm contains a three-dimensional network of cross-linked actin fibres, and all other organelle are excluded from the region. This gel region apparently decides the shape of the pseudopodium and may transmit tension from the regions of cellular contraction to the sites of contact with the substratum. It is believed that the ectoplasm contains non-cross-linked actin filaments and probably myosin filaments also.
As a pseudopodium elongates and the sol-like endoplasm streams into it, the region of the endoplasm near the tip of the pseudopodium apparently transforms into - gel-like ectoplasm. Simultaneously, the ectoplasm elsewhere in the cell transforms into sol-like endoplasm, probably by an uncrossing of linking actin fibres. Proteins such as actin, fimbrin and fodrin are involved in the sol-to-gel transition. They cross-link actin filaments and bundle them to each other. Cross linking of actin filaments produces a network confining the movement of individual actin molecules and results in the semisolid gel state.
Kinds of Succession - Ecology The ecological succession can be broadly classified into two kinds, on the basis of the nature of the habitat. Figure: Kinds of Success
Explain Weight Gain during Pregnancy and Foetal Outcome? Weight gain and birth weight are indisputably related to each other. Several studies have shown a higher occurrence of
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Action potentials include changes in the membrane potential of an axon, as shown in the schematic below. During the refractory period, sodium channels are inactivated and
Q. What are the major biological functions of the polysaccharides? Polysaccharides have a structural function and an energy storage function. Polysaccharides incorporated by li
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Some of the characteristics of Bt cotton are: 1. Long fibre and resistance to aphids 2. Medium yield, long fibre and resistance to beetle pests 3. High yield and produ
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