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cells

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cells

Postby MIA6 » Tue Oct 31, 2006 4:30 am

1. Can anyone tell me what is the difference between 'organelles' and 'protoplasm'? I feel they are very similar.
2. What's the difference of the functions of the 'cell wall' and 'cell membrane'? I think they are both controlling the transport throughout the cells?
3. Is the 'living cell' same as 'cell'? I read my book, it says: The living cell is a chemical factory which uses the same elements that are found in the nonliving environment. I don't really understand what it means. Hope you can explain to me. thanks a lot!
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Postby sachin » Tue Oct 31, 2006 6:15 am

Cell is samllest functional, structural & phisiological unit of living organism. It utilizes non living substances such as amini acids, carbohydrates, protiens, minerals,oxigen, CO2 for its daily processes as raw material.

Cell has membrane and wall. cell wall is absent in animals. Both functions for transport of ions & osmosis, Protection etc..cell membrane is formed of lipid bi layer. cell wall is poly saccharide.

cell organells all together with internal matrix form protoplasm.
cell organells + nucleus + matrix = cytoplasm
protoplasm+(nucleoplasm+nuclear membane)+matrix= cytoplasm
cytoplasm+cellmembrane+cellwall=cell.
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Postby baikuza » Tue Oct 31, 2006 10:38 am

addition

organell=organ cell

so, organell can be said the "organ" of a cell..
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Postby Dr.Stein » Wed Nov 01, 2006 3:47 am

1. Protoplasm = parts of cells which make cells alive, protoplasm is not available when cells dead. Organells are cell's machinery to support the process to make cells alive.

2. Cell wall functions to line the cell and give it a shape. Cell membrane is a "filter" for transportation in and out of the cell. Think about a building with solid wall vs a building with wall+trellis ;)

3. Literally, it is differeent. But it could be the same depends on the context.
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Postby baikuza » Wed Nov 01, 2006 11:39 am

ah.. again the addition

cell wall ussually can be found on bacteria.
they act as the protector from the dehidration and other unwanted enzyme etc that can damage the cell of the bacteria and support the shape. ah... some are excrete mucus and because of its hard "wall" (mucus+cell wall) they can be said gram posifive.
want to know more?, then try wekipedia... i think they have some articles about it.


like Dr. Stein said, some how it is the same....
but, literally cell = box, and can differ into living cell and dead cell.
living cell isn't the same as dead cell.
just said in the dead cell, metabolism cannot be found. but not in living cell.
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Postby Dr.Stein » Thu Nov 02, 2006 2:11 am

baikuza wrote:ah.. again the addition

cell wall ussually can be found on bacteria.

...and plant cells too :wink:
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Postby baikuza » Thu Nov 02, 2006 1:20 pm

ah..
yes. absolutely can be found on plant too.
thanks
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