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MCQ on why lysosomes don't digest themselves

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MCQ on why lysosomes don't digest themselves

Postby fantic » Tue Nov 15, 2011 6:15 am

Lysosomes contain very powerful digestive enzymes that can break down proteins, carbohydrates and other molecules. Why don't these enzymes digest the cell itself?
(a) The enzymes will only digest foreign material
(b) The enzymes are separated from the cytoplasm by the lysome's membrane
(c) The enzymes are inactive until secreted from the cell

Tried googling but wasn't of any use. Please help! I'm thinking it's either A or C
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Postby JackBean » Tue Nov 15, 2011 6:27 am

and how do you think the enzymes distinguish, whether is the material foreign or home-made?
I though that lysosome enzymes work inside the cell.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: MCQ on why lysosomes don't digest themselves

Postby zombiesagan » Tue Nov 15, 2011 2:59 pm

You might want to look into the pH requirements of lysosome enzymes as well and compare the pH of the lysosome with that of the cytoplasm. Of course, to keep these pH's different, the lysosome is separated from the cytoplasm by a strong membrane, although I'm not sure this is what the question is getting at.
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