MCQ on why lysosomes don't digest themselves

Discussion of all aspects of cellular structure, physiology and communication.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
Posts: 3
Joined: Tue Nov 15, 2011 6:11 am

MCQ on why lysosomes don't digest themselves

Post by 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

User avatar
Inland Taipan
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Post by 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.

Cis or trans? That's what matters.

User avatar
Posts: 21
Joined: Thu Nov 10, 2011 5:33 pm
Location: Indiana University

Re: MCQ on why lysosomes don't digest themselves

Post by 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.
"Somewhere, something incredible is waiting to be known." -Carl Sagan

Post Reply

Who is online

Users browsing this forum: Google Adsense [Bot], jacksleeve and 8 guests