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VCE Biology Question Thread
DJA:
Thank you so much! Doing AOS 1 study atm and just consolidating the holes in my knowledge when I can't find the answers elsewhere. Cheers!
Question 1: Do lysosomes die in the process whereby they digest unwanted cell parts/damaged molecules/foreign molecules? (In essence, by digestion, do they self-destruct in the process or are they 're-usable' and can perform their processes multiple times?)
Question 2: Should we know the function of Peroxisomes and Endosomes for the VCE course?
Yacoubb:
--- Quote from: DJALogical on December 26, 2013, 04:35:02 pm ---Thank you so much! Doing AOS 1 study atm and just consolidating the holes in my knowledge when I can't find the answers elsewhere. Cheers!
Question 1: Do lysosomes die in the process whereby they digest unwanted cell parts/damaged molecules/foreign molecules? (In essence, by digestion, do they self-destruct in the process or are they 're-usable' and can perform their processes multiple times?)
Question 2: Should we know the function of Peroxisomes and Endosomes for the VCE course?
--- End quote ---
(1.) Lysosomes are basically membrane-bound sacs that contain digestive enzymes called lysosymes. These lysozymes are secreted, the lysozymes break down the matter taken up by the cell, and the lysozyme, an enzyme, is neither used up nor consumed by this catabolic reaction. So essentially, no, the lysosomes are not destroyed in this instant.
2. You don't need to know much. I'd just remember that catalase, the enzyme that catalyses the breakdown of hydrogen peroxide, is contained in peroxisomes. Also, endosomes are just vesicles thar transport materials that enter the cell, to lysosomes, to undergo cellular digestion.
Stick:
--- Quote from: DJALogical on December 26, 2013, 04:35:02 pm ---Thank you so much! Doing AOS 1 study atm and just consolidating the holes in my knowledge when I can't find the answers elsewhere. Cheers!
Question 1: Do lysosomes die in the process whereby they digest unwanted cell parts/damaged molecules/foreign molecules? (In essence, by digestion, do they self-destruct in the process or are they 're-usable' and can perform their processes multiple times?)
Question 2: Should we know the function of Peroxisomes and Endosomes for the VCE course?
--- End quote ---
Just making a big point of this. Do not say that non-living material (e.g. enzymes) die. This is a one way trip to getting zero marks for a short answer question, even if the other parts of your response are correct.
DJA:
--- Quote from: Stick on December 26, 2013, 05:12:34 pm ---Just making a big point of this. Do not say that non-living material (e.g. enzymes) die. This is a one way trip to getting zero marks for a short answer question, even if the other parts of your response are correct.
--- End quote ---
Got it. Thanks for the heads up.
Are there any cells in the body that 'self-destruct' in order to consume/breakdown foreign material/invading antigens? (I'm thinking of phagocytes and lymphocytes here but I am really NOT sure.
If there are, would it be correct to say that these kinds of cells die in the process as these cells are living?
alondouek:
--- Quote from: DJALogical on December 26, 2013, 05:35:26 pm ---Got it. Thanks for the heads up.
Are there any cells in the body that 'self-destruct' in order to consume/breakdown foreign material/invading antigens? (I'm thinking of phagocytes and lymphocytes here but I am really NOT sure.
If there are, would it be correct to say that these kinds of cells die in the process as these cells are living?
--- End quote ---
I'm not aware of any cells that specifically self-destruct to destroy foreign bodies, but all cells will trigger apoptosis as a mode of damage control. As these are regular cells, they definitely are living!
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