In multicellular organisms, cells have receptors for death-signalling molecules - VCE - SSCE Biology - Question 12 - 2013 - Paper 1
Question 12
In multicellular organisms, cells have receptors for death-signalling molecules. These death-signalling molecules play a role in apoptosis.
The death-signalling mol... show full transcript
Worked Solution & Example Answer:In multicellular organisms, cells have receptors for death-signalling molecules - VCE - SSCE Biology - Question 12 - 2013 - Paper 1
Step 1
A. allow for tumour formation.
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Answer
Death-signalling molecules are not involved in tumour formation; in fact, they help regulate cell death, preventing uncontrolled cell proliferation.
Step 2
B. act by decreasing the rate of mitosis.
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Answer
While these molecules can influence cell growth, their primary role is not to decrease mitosis, but to trigger apoptosis when necessary.
Step 3
C. initiate a response causing a cell to swell and burst.
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This description is more related to necrosis rather than apoptosis. Death-signalling molecules trigger a controlled process that leads to cell death, not simply swelling and bursting.
Step 4
D. result in destruction of cells that are no longer required.
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Answer
Correct. Death-signalling molecules indeed facilitate the destruction of unneeded cells through apoptosis, maintaining homeostasis in the organism.
