Activator molecules that are present in cells can turn genes on - VCE - SSCE Biology - Question 14 - 2012 - Paper 1
Question 14
Activator molecules that are present in cells can turn genes on.
Only liver cells produce the protein albumin and only lens cells produce the protein crystallin.
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Worked Solution & Example Answer:Activator molecules that are present in cells can turn genes on - VCE - SSCE Biology - Question 14 - 2012 - Paper 1
Step 1
A. lens cells containing activator molecules for the gene coding for crystallin.
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Answer
This statement is correct. Lens cells must contain specific activator molecules that promote the expression of the gene coding for crystallin, which is essential for lens cell function and transparency.
Step 2
B. the presence of RNA polymerase in lens cells but not in liver cells.
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Answer
This statement is incorrect. While RNA polymerase is necessary for transcription, the presence of this enzyme does not solely explain the difference in protein production between the two cell types.
Step 3
C. liver cells not having the gene that codes for crystallin.
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Answer
This statement is misleading. While liver cells may not actively produce crystallin, claiming they do not have the gene oversimplifies the regulation and expression of genes in different cell types.
Step 4
D. both cells containing identical activator molecules.
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Answer
This statement is incorrect. Lens cells and liver cells have different activator molecules that lead to the specific gene expressions for their respective proteins.
