Facilitated diffusion
A - VCE - SSCE Biology - Question 11 - 2013 - Paper 1
Question 11
Facilitated diffusion
A. requires a cell to expend energy:
B. requires the presence of a membrane protein.
C. moves molecules against their concentration gradient.
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Worked Solution & Example Answer:Facilitated diffusion
A - VCE - SSCE Biology - Question 11 - 2013 - Paper 1
Step 1
A. requires a cell to expend energy:
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Answer
Facilitated diffusion does not require the cell to expend energy; it is a passive transport mechanism.
Step 2
B. requires the presence of a membrane protein.
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Answer
This statement is true. Facilitated diffusion specifically requires membrane proteins to assist the transport of molecules across the cell membrane.
Step 3
C. moves molecules against their concentration gradient.
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Answer
This statement is false. Facilitated diffusion moves molecules down their concentration gradient, not against it.
Step 4
D. is the movement of lipid-soluble molecules across a cell membrane.
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Answer
This statement is incorrect. Facilitated diffusion primarily helps in the movement of polar or charged molecules, while lipid-soluble molecules typically pass through the membrane via simple diffusion.
