Multiple Choice
Which of the following does not accurately describe a channel or a carrier?
6. The Membrane
Simple and Facilitated Diffusion
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Which of the following statements about diffusion is true?
A
It involves only the movement of water molecules.
B
It requires expenditure of energy by the cell.
C
It occurs when molecules move from a region of lower concentration to a region of higher concentration.
D
It always requires integral proteins of the cell membrane.
E
It is a passive process.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Recognize that diffusion is a passive process: This means it does not require energy expenditure by the cell. Molecules move naturally due to kinetic energy.
Identify the types of molecules involved: Diffusion can involve various types of molecules, not just water. Water movement specifically is called osmosis.
Clarify the role of cell membrane proteins: While some molecules require integral proteins to facilitate their movement across the cell membrane (facilitated diffusion), diffusion itself does not always require these proteins.
Evaluate the given statements: Compare each statement with the characteristics of diffusion. The statement 'It is a passive process' aligns with the definition of diffusion as it does not require energy.
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