Textbook Question
How do the components and structure of cell membranes relate to the functions of membranes?
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6. The Membrane
Introduction to Membrane Transport
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How do substances move across a selectively permeable membrane?
A
Through facilitated diffusion, which requires ATP
B
Through osmosis, which involves the movement of solutes
C
Through active transport, which requires energy
D
Through passive transport, which requires energy
Verified step by step guidance1
Understand the concept of a selectively permeable membrane: It allows certain substances to pass through while blocking others, based on factors like size, charge, and solubility.
Differentiate between passive and active transport: Passive transport does not require energy and includes processes like diffusion and osmosis, while active transport requires energy, usually in the form of ATP, to move substances against their concentration gradient.
Explore facilitated diffusion: This is a type of passive transport where substances move across the membrane with the help of transport proteins, without the use of energy.
Examine osmosis: Osmosis is the passive movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Identify active transport: Active transport requires energy to move substances across the membrane against their concentration gradient, often involving transport proteins and ATP.
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