Multiple Choice
Which solute is most likely to cross a membrane by facilitated diffusion?
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6. The Membrane
Passive vs. Active Transport
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Which of the following are types of passive transport across cell membranes?
A
Phagocytosis and pinocytosis
B
Sodium-potassium pump and proton pump
C
Endocytosis and exocytosis
D
Simple diffusion, facilitated diffusion, and osmosis
Verified step by step guidance1
Step 1: Understand the concept of passive transport. Passive transport refers to the movement of substances across cell membranes without the use of energy (ATP). It relies on the concentration gradient, moving substances from areas of high concentration to areas of low concentration.
Step 2: Identify the types of passive transport. The three main types are: simple diffusion, facilitated diffusion, and osmosis. These processes do not require energy and occur naturally due to the concentration gradient.
Step 3: Define simple diffusion. Simple diffusion is the movement of small, nonpolar molecules (e.g., oxygen and carbon dioxide) directly through the lipid bilayer of the cell membrane.
Step 4: Define facilitated diffusion. Facilitated diffusion involves the movement of larger or polar molecules (e.g., glucose, ions) across the cell membrane with the help of specific transport proteins, such as channel or carrier proteins.
Step 5: Define osmosis. Osmosis is the diffusion of water molecules across a selectively permeable membrane, moving from an area of higher water concentration to an area of lower water concentration.
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