Multiple Choice
In the context of passive transport, how is osmosis different from diffusion?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, facilitated diffusion is used to transport which type of substance across a cell membrane?
A
Large or polar molecules (e.g., glucose or ions) down their concentration gradient via specific membrane proteins
B
Any molecules from low to high concentration using ATP-powered pumps
C
Water exclusively through the phospholipid bilayer without the aid of membrane proteins
D
Macromolecules such as proteins by vesicle-mediated endocytosis
Verified step by step guidance1
Understand that passive transport involves the movement of substances across the cell membrane without the use of cellular energy (ATP).
Recall that facilitated diffusion is a type of passive transport that requires specific membrane proteins to help substances cross the membrane.
Identify the types of substances that cannot easily cross the phospholipid bilayer due to their size or polarity, such as large or polar molecules like glucose or ions.
Recognize that facilitated diffusion moves these substances down their concentration gradient, meaning from an area of higher concentration to an area of lower concentration.
Contrast facilitated diffusion with other transport mechanisms: active transport uses ATP to move substances against their gradient, water can move through aquaporins rather than directly through the bilayer, and macromolecules are transported by vesicle-mediated processes like endocytosis.
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