Web Animations Post Quiz Chapter 5
Plasma Membrane Structure and Transport
This activity contains 3 questions.
How does facilitated diffusion differ from passive diffusion?
No energy is used to move molecules across the membrane.
Membrane proteins help move molecules across the membrane.
Molecules move from a region of higher concentration to a region of lower concentration.
Facilitated diffusion is used to move water and small, uncharged molecules through a membrane.
Lactose transport by membrane proteins occurs under conditions in which the concentration of lactose inside the cell is higher than the concentration outside the cell. What type of transport is used to transport lactose into the cell?
The plasma membrane is composed of two rows of phospholipids oriented such that their nonpolar hydrophilic tails face each other and their polar hydrophobic head regions face the watery environment.
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