9.2 Flashcards
What is osmosis?
The movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Diffusion requires energy input.
False
Osmosis specifically refers to the movement of ______.
water
What is diffusion?
The process by which molecules spread from areas of high concentration to areas of low concentration.
Which type of transport does facilitated diffusion involve?
Passive transport through protein channels.
Which of the following is an example of diffusion? A) Water moving through a cell membrane B) Sugar dissolving in water C) Ions moving against a concentration gradient
B) Sugar dissolving in water
What role do transport proteins play in facilitated diffusion?
They assist in the movement of specific molecules across the cell membrane.
True or False: Osmosis can occur without a membrane.
False
What is the primary difference between active transport and facilitated diffusion?
Active transport requires energy, while facilitated diffusion does not.
What happens to a cell placed in a hypertonic solution? A) It swells B) It shrinks C) It remains the same
B) It shrinks
What is meant by the term ‘selectively permeable membrane’?
A membrane that allows certain substances to pass while blocking others.
True or False: Facilitated diffusion can occur against a concentration gradient.
False
What types of molecules typically undergo facilitated diffusion?
Large or polar molecules such as glucose and ions.
