9.2 Bio Flashcards
What is the primary function of the cell membrane?
To regulate the movement of substances in and out of the cell.
True or False: The cell membrane is composed mainly of phospholipids.
True
Fill in the blank: The cell membrane is described as a __________ model.
fluid mosaic
What is simple diffusion?
The passive movement of molecules from an area of higher concentration to an area of lower concentration.
Which type of molecules can typically pass through the cell membrane via simple diffusion?
Small nonpolar molecules.
What is facilitated diffusion?
The process of transporting substances across a membrane with protein channels.
True or False: Facilitated diffusion requires ATP.
False
What role do transport proteins play in facilitated diffusion?
They help specific molecules cross the membrane.
What is active transport?
The movement of substances against their concentration gradient, requiring energy.
Which molecule is commonly used as an energy source for active transport?
ATP
Multiple Choice: Which of the following is an example of active transport? A) Osmosis B) Glucose Channel C) Simple Diffusion
B) Glucose channel
What is the difference between passive and active transport?
Passive transport does not require energy, while active transport does.
True or False: In facilitated diffusion, molecules move from low to high concentration.
False
What do channel proteins do in the cell membrane?
They provide passages for specific ions or molecules to enter or exit the cell.
What is hypertonic, hypo, and isotonic?
hyper, more solute, hypo less solute iso same solute amounts.
