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Osmosis and Diffusion
Transport Mechanisms
The Cell Membrane
Passive Transport
Active Transport
100
This organelle is involved in the transport of things in and out of the cell in osmosis and diffusion.
What is the cell membrane?
100
When cells move in and out of the cell using the cell membrane and a vesicle, the process is either __________ or _________________.
What is What are endocytosis and exocytosis?
100
The composition of the cell membrane.
What is a phospholipid bilayer?
100
Passive transport requires no energy to move molecules from an area of _______ concentration to an area of ________ concentration.
What is from high to low concentration?
100
The cell using its own energy to move molecules across the plasma membrane against the concentration gradient is known as
What is active transport?
200
This process occurs when substances move in and out of the cell from areas of high concentration to areas of low concentration.
What is Diffusion?
200
The primary difference between passive transport and active transport is that active transport uses __________ while passive transport does not.
What is energy?
200
Since the fatty acid tails of the phospholipid bilayer are ____________ the cell membrane is selectively permeable.
What is hydrophobic?
200
The passive transport mechanism by which small, nonpolar molecules like oxygen and carbon dioxide or lipid soluble molecules pass directly through the cell membrane.
What is simple diffusion?
200
Energy for the Sodium-Potassium pump comes from this molecule.
What is ATP?
300
This process occurs when water moves in and out of the cell.
What is Osmosis?
300
The transport mechanism that brings large particles into the cell using the cell membrane and a vesicle is called this.
What is Endocytosis?
300
These macromolecules are embedded in the cell membrane and serve a number of functions. Some function as channels or membrane pores; others as carrier molecules. Some bind signal molecules while others play a role in cell recognition.
What are proteins?
300
Mechanism of glucose transport across cell membranes.
What is facilitated diffusion (through a carrier protein)?
300

What type of protein is used in active transport to move substances across the membrane?

What is a protein pump

400
Higher concentration of dissolved substance in relation to another solution.
What is Hypertonic?
400
When small particles enter the cell using a protein, but no energy, this type of transport mechanism is being used.
What is facilitated diffusion?
400
The __________ ___________ of the membrane are directed to the outside of the cell membrane in contact with the cytoplasm and extracellular fluid.
What are the polar (phosphate) heads?
400
Passive Transport occurs ___________the concentration gradient.
What is with/along?
400
The active transport mechanism that drives 3 sodium ions out of the cell in exchange for 2 potassium ions into the cell.
What is the sodium potassium pump?
500
Difference in concentration across a membrane.
What is Concentration Gradient?
500

Why can’t ions pass directly through the membrane?  

What is because they are charged and the membrane is hydrophobic?

500
The state in which the distribution of a substance is even across the cell membrane.
What is equilibrium?
500
What solution has a concentration of solutes is the same inside and out?
What is Isotonic?
500
Active transport uses energy to move molecules ________ their concentration gradient from _______ to ________ concentration.
What is "against" their concentration gradient from low concentration to high concentration?