Table of Contents
- 1 What can be transported by diffusion?
- 2 What molecules can cross the cell membrane by simple diffusion?
- 3 What are the similarities and differences between diffusion and active transport?
- 4 What is the major difference between facilitated diffusion and simple diffusion?
- 5 What are the 3 characteristics of diffusion?
- 6 Is simple diffusion or facilitated diffusion faster?
- 7 What are the similarities between facilitated diffusion and simple diffusion?
- 8 What are 3 types of active transport?
- 9 How does diffusion work across the cell membrane?
- 10 When do dissolved gaseous substances pass through the cell membrane?
What can be transported by diffusion?
In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space. For example, think about someone opening a bottle of cleaning ammonia in the middle of a room.
What molecules can cross the cell membrane by simple diffusion?
Simple diffusion occurs when the molecules are either very small or lipid soluble and pass through the phospholipid bilayer of the cell membrane. Some examples of substances that use this process are oxygen (O2), carbon dioxide (CO2), and lipids.
What substances move freely by diffusion?
Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse across cell membranes. Larger molecules or charged molecules often require an input of energy to be transported into the cell. Even when equilibrium is reached, particles do not stop moving across the cell membrane.
What are the similarities and differences between diffusion and active transport?
Diffusion and active transport are two methods of transporting molecules across the cell membrane. Diffusion is a passive process, but active transport requires metabolic energy or an electrochemical gradient for the transportation of molecules across the membrane.
What is the major difference between facilitated diffusion and simple diffusion?
In simple diffusion, the movement of particles takes place with the direction of the concentration gradient. In facilitated diffusion, the movement of molecules can take place in both ways – along the direction and opposite of the concentration gradient.
What are 3 examples of passive transport?
Three common types of passive transport include simple diffusion, osmosis, and facilitated diffusion.
What are the 3 characteristics of diffusion?
It is inversely proportional to the molecular weight of the diffusing molecules, the density of the medium, and the distance over which the molecules are to diffuse. Diffusion can occur through membranes–permeable or semipermeable.
Is simple diffusion or facilitated diffusion faster?
The speed of simple diffusion is relatively slow. The speed of facilitated diffusion is comparatively fast. Simple diffusion is not solute specific.
What are two major differences between diffusion and active transport?
simple diffusion moves molecules down concentration gradient while active transport takes them against concentration gradient. Simple diffusion is passive, which means it does not require energy, while active transport does.
What are the similarities between facilitated diffusion and simple diffusion?
Simple diffusion and facilitated diffusion are similar in that both involve movement down the concentration gradient. The difference is how the substance gets through the cell membrane.
What are 3 types of active transport?
Carrier Proteins for Active Transport There are three types of these proteins or transporters: uniporters, symporters, and antiporters . A uniporter carries one specific ion or molecule. A symporter carries two different ions or molecules, both in the same direction.
How are substances moved across the cell membrane?
Movement across cell membranes Substances can move into and out of cells through the cell membrane. The three main types of movement are diffusion, osmosis and active transport.
How does diffusion work across the cell membrane?
Diffusion causes many substances to move across a cell membrane without the cell using energy. Water tends to diffuse from an area of high concentration to an area of low concentration. Water will move across a membrane until equilibrium is reached.
When do dissolved gaseous substances pass through the cell membrane?
Diffusion Dissolved or gaseous substances have to pass through the cell membrane to get into or out of a cell. Diffusion is one of the processes that allows this to happen. Diffusion occurs when particles spread.
How is facilitated transport different from simple diffusion?
Facilitated transport is a type of passive transport. Unlike simple diffusion where materials pass through a membrane without the help of proteins, in facilitated transport, also called facilitated diffusion, materials diffuse across the plasma membrane with the help of membrane proteins.