True or False, Biology?
1. Diffusion is an active process that requires a cell to expend a great deal of energy.
2. During diffusion, molecules diffuse from a region where their concentration is low to a region where their concentration is higher until they are evenly dispersed.
3. A cell placed in a strong salt solution would probably burst because of an increase in osmotic pressure.
4. When the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell, the cell solution is isotonic relative to its environment.
5. Diffusion occurs only in living systems.
6. Ion channels are usually able to transport only one type of ion.
7. In active transport, energy is required to move a substance across a cell membrane.
8. Both the sodium-potassium pump and the proton pump require energy to move particles across the cell membrane.
9. The sodium-potassium pump moves sodium and potassium ions against the concentration gradient.
10. Exocytosis helps the cell rid itself of wastes.
11. During the process of exocytosis, the cell membrane extends to engulf substances that are too big to pass through the cell membrane.
Comments
1. Diffusion is an active process that requires a cell to expend a great deal of energy.
F - it's like a ball rolling down hill.
2. During diffusion, molecules diffuse from a region where their concentration is low to a region where their concentration is higher until they are evenly dispersed.
F - the opposite is true, high concentration to low concentration.
3. A cell placed in a strong salt solution would probably burst because of an increase in osmotic pressure.
False - it would shrink, like when you put salt on a slug.
4. When the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell, the cell solution is isotonic relative to its environment.
True - This is the tern you hear called isotonic saline (for flushing your eye or washing your contacts) also called "normal saline"
5. Diffusion occurs only in living systems.
false -
6. Ion channels are usually able to transport only one type of ion.
True - The transport is built on the shape of the molecule.
7. In active transport, energy is required to move a substance across a cell membrane.
True - this is the "active" part.
8. Both the sodium-potassium pump and the proton pump require energy to move particles across the cell membrane. True
9. The sodium-potassium pump moves sodium and potassium ions against the concentration gradient. video2
10. Exocytosis helps the cell rid itself of wastes. True- It's a kick-out process like an exorcism, get out bad spirits :-) see video1.
11. During the process of exocytosis, the cell membrane extends to engulf substances that are too big to pass through the cell membrane. False - (see video1)