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Membrane Transport
| Question | Answer |
|---|---|
| What are the 5 ways of transport across a membrane? | Diffusion, Osmosis, Active Transport, Exocytosis and Endocytosis |
| What is Diffusion? | The net movement of molecules or ions from regions of high concentration to low concentrations |
| When will diffusion stop? | When an Equilibrium is reached |
| Does Diffusion use ATP? | NO it is a passive movement |
| What are some of the molecules that can easily be diffused across the cell membrane? | Oxygen and Carbon Dioxide |
| What is facilitated diffusion? | When larger hydrophilic molecules and ions are move through proteins, across the phospholipid bilayer. |
| What proteins are involved in facilitated diffusion? | Channel proteins and Carrier Proteins |
| What is the role of Channel proteins in facilitated diffusion? | Channel proteins have a specific shape that allows a specific molecule through. |
| What is the role of Carrier proteins in facilitated diffusion? | Carrier proteins have a specific site, that allows molecules to bind on to them. They they change shape and allows the molecule or ion to pass across the membrane. |
| Why is diffusion passive? | Because no ATP or metabolic energy is needed for the transport. |
| What is osmosis? | The net movement of water molecules from a high concentration to a low concentration of water molecules. |
| When will osmosis stop? | When an Equilibrium is reached. |
| Is energy needed for osmosis to take place? | NO |
| What is the membrane called that osmosis takes place over? | Partially- permeable membrane |
| What is Active Transport? | The movement of molecules across the cell membrane, against the concentration gradient (From low to high) |
| Why is energy needed in Active Transport? | Because substances need to be moved against the concentration gradient. |
| What proteins are involved in Active Transport? | Carrier Proteins |
| How are carrier proteins used in Active Transport? | Substances bind to the carrier proteins, and energy from ATP changes the shape of the protein, causing the substance to be released inside of the membrane |
| What is Endocytosis? | The movement of large particles across the cell surface membrane into the cell |
| What is Exocytosis? | The movement of large particles across the cell surface membrane out of the cell |
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stu036791
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