Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
C3)CM, EC, CS
Cell membrane, endo/exocytosis and cytoskeleton
| Question | Answer |
|---|---|
| Define plasma membrane. | A very thin transparent structure which encloses the contents of the cell. |
| Define fluid mosaic model. | A model which proposes that membranes consists of a double layer of lipids containing some protein molecules. |
| Define active transport. | A process by which solute may be pumped across the cell membrane requiring energy. |
| Define difussion. | A process by which particles randomly move from areas of low to high concentration (with the concentration gradient). |
| Define osmosis. | The diffusion of water across a partially permeable membrane to achieve equilibrium. |
| Define endocytosis. | A process in which cell takes in materials from the outside by engulfing and fusing them with its plasma membrane. |
| Define pinocytosis. | A process of taking in fluid together with its contents into the cell by forming narrow channels through its membrane that pinch off into vesicles, and fuse with lysosomes that hydrolyze or break down contents. |
| Define phagocytosis. | Movement of larger particles into a cell. |
| Define exocytosis. | The process in which the cell releases larger particles to the outside by discharging them as membrane-bounded vesicles passing through the cell membrane |
| Define receptor molecule. | Protein molecules in the cell membrane which are capable of receiving a stimulus and transmitting it through the membrane causing a response in the cell. |
| Define antigen. | A foreign substance to the cell or organism. |
| Define antibody. | A specific protein molecule that is produced by white blood cells in response to an antigen. |
| What makes endo/exocytosis possible? | a |
| What makes active transport possible? | a |
| What makes antigen recognition possible? | a |
| What makes communication between cells possible? | a |
| What makes contact inhibition possible? | a |
| The insecticide DDT is soluble in lipids. Suggest why it accumulates so readily in cells. | a |
| Define semi-permeable and give examples. | a |
| Define cytoskeleton. | An internal framework of microtubles and microfibres which has important roles in cellular structure and function. |
| Where is the cytoskeleton organised by? | The centrosome or 'micro-tubule organising centre' MTOC, a small body located near the nucleus. |
| What does the centrosome do in animal cells? | Produces centrioles during cell division which are actually bundles of microtubules. |
| Diameter of microtubules? | Approximately 25 nm. |
| Diameter of intermediate filaments? | Approximately 10 nm. |
| Diameter of microfilaments? | Approximately 7nm. |
| What is the 1st main function of the cytoskeleton? | 1) In animal cells, to assist with the assembly of the spindle fibres which pull apart chromatids in anaphase. Spindle fibres are made of proteins similar to the ones found in muscles. |
| What is the 2nd main function of the cytoskeleton? | Microtubules and micropindles are able to contract and have an important function in changing the shape of cells and assisting movement. Important in cellular processes like pseudopodia, movement of cilia and flagella and cytoplasmic streaming. |
| What is the 3rd main function of the cytoskeleton? | Important in the anchorage and movement of organelles within cells, particularly cell division. |
Created by:
MahaliaMcD
Popular Biology sets