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Cell Membranes - bio
| Question | Answer |
|---|---|
| What is every cell surrounded by? | a partially permeable membrane |
| What does a partially permeable membrane do? | it controls what enters and leaves the cell |
| Many organelles are .................. which help to insulate the metabolic reactions inside the organelles from those outside it | membranes |
| ........ also provide extra surface area for the attatchment of ..... and other molecults | membranes enzymes |
| What are membranes made of? | a phospholipid bilayer |
| what else does the membrane contain? | cholesterol glycolipids glycoproteins |
| Cells can ........ and ........... signals | send recieve |
| what part of a cell recieves signals? | the plasma membrane |
| substances that have ....., ............. molecules can diffuse passively through the phospholipid bilayer | small, uncharged |
| larger molecults and charged ions pass through channels formed by .......... | proteins |
| what type of movement goes against the concentration gradient? | faccilitated diffusion |
| what is the movement of water called? | osmosis |
| what does active transport require? | ATP |
| what is diffusion? | a passive net movement from an area of high concentration to an area of low concentration |
| cells placed in a solution that has a lower water potential than the cell contents ......... water by osmosis | lose |
| animal cells can become crenated if ........ | they lose too much water |
| plant cells can become plasmolysed if ...... | they lose too much water |
| cells produced in a higher waater potential than the cell gain water by ..... | osmosis |
| animal cells can ...... if they get too much water | burst |
| plant cells do not burst because of ....... | the strong cell wall that surrounds them |
| active transport takes place through .... | carrier proteins in the membrane |
| substances can be moved in bulk across a membrane by ...... or ....... | exocytosis or endocytosis |
| an increase in ....... increases the movement of molecules in a membrane increasing the membranes permeability | temperature |
| what does polar mean? | that the molecule has a slightly positive and slightly negative part |
| what do carrier proteins do? | actively move some substances across the membrane |
| that does a receptor site do? | some allow hormones to bind with the cell so that a response can carry out |
| what does cholesterol do? | gives the memranes of some eukaryotic cells mechanical stability |
| whats the definition of osmosis? | the passage of water from a region where it has a higher water potential to a region where it has a lower water potential through a partially permeable membrane |
Created by:
rachel1994
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