151359
Description
Flashcards by eimearkelly3, updated more than 1 year ago
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Created by eimearkelly3
almost 11 years ago
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| Question | Answer |
| Kingdom of the amoeba | Protista |
| Amoeba feed by | Encolsing its food with a drop of water inside a temporary food vacuole (phagocytosis) |
| Food vacuole | Small, membrane-bound space containg solid ingested food |
| How do digestive enzymes pass into the food vacuole? | From the cytoplasm |
| Where do the soluble particles of digestion go after digestion? | Pass out of the vacuole and into the cytoplasm |
| False feet | Pseudopodia |
| Reproduction | Binary fission |
| Binary fission | Cell splits into two identical daughter cells |
| Amoeba proteus | Harmless |
| Entamoeba histolytica | Amoebic dysentry Found in the Tropics Can prove fatal (vomiting, abdominal pain) |
| Outer cytoplasm | Ectoplasm |
| Ectoplasm | Outer cytoplasm, stiff, gel-like solid part, slows down the inflow of water and plays an imporatant role in the formation of pseudopodia. |
| Inner cytoplasm | Endoplasm |
| Endoplasm | Grainy, inner cytoplasm (due to food vacuoles and waste materials) More fluid than the ectoplasm. |
| Function of cell membrane | Retain cells contents and to allow gases to diffuse in and out of the cell |
| Function of the nucleus | Controls the cell |
| Function of the food vacuoles | Secrete acids to kill prey and then produce enzymes for the prey to be digested. Digested materail is absorbed from the food vacuole into the cytoplasm. |
| Function of the pseudopodia | Used for movement. The cytoplasm, especially the endoplasm, flows into the pseudopodia, causing the cell to move. The pseudopodia engulf or surround its prey. |
| Water moves....by osmosis | IN |
| Function of the contractile vacuole | Collects water that enters the amoeba. Swells, touches the cell membrane and bursts to expel the water. Resonsible for osmoregulation. |
| Osmoregulation | Regulating salt and water. The contractile vacuole maintains the amoeba's cytoplasm at a correct concentation for effictient metabolism. |
| Do marine and parasitic amoeba have contractile vacuoles? Why? | No, their external environment is almost identical in concentration (isotonic) |
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