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Cell structure
biology
| Question | Answer |
|---|---|
| what is the function of the mitochondria | aerobic respiration |
| what is the function of the ribosome | protien synthesis |
| what is the function of the cell membrane | controls movement |
| what is the function of the vacuole | stores nutrients |
| what is the function of the nucleus | contains DNA |
| what two materials are exclusive to the plant cell | vacuole, chloroplasts |
| what material is exclusive to the animal cell | plasma membrane |
| what 2 microscopes are most commonly used to view cells | electron and light |
| what is magnification | no. of times larger an image is than the actual object |
| what is resolution | minimum distance between 2 points at which they can be distinguished |
| how much can a light microscope magnify | 2000x |
| how much can an electron microscope magnify | 500,000x |
| when was the electron microscope developed | 1931 |
| what does cm stand for | centimetres |
| what does mm stand for | milimetres |
| what does nm stand for | nanometres |
| what does pm stand for | micrometres |
| how much of a milimetre is a micrometre | 1/1000 |
| how much of a micrometre is a nanometre | 1/1000 |
| what is 1pm in nm | 1000 |
| what is 1mm in pm | 1000 |
| what is the formula to find magnification | Image/actual |
| what is the 1st step to calculating the magnification from a scale bar | measure the length of the scale bar in mm |
| what is the 2nd step to calculating the magnification from a scale bar | convert mm to pm |
| what is the 3rd step to calculating the magnification from a scale bar | divide the length in pm by the length written on the scale bar |
| how does an electron microscope work | beams of electrons are passed through a specimen, electrons are absorbed by specimen and picked up by an electron detector |
| what is freeze fracture | freeze a sample, break sample, use electron microscope to see internally |
| what is immunoflourescene | fluorophore is attatched to antibodies for antigens, antibodies bind with antigen, antigen is tagged, light microscope |
| what does TEM stand for | transmitted electron microscopy |
| what does SEM stand for | scanning electron microscopy |
| how does TEM microscopy work | beam of electrons transmitted through specimen and focused to produce an image |
| how does SEM microscopy work | beam of electrons is sent out across surface of specimen, reflected electrons are collected |
| what is resolving power | ability of a lense to distinguish between 2 lines |
| how much is TEMs resolving power | 0.5pm |
| what is TEMs magnification | 500,000 |
| what is SEMs magnification | 100,000 |
| how much is SEMs resolving power | 3-10pm |
| what can SEM do that TEM can't | produce 3D images |
| what is endosymbiosis theory | eukaryotes eveolved from prokaryotes |
| what size are prokaryotes | 10-100 microns |
| are prokaryotes unicellular or multicellular | unicellular |
| what is a an example of a prokaryote | E.Coli |
| what type of ribosome does a prokaryote have | ribosome 70s |
| what are ribosome 70s made of | RNA and protien |
| what are ribosome 70s made for | protien synthesis |
| are prokaryote ribosomes smaller or bigger than eukaryote ribosomes | smaller |
| what is a flagella for | propels the cell with whip motion |
| what is mitosis | 2 daughter cells are produced genetically identical to their parent |
| what is another word for mitosis | binary fission |
| what type of ribosome is found in eukaryotes | ribososme 80s |
| where are ribosome 80s found | cytoplasm and rough endoplasmic reticulum |
| what is the nucleolus made of | RNA |
| what is the nucleus made of | chromatin |
| what is contained in chromatin | DNA |
| what does smooth endoplasmic reticulum produce | sex hormones |
| what cell is the chloroplast found in | plant cell |
| what is the chloroplast for | site of photosynthesis |
| what is the size of eukaryotes | 10pm |
| what is the size of prokaryotes | <10pm |
Created by:
Georgie007
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