Karteikarten
Cell structure
Karten in diesem Stapel (45)
- 1Compound microscope2 lenses (objective and eyepiece)
- 2Simple microscopeSingle lens
- 3Eyepiece lensMagnify the image
- 4NosepieceRevolves to put the desired lens into position
- 5Objective lensMagnifies the image
- 6StageHolds the slide, which contains the object
- 7Diaphragm leverControls the amount of light reaching the object
- 8CondenserFocuses light on the object (not always present)
- 9Mirror / light sourceTo supply light to the object
- 10Stage height adjustmentTo allow the long, high power lens to fit over the slide
- 11ClipTo hold the slide
- 12Fine adjustmentFor precise focusing
- 13Coarse adjustmentFor rough focusing
- 14The units in which cells are measuredmicrometres
- 15Cytoplasmliquid surrounding the nucleus incuding organelles
- 16CytosolThe liquid surrounding th enucleus not incuding organelles
- 17ProtoplasmAll living parts of the cell including the nucleus
- 18Stain for animal cellsMethylene blue
- 19Stain for plant cellsIodine
- 20Component of plant cell wallCellulose
- 21What does the vacuole contain?Cell sap - salts, pigments, sugars
- 22Function of the cell wallSupport
- 23TEMTransmission electron microscope
Sends a beam of electrons through a thin section of the specimen. This shows the internal structure of the specimen in great detail. - 24SEMScanning electron microscope
Uses a beam of electrons to provide a surface view of the specimen. - 25UltrastructureThe fine detail of a cell as seen with an electron microscope.
- 26Cell membranes are composed ofProteins, and phospholipids
- 27Water-lovingPhosphate head
- 28Water-hatingLipid tail
- 29Double layerBilayer
- 30Permeability of cell membranesSemi or selectively permeable
- 31transport using energyactive transport
- 32Functions of cell membranesThe surface of the membrane contains receptors that receive chemical messages from other parts of the body and bring them to the cell.
Membranes retain the cells contents
Membranes control what enters and leaves the cell. Membranes can allow the free passage of some molecules and prevent the passage of others. In this way they are said to be SELECTIVELY PERMEABLE. e.g. water and oxygen can pass freely but sodium ions and large proteins have to be moved across using energy (ACTIVE TRANSPORT)
Membranes give some support to the cell.
Membranes recognise molecules that touch them.
Membranes are in constant motion --> fluid mossaic model. - 33DNAdeoxyribonucleic acid
- 34number of chromosomes in humans46
- 35Live plant cells without a nucleusPhloem sieve tube cells
- 36Live animal cells without a nucleusRed blood cells
- 37Where are ribosomes made?Nucleolus
- 38MitochondriaSupply energy, aerobic astage of respiration, reproduction by means of binary fission
- 39ChloroplastsWhere photosynthesis takes place, contains the green pigment chlorophyll
- 40Light stage of photosynthesisGranum
- 41Dark stage of photosynthesisStroma
- 42Permeability of cell wallsFully permeable
- 43Function of ribosomesProtein synthesis
- 44ProkaryotesNo true nucleus or membrane-enclosed organelles
- 45EukaryotesTrue nucleus and membrane-enclosed organelles
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- Beschreibung
- Leaving Certificate Biology (Cell Structure) Karteikarten am Cell structure, erstellt von eimearkelly3 am 04/07/2013.
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- eimearkelly3
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