is the degree to which the size of an image is larger than the object itself.
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resolution
is the degree to which is is possiible to distinguish between two objects that are very close together.
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micrometer
is equal to one millionth of a meter. it is the standard unit for mesuring cell dimension.
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nnometer
is one thousandth of a micrometer. it is therefore one thousand millionth of a meter. it is a useful unit for measuring the sized oforganelled within cells andfor measuing the size of large molecules.
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staining
in microscopy refers to any process that helps to reveal or distinguish different features. in light microscopy , stains may be colours or flourescen dyes. in electron microscopy they are metal particles or metal salts.
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cytoskeleton
refers to the network of protien firbres found withn cells that gives structure and shpe to the cell and also moves organelles arund inside cells.
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organelle
refers to a particular sturucture of a cell that has a specialised function.. some organelles are membrane-bond, others are not. Al perform a particular rolein the life processes of the cel.
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phospholipid bilayer
is the basic structural component of plasma membrane. it consists of two layers of phospholipid molecules. protiens are embedded in this layer.
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fluid mosaic
refers to the model of cell membrane sturcture. the lipid molecules give fluididty and proteins in the membrae give it a mosaic apperance. the molecules can move about.
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cell singnaling
cells communication with one another by signals. many molecules act as signals- some signal duringprocesses taing plce inside the cell; others signal form one cell to others. cytokines are an example of celll signaling.
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diffusion
is the movement of molecules from a region of high concentration of that molecule to a region of lower concentration of that molecule down a concentration gradient through a partyl permeable membrane.
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active transport
refers to the movemnet of molecules or ions across membranes which use ATP to drive protien 'pumps' within the membrane.
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solute
a substance that dissolves in a liquid
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solvent
a liquid that dissolves substances
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solution
a liquid containing dissolved substances
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the cell cycle
describesthe events that take place as one parent cell divides to produce two new daughter cells wich then each grown to full size.
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mitosis
refers to the process of nuclear division where two genetically identical nuclei are formed from one parent cell nucleus
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clones
geneticlly identical cells or organisms derived form one parent
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differentitation
refers to the changes occurring in cells of a mulitcellular organsim so that each different type ofcel becomes specicalise to perform a specifc function.
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tissue
a collection of similre cells that carry out a specific function
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organ
a collection of tissues that work together t carry out a specifc function
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Other cards in this set
Card 2
Front
is the degree to which is is possiible to distinguish between two objects that are very close together.
Back
resolution
Card 3
Front
is equal to one millionth of a meter. it is the standard unit for mesuring cell dimension.
Back
Card 4
Front
is one thousandth of a micrometer. it is therefore one thousand millionth of a meter. it is a useful unit for measuring the sized oforganelled within cells andfor measuing the size of large molecules.
Back
Card 5
Front
in microscopy refers to any process that helps to reveal or distinguish different features. in light microscopy , stains may be colours or flourescen dyes. in electron microscopy they are metal particles or metal salts.
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