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bio grade 10

cells & diffusion

TermDefinition
Nucleus Controls all activities of the cell, growth and reproduction
Cell Membrane Allows certain molecules to go in or out of the cell, which diffuse out of the cell. Made up of 2 phospholipid layers interconnected.
Cell Wall Supports & protects the cell; doesn't allow molecules in or out. (Only in plant cells)
Chromosomes Proteins that contain DNA which has coded info for making molecules.
Rough endoplasmic reticulum Produces & stores proteins
Smooth endoplasmic reticulum Produces & stores fats and oils
Golgi bodies Modifies & packages proteins from rough E.R with enzyme
Ribosomes Helps rough E.R make proteins; is attached to rough E.R
Centrioles Helps with the cell divisions (mitosis). Spindle fibres come from there
Mitochondria Converts sugar into energy
Cytoplasm Fluid in the cell : allows organelles to move around
Vacuole Stores water, minerals & vitamins, bigger in plant cells
Lysosomes Breaks down food, invading bacteria, old damaged organelles
Chloroplasts Uses sunlight to make its own food. (photosynthesis) CO2 + H20 + light --> sugar + O2
Diffusion Movement of molecules form areas of high concentration to low concentration.
Permeable Allows any molecule to diffuse across membrane
Semi-permeable Allows certain molecules to diffuse across membrane. Ex. cell membrane, skin
Non-permeable Allows no molecules to diffuse across membrane. Ex. cell wall.
Osmosis Movement of water molecules from high concentration of water to low concentration of water.
Created by: ruth.ali26
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