Wednesday, October 1, 2008

Biology

Cells & Their Functions:

Nucleus- selectively permeable to control movement in or out of the cell

Nucleolus- instrutions in DNA are copied here, works with ribosomes in the synthesis of protein

Cytoplasm- contains dissolved nutrients, helps dissolve waste products, responsible for movement, gives cell its shape

Mitochondria- the cell's main energy source (ATP)

Chloroplast- carries out the process of photosynthesis, contains chlorophyll which makes it green

Ribosome- assemble amino acids into proteins

Rough ER- helps transport proteins

Smooth ER- makes lipids, breaks down toxic substances

Golgi- serves as the packaging & distribution center of the cell

Vacuole- stores water and may contain many substances, when full the cell becomes rigid which causes the plant to stand upright

Cell Membrane- closes cell, separates the cell interior from outside surroundings

Cell Wall- surrounds cell membrane and provides structure & support

Lysosome- contains the cell's digestive enzymes which get rid of macromolecules & old cell organelles

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