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Cell structure
7-12
6
Biology
Undergraduate 1
09/26/2006

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Term
Endoplasmic reticulum:
Definition
a set of tubular membranes that extends from the nuclear
envelope and is studded with ribosomes (rough ER). The proteins (polypeptides) that are formed here
either get incorporated into the cell membrane or are expelled from the cell.
Term
Free ribosomes:
Definition
proteins made here are used within the cell
Term
Smooth ER:
Definition
as the tubules get further away from the nucleus, the ribosomes get fewer,
thus smooth ER. Here lipids are synthesized and added to the new proteins.
Term
Vesicles:
Definition
membranous sacs that pinch off the end of the ER tubules, containing the new
proteins. Vesicles transport the new proteins to the next step in protein processing:
Term
Golgi bodies:
Definition
a stack of flat sacs where carbohydrates are synthesized. The carbohydrate
can be attached to proteins (glycoproteins) or lipids (glycolipids).
Term
Mitochondria:
Definition
“power house” of the cell. Where energy (ATP) is extracted from glucose
by enzymes, ie. the last stages of respiration.
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