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Cell + cell transport
Biology 1st semester
18
Biology
9th Grade
01/26/2009

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Term
Nucleus
Definition
- holds the DNA
- "brain of the cell"
- is only in eaukaryotes
Term
nucleolus
Definition
a dense region in the nucleus where tiny organelles are assembled to make proteins
Term
golgi bodies
Definition
-stack and sort membrane enclosed spaces and proteins.

-involved in protein symthesis (translation)
Term
Mitochondria
Definition
-supplies energy to the cell

-converts glucose > energy

-"powerhouse"
Term
flagella
Definition
-helps cells move

-external

-tail of a sperm
Term
lysosome
Definition
-breaks down waste and damaged materials

-contains enzymes
Term
Vacuole
Definition
-stores materials (water, carbs, salts...)

- involved in photosythesis
Term
chloroplast
Definition
-converts solar energy into chemical energy

-involved with photosynthesis

-in plant cells only
Term
ribosome
Definition
-links proteins

-where proteins are assembled

-in all cells

-it's involved in protein synthesis (translation)
Term
ER
Definition
-produce, process, and distribute proteins

-it is involved with protein synthesis
Term
cytoskeleton
Definition
-supports and shapes the cell
Term
cell membrane
Definition
-form a boundary between a cell and environment

-controls passage from in and out of the cell (selective permability)
Term
cell wall
Definition
-gives protection, support, and shapes the cell

-not in animal cells

-in most bacteria
Term
cytoplasm
Definition
-contains dissolved molecular building blocks

-holds stuff in place

-in every cell
Term
Diffusion
Definition
a movement of dissolved molecules in fluid or gas from a region of higher concentration to a region of lower concentration.
Term
Osmosis
Definition
-a diffusion of water molecules across a semipermeable membrane from an area of high water concentration to an area of lower water concentration.

-isotonic, hypotonic, hypertonic,
same shrink expand
Term
Active transport
Definition
- a cell uses energy to move a substance against a concentration gradient. (from lower to higher concentration)
Term
Passive transport
Definition
a movement of molecules across the cell w/out energy input from cell.
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