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Biology chapter 3
Cells :Structure & functions
23
Science
Undergraduate 1
10/13/2010

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Term
CELL
Definition
the smallest unit of life that can function independently and perform all the necessary functions of life, including reproducing itself.
Term
Eukaryotic Cell
Definition
Has a central control structure called a nucleus which contains cell's DNA.
Term
Prokaryotic Cell
Definition
Does not have a nucleus; it's DNA simply resides in the middle of the cell.
Term
Plasma Membrane
Definition
Encloses cell contents: DNA, ribsomes, and cytoplasm
Term
Cytoplasm
Definition
Jelly-life fluid insie cell
Term
Ribosomes
Definition
Granular bodies in the cytoplasm that convert genetic information into protein structure
Term
DNA
Definition
One or more circular loops containing genetic information.
Term
Endosymbiosis Theory
Definition
Developed to explain the presence of two organelles in eukaryotes, choloroplasts in plants and algae, and mitochondria in plants and animals.
Term
Selective Permeability
Definition
contain certain protein channels that allow only certain molecules to pass.
Term
Passive Transport
Definition
the spontaneous diffusion of molecules across a membrane
Term
Diffusion
Definition
The movement of molecules down their concentration gradient
Term
Solutes
Definition
Substances dissolved in a solution
Term
Hyperosmotic Solution
Definition
Higher concentration of solutes than the cell
Term
Hyposmotic Solution
Definition
lower concentration of solutes than the cell
Term
Isotonic Solution
Definition
equal concentration of solutes as the cell
Term
Osmotic pressure
Definition
Movement of water into a cell. Can cause a cell to swell and burst.
Term
Exocytosis
Definition
Discharge of material from vesicles at the cell surface
Term
Endocytosis
Definition
The plasma membrane envelops particles and brings them into the cell interior.
Term
Mitochondria
Definition
Extract energy from organice molecules through oxidative metabolism. Posses circular DNA, divide by simple fission
Term
Lysosomes
Definition
Round,membrane- enclosed, acid-filled vesicles that function as a cell's garbage disposal.
Term
Endoplasmic Reticulum
Definition
Where cells build proteins and disarm toxins
Term
Golgi Bodies
Definition
Flattened stack of membranes that are scattered throughout the cytoplasm
Term
Chloroplast
Definition
Energy-capturing center, posses DNA, DIVIDE by simple fission
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