Chapter 7 “A View of the Chapter 7 “A View of the Cell”Cell” p. 170 – 193p. 170 – 193

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COMMON CELL TRAITSCOMMON CELL TRAITS A A cellcell is the is the

smallest unit smallest unit that is capable that is capable of performing of performing life functionslife functions..

COMPARING CELLSCOMPARING CELLS

The The sizesize & & shapeshape of a cell relates to of a cell relates to its its functionfunction. (job it . (job it does)does)

Prokaryotic CellsProkaryotic Cells(proh KAYR ee yah tihk)(proh KAYR ee yah tihk)

cells cells withoutwithout membrane-bound membrane-bound structuresstructures

EXEX: : bacteriabacteria

pond scumpond scum

Eukaryotic CellsEukaryotic Cells(yew KAYR ee yah tihk) (yew KAYR ee yah tihk)

cells cells withwith membrane-bound membrane-bound structuresstructures

EX: EX: animalsanimals, , plantsplants, , fungifungi and and protistsprotists

protectsprotects the cell the cell gives gives shapeshape is made of is made of cellulosecellulose A cell wall is found in A cell wall is found in plantsplants, , algaealgae, ,

fungifungi, & most , & most bacteriabacteria..

CELL WALLCELL WALL

CELL MEMBRANECELL MEMBRANE

Outer covering, Outer covering, protective layerprotective layer around around ALLALL cells cells

For cells with cell For cells with cell walls,the cell membrane is walls,the cell membrane is inside the cell wallinside the cell wall

Allows Allows foodfood, , oxygenoxygen, & , & waterwater into the cell & into the cell & wastewaste products out of the products out of the cell.cell.

CYTOPLASMCYTOPLASM

gelatin-likegelatin-like inside cell membrane inside cell membrane constantly constantly flowsflows aka aka protoplasmprotoplasm

CYTOSKELETONCYTOSKELETON

scaffoldingscaffolding-like -like structure in structure in cytoplasmcytoplasm

helps the cell helps the cell maintainmaintain or or changechange its shapeits shape

made of made of proteinprotein

NUCLEUSNUCLEUS Directs all Directs all cell cell

activitiesactivities Contains Contains instructionsinstructions

for everything the for everything the cell doescell does

These instructions These instructions are found on a are found on a hereditaryhereditary material material called called DNADNA

Usually the Usually the largestlargest organelleorganelle

NUCLEAR MEMBRANENUCLEAR MEMBRANE

separates separates nucleusnucleus from from cytoplasmcytoplasm

controls movement controls movement of materials of materials in & outin & out of nucleusof nucleus

NUCLEOLUSNUCLEOLUS

Aka “Aka “little nucleuslittle nucleus” ” Found in the Found in the

nucleusnucleus Ribosomes made Ribosomes made

herehere

CHROMATINCHROMATIN contains contains genetic codegenetic code that controls cell that controls cell made of made of DNADNA & & proteins proteins (deoxyribonucleic acid) (deoxyribonucleic acid)