A Prokaryotic Cell

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Directions: Match the structure with the correct function.

___Most unicellular organisms, such as bacteria, that do not have membrane bound organelles.

___Site for protein synthesis.

___Supports and protects the cell

___Maintains homeostasis by its selective permeability.

___Coaled up DNA into a circular loop.

___The region of the cell that contains genetic information.

___Gelatinous-like fluid mostly composed of water.

___Long projections that move with a whip-like motion.

a) Prokaryoticb) Ribosomec) Cell Wall

d) Plasma Membranee) Plasmidf) Nucleoidg) Flagella

h) Cytoplasm

Prokaryotic Cells

• oldest single-celled organisms• most common cell• found almost everywhere• no true nucleus• bacteria

Cell Wall• rigid and inflexible wall

• thick, tough, fibrous barrier• very porous

• Supports and protects the cell

Plasma Membrane• flexible boundary • lipid bilayer• maintains homeostasis• selectively permeable• allows nutrients, ions, and other

substances across the membrane through protein channels

Cytoplasm• clear, gelatinous fluid• contains all the

necessary parts of a prokaryotic cell

• composed mostly of water

Ribosomes• floats freely in the cytoplasm• receive and translate genetic information• site for protein synthesis

Actual structure of a ribosome

Nucleoid• region of DNA• DNA is condensed into a circular loop PLASMID• How is this different from a nucleus?

Flagella

• long projections• produce whip-like motions• major means of

locomotion/movement for cell

Site of protein synthesis

Contained in the nucleoid, condensed into circular loop called PLASMID

Major means of locomotion

Supports and protects the cell

Selectively permeable to maintain homeostasis

Gel-like fluid in cell, mostly composed of water

Quick Review___ Most unicellular organisms, such as bacteria, that

do not have membrane bound organelles. PROKARYOTE

___ Site for protein synthesis. RIBOSOME

___ Supports and protects the cell CELL WALL

___ Maintains homeostasis by its selective permeability.

PLASMA MEMBRANE

___ Coaled up DNA into a circular loop. PLASMID

___The region of the cell that contains genetic information.

NUCLEIOD

___Gelatinous-like fluid mostly composed of water. CYTOPLASM

___ Long projections that move with a whip-like motion.

FLAGELLA

Eukaryotic Cell

Animal Cell• http://www.youtube.com/w

atch?v=PXbv95P3uhI

Plant Cell• http://www.youtube.com/w

atch?v=LMVQ-INMSVw&feature=related