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Unit 4
Structures of the Cell
17
Biology
11th Grade
10/03/2011

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Term
Plasma Membrane:
Definition

location: outer boundary of the cell


structure: bilayer of phosolipids


function: a barrier that also allows selective transport and interaction with the enviorment outside the cell.

Term
Endpolasmic Reticulum:
Definition

location: continuous with the membrane of the nucleaus

 

structure: series of folded, hollow, tube-like membranes.

 

function: provides large surface area for metabloic reactions & activities.  

 

 

Term
Smooth Endoplamic Reticulum:
Definition

structure: lacks ribosomes of its surface

 

function:

synthesizes steroids, oils, and phosolipids.

detoxifies poisons and drugs.

metabolizes carbohydrates and fats.

Term
Rough Endoplasmic Reticulum:
Definition

structure: appears dotted because it has ribosomes attached to its surface

 

functions:

assists ribosomes with the synthesis of proteins

contributes to plasma membrance formation - sends proteins and

  phosolipids to the membrane.

Term
Golgi Apparatus:
Definition

location: next to the rough endoplasmic reticulum

 

structure: several hollow, flattened membrance sacs

 

functions: acts as the "post office"

modifies proteins, packages &ships those proteins to other places

synthesizes polysacchardies and lipids

the "shipping container" for the Golgi Apparatus is the vesicle

Term
Lysosomes:
Definition

location: scattered throughout the cytoplasm, made by the Golgi

 

structure: tiny, circular sac containing digestive enzymes

 

functions: acts as the cell's "garbage disposal"

digests carbohydrated, proteins, lipds, and nucleic acids

destroys foreign pathogens

recycles cell materials and damaged organelles

 

Term
Peroxisomes:
Definition

location: scattered throughout the cytoplasm

 

structure: tiny, circular sac that contains enzymes

 

functions:

detoxifies alcohol

breaks down fatty acids

synthesizes chloestoral & bile acids

breaks down hydrogen peroxide with catalase enzyme

Term
Vacuoles & Vesicles:
Definition

location: scattered throughout cytoplasm

 

structure:

vacuoles: large membrance band sacs

vesicles: small membrance band sacs

 

function:

vacuoles: store foor water and minerals

vesicles: transport various cellular materials

Term
Mitochondria:
Definition

"power plant" of the cell, makes eneregy (atp)

 

structure: 2 phospholipid bilauer membranes: outer membrane which is smooth and permeable, and inner membrance which contains multiple folds called cristae, this increase surface area.

 

components: 2 components: intermembrane space - between inner and outer membranes and mitochondrial matrix - innermost chamber; fluid of mitochondria.

Term
Chloroplasts:
Definition

"farmhouse" of the cell; makes food in the form of sugar

 

structure: inner and outer membrance, phospholipid bilayer. they contain thylakaid membranes, flattened sacs that stack  on top of eachother.  Contain grana-stacks of thylakoid membranes.  Stroma- cellular fluid is inside the chloroplast.

Term
Chloroplasts & Mitochondria:
Definition

- membranes made of a bilayer with different phospholipids than other organelles

- contains their own DNA

- contain their own different ribosomes

- synthesize their own proteins

- have the ability to self replicate

Term
Ribosomes:
Definition

location: attached to rough ER or scattered throughout cytoplasm

 

structure: made of RNA & protein, contains a large and small subunit that combine to make protein

 

function: synthesize proteins

Term
Cytoskeleton:
Definition

location: attached to the plasma membrane; nuclear  membrane & throughout cell. - network of tubes, highway.

 

structure: protein fibers of varying thickness forming a cellelar skeleton.

 

functions

shape & support of the cell

movement of the cell

serves as a highway - vesicles & some organelles travel along the fibers

Term
Centrioles:
Definition

location: close to the nucleus in a region called the centrosome

 

structure: two sets of microtubules at right angles to each other

 

function: organizes microtubules into a pattern of fibers that attach to chromosomes during mitosis; pattern of fibers is called the mitotic spindle

Term
Cilia and Flagella:
Definition

location: on the outside of the plasma membrane

 

structure

cilia - short projections of the plasma membrane; many per cell

flagella - long structures extending from the membrane; one or

   two per cell

function: movement of the cell through enviornment or move

   things in the enviornment over the cell.

Term
Nucleus:
Definition

function: "brain" of the cell; controls all cellular activity

 

location: normally the dead center of the cell

 

structure: contains several components: nuclear membrane, nucleolus and chromatin.

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