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Cell parts and functions
descriptions of the locations and functions of cell parts
14
Biology
10/30/2007

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Term
cell membrane
Definition
completely covers the entire animal cell and serves to hold it together. it regulates what molecules can enter or exit the cell.
Term
Nucleus
Definition
"communications center" this organelle directs all cell activity. Also is the location of the DNA (dioxiridonucleaic acid)
Term
Chromatin
Definition
a tangled mass of chromosomes: DNA.

Dioxiribonucleaicacid raped around a spool of histome.

DNA is the largest molecule known to man.
Term
Nuclear Membrane
Definition
A semipermiable layer that coats the nucleus. This membrane controls what enters the nucleus; this is determined by the molecular weight.
Term
Endoplasmic Reticulum
Definition
"super highway" - a series of channels for transport of materials throughout the cell


Two types:
1. smooth (without ribosomes)
2. rought (with ribosomes)
Term
Ribosomes
Definition
Protein Factories

RRNA- ribosomalribonucleaicacid
Term
Mitochondrion
Definition
"Powerhouse" of the cell

*sight of cell respiration*
C6H12O6?ATP

inner membrane = cristae (the membrane is squished)
Term
Golgi Body
Definition
series of flattened "sacs" (membrane) that temporarily store, sort, package and secrete cell products (lysosomes)
Term
Lysosomes
Definition
"clean up crew" - sacs of digestive enzymes
Term
Centrioles
Definition
ONLY IN ANIMAL CELLS!!!!

-come in pairs
-found near the nucleus
-9 sets of 3 microtubeules (very important in cell reproduction)
Term
Vacuole
Definition
"waste plant"

? rid the cell of unwanted debris
? isolates harmful materials
? contains all waste
Term
Cytoplasm
Definition
transparent gelatin surrounding all of the cell's organelles.

contains cytosol: helps break-down material for the organelles better use

the site of cell growth
Term
Chloroplasts
Definition
This is the organelle where photosynthesis occurs.

They capture the sunlight to produce energy.
Term
Cell wall
Definition
ONLY IN PLANT CELLS!!!

provides stucture as well as support

acts as a filtering system