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Parts of the Cell
Parts of the cell and their definitions
25
Biology
9th Grade
09/16/2009

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Term
Organelles
Definition
Structures inside the cell that carries out one or more of the cell's life functions
Term
Cell Plasma Membrane
Definition
Composed of a lipid bilayer, it regulates material entering and leaving the cell (non-polar middle, polar heads)
Term
Cell Wall
Definition
though fibrous material (cellulose) surrounding plant cells. Provides structure and support
Term
Cytoplasm
Definition
gel like substance in which the organelles are suspended
Term
Nucleus
Definition
the part of a eukaryotic cell surrounded by nuclear membrane which contains DNA
Term
Nucleolus
Definition
located inside the nucleus, it contains DNA and RNA from which the ribosomes are made
Term
Nuclear Membrane
Definition
Regulates what enters and leaves the nucleus
Term
Chromosomes
Definition
In nucleus, composed of DNA and proteins that form rod shaped structures prior to cell devision
Term
Chromatin
Definition
found in nucleus, combination of DNA and histone proteins that form chromosomes
Term
Mitochondria
Definition
Present in eukaryotic cells, breaks down glucose to produce ATP for energy (cell respiration). Evolved from bacteria. They contain their own circular DNA and reproduce on their one. You inherit them from your mother.
Term
Vacuole
Definition
Large membrane-enclosed sac filled with fluid, food, or pigments. Plants have one large central --- that also serves as a disposal site and helps maintain turgor pressure.
Term
Rough Endoplasmic Reticulum
Definition
channel network for moving proteins and lipids
Term
Ribosomes
Definition
Site where proteins are manufactured, all cells have these
Term
Golgi Apparatus
Definition
Flat membrane bound sacs which modify, sort, and package cell products such as proteins/lipids
Term
Vessicles (Pinocytic)
Definition
packaged cell secretions (hormones, neurotransmitters) at the Golgi apparatus. Transported to the cell surface for release
Term
Lysosome
Definition
membrane bound organelle that contains enzymes which digest food and worn-out cell components inside the cell
Term
Peroxisomes
Definition
contain 50 different enzymes (catalase) product from poisons
Term
Chloroplast
Definition
membrane bound organelle in plants that converts light energy to chemical energy (photosynthesis). Evolved from bacteria and contain their own DNA
Term
Cytoskeleton
Definition
Several crisscrossed protein fibers that provide cell shape and allow for internal cell movement (organelles/cell devision/ cell membrane). Made of microfilaments, microtubules and actin filaments
Term
Pinocytic Vesicles
Definition
Infolding of the plasma membrane used as a method of taking in large molecules
Term
Cilia and Flagella
Definition
Projections from the cell made of microtubules that are motile and designed either to move the cell itself or to move substances over or around the cell. --- have the same structure but are longer
Term
Prokaryotic
Definition
cells that lack both a nucleus and membrane bound organelles (bacteria)
Term
Eukaryotic
Definition
Cells that have a nucleus and membrane bound organelles (plants, animals, fungi)
Term
Multi-cellular
Definition
Organisms composed of more than one cell
Term
Unicellular
Definition
Organism composed of one cell
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