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Cell Structure
Different cell parts
26
Biology
12th Grade
11/17/2009

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Term
CELL WALL
Definition
Structure that surrounds a plant wall. Maintains the cell's shape and rigidity.
Term
CELL MEMBRANE
Definition
"Gate keeper" of cell. Composed of phospholipid bilayer with protein molecules. Regulates entrance and exit of molecules. Separates contents of cell from enviroment.
Term
CHROMATIN
Definition
Long double-stranded molecule of DNA and proteins. Contains all genetic information.
Term
CRISTAE
Definition
Increases surface area for cellular respiration and the production of ATP.
Term
CYTOPLASM
Definition
Contains water and different organelles. Assists in the production and distribution of molecules.
Term
CYTOSKELETON
Definition
3-D network of protein fibres. Provides a framework within the cytoplasm for organelle movement, cell shape, movement of substances within the cell and cellular motility.
Term

GOLGI BODIES/APPARATUS

 

Definition
Modifies/process, packages, stores, and distributes proteins and lipids produced by ER into vesicles to be exported to other sites in the cell into lysosomes.
Term
LYSOSOME
Definition
Contain hydrolytic enzymes. Used for intracellular digestion of food-filled vesicles by hydrolytic enzymes. Auto digestion of damaged cell parts. Destruction of cells by hydrolytic enzymes.
Term
MATRIX
Definition
Contains DNA, RNA, ribosomes, proteins, enzymes. Assists in the chemical production of ATP.
Term
NUCLEAR ENVELOPE
Definition
Forms a boundary separating contents of nucleus from cytoplasm.
Term
NUCLEAR PORE
Definition
Allow transfer of molecules between nucleolus and cytoplasm.
Term
NUCLEOLUS
Definition
Found within the nucleus. Ribosome synthesis.
Term
ORGANELLES
Definition
Membranous structure in the cytoplasm, having a specific function and structure.
Term

POLYSOMES

 

Definition
A linear collection of several ribosomes attached to one mRNA. Produces many copies of polypeptides.
Term
RIBOSOMES
Definition
Site of protein synthesis.
Term
ROUGH ENDOPLASMIC RETICULUM
Definition
Have ribosomes attached. Abundant in villi. Attached ribosomes produce proteins.
Term
SMOOTH ENDOPLASMIC RETICULUM
Definition
No ribosomes attached. Synthesizes sex hormones. Detoxifies alcohol, drugs and poisons in the liver.
Term
VACUOLE
Definition

Large membrane-enclosed sac. Storage of macromolecules.

 

Term
VESICLES
Definition
Two types: 1) Secretory: secretion of proteins 2) Lysosome: Intracellular digestion.
Term
PLASMA MEMBRANE
Definition
Membrane surrounding the cytoplasm that consists of a phospholipid bilayer. Regulates the entrance and exit of molecules from the cell.
Term
CELLULAR RESPIRATION
Definition
Use energy from carbohydrates to produce ATP molecules.
Term
CHLOROPLAST
Definition
Contains chlorophyll and is the site of photosynthesis.
Term
MITOCHONDRIA
Definition
ATP molecules are produced here  during the process of cellular respiration.
Term
NUCLEUS
Definition
In a eukaryotic cell. It contains chromosomes and controls the structure and functions of the cell.
Term
PHOTOSYNTHESIS
Definition
Process that plants and algae use to produce their own food using energy from the sun.
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