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y Definition:The nucleus is a membrane boundstructure that contains the cell's hereditary information and controls the cell's growth andreproduction. It is commonly the most prominentorganelle in the cell.

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Definition: (1) A minute particle composed of proteinand ribonucleic acid (RN A ) that serves as the site of 

protein synthesis.

(2) A sphere-shaped structure found in thecytoplasm of prokaryotic and eukaryotic cells.

Some ribosomes occur freely in the cytosol whereasothers are attached to the nuclear membrane or tothe endoplasmic reticulum (ER ) giving the latter arough appearance,

hence, the name rough ER or rER .

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Definition: Spherical or rod-shaped organelles

found within the cytoplasm of eukaryotic cells,and are referred to as the ³powerhouse of the

cell since they act as the site for the production

of high-energy compounds (e.g.ATP), which are

vital energy source for several cellular  processes.

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Definition: The cell¶s outer membrane made up

of a two layers of phospholipids withembedded proteins. It separates the contents of 

the cell from its outside environment, and it

regulates what enters and exits the cell.

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yDefinition: A complex of parallel,flattened saccules, vesicles, and vacuoles

that lies adjacent to the nucleus of a cell andis concerned with the formation of 

secretions within the cell.

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yDefinition: (1) A membrane-bounded organelle that occurs

as labyrinthine, interconnected flattened sacs or tubules that isconnected to the nuclear membrane, runs through

the cytoplasm, and may well extend into the cell membrane.

(2) One of the three components of the GERL system, in which

the Golgi apparatus and the lysosomes are the other components.

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yDefinition: A self-replicating, small,fibrous, cylindrical-shaped organelle,

typically located in the cytoplasm near thenucleus in cells of most animals. It is

involved in the process of nuclear division.

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yDefinition:  An endoplasmic

reticulum (ER ), a eukaryotic organelle madeup of a system of membranous tubes andsacs, that is studded with ribosomes on itssurface giving it a rough appearance under

the microscope(hence its name).

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yDefinition:  A thin, helical, single-stranded filament of the cytoskeleton found inthe cytoplasm of eukaryotic cells, composedof actinic subunits, and functions primarily inmaintaining the structural integrity of a cell and cell movements.

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yDefinition: (Science: cellbiology ) minute projections of cell

membranes whichgreatly increase the surface area of the cell.

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yDefinition:The round granular structure within the nucleus of a cell, and composed

of protein and RN A.

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y Definition: A complex of nucleic

acids (e.g. DN A or RN A ) and proteins (histones), whichcondenses to form a chromosome during cell division.In eukaryotic cells, it is found within thecell nucleus whereas in prokaryotic cells, it is found within the nucleoid. Its functions are to

package DN

 A into a smaller volume to fit in the cell,strengthen the DN A to allow mitosis and meiosis, and toserve as a mechanism to control expression.

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yDefinition:(MeSH)Electron-densecytoplasmic particles bounded by a single

membrane, such as PEROX ISOMES;GLY OX  YSOMES; and glycosomes.

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