cells

Nucleus

Location: Often near the center

Organization: Double membrane with nuclear pores.

Function: Cell’s control center; contains DNA and nucleoli;

Ribosomes

Location: Cytoplasm

Organization: No membrane, rRNA subunits

Function: Site of protein synthesis

Rough Endoplasmic Reticulum

Location: Cytoplasm

Organization: single membrane, enclosed channels with ribosomes.

Function: Protein production for export

Smooth Endoplasmic Reticulum

Location: Cytoplasm

Organization: enclosed channels without ribosomes

Function: Lipid and steroid synthesis, detoxification.

Golgi Apparatus

Location: Cytoplasm

Organization: single membrane, cirternae as flattened sacs forming vesicles.

Function: Assembly of macromolecules, transport from cell for secretion.

Lysosome

Location: Cytoplasm

Organization: single membrane, contains hydrolytic enzymes

Function: Digestion of material

Peroxisome

Organization: single membrane, contains peroxidase

MitochondrionFunction: Conversion of hydrogen peroxide to water and oxygen.

Mitochondrion

Location: Cytoplasm

Organization: Double membrane, rod-shaped with cristae.

Function: ATP production, fatty acid oxidation.

Microtubule

Location: Cytoplasm

Function: Supports cytoplasm; assists in cell division and forms components of cilia and flagella.

Centrioles

Location: Cytoplasm

Function: Facilitate the movement of chromosomes during cell division.

Flagella

Location: On the sperm cell surface with one per cell.

Function: Propel sperm cells

Cilia

Location: on the cell surface

Function: Move substances over surfaces of certain cells

Microvilli

Location: Extensions of cell surface with many on each cell

Function: Increase surface area of certain cells.