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A large, membrane-bound, usually spherical
protoplasmic structure within a living cell,
containing the cell's hereditary material and
controlling its metabolism, growth, and
reproduction.
A small, typically round granular body composed
of protein and RNA in the nucleus of a cell. It is
usually associated with a specific chromosomal site
and involved in ribosomal RNA synthesis and the
formation of ribosomes.
The double-layered membrane
enclosing the nucleus of a cell. Also
called nuclear envelope
The semipermeable membrane that
encloses the cytoplasm of a cell.
A membrane network within the
cytoplasm of cells involved in the
synthesis, modification, and transport
of cellular materials.
A membrane-bound organelle in the
cytoplasm of most cells containing
various hydrolytic enzymes that
function in intracellular digestion.
A minute round particle composed of RNA and
protein that is found in the cytoplasm of living
cells and serves as the site of assembly for
polypeptides encoded by messenger RNA.
The protoplasm outside the nucleus
of a cell.
A small cavity in the cytoplasm of a
cell, bound by a single membrane and
containing water, food, or metabolic
waste.
a net-like structure in the cytoplasm of
animal cells (especially in those cells that
produce secretions)
A small region of cytoplasm
adjacent to the nucleus that
contains the centrioles and serves
to organize microtubules.
A spherical or elongated organelle in the
cytoplasm of nearly all eukaryotic cells,
containing genetic material and many
enzymes important for cell metabolism,
including those responsible for the conversion
of food to usable energy. Also called
chondriosome.