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Cells
Section E-1 vocabulary
28
Science
8th Grade
03/17/2010

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Term
cell
Definition
The smallest unit that is able to perform the basic functions of life
Term
genetic material
Definition
The nucleic acid DNA that is present in all living cells and contains information needed for a cell's growth, maintenance and reproduction
Term
theory
Definition
a well tested explanation that is consistent with all available evidence
Term
organism
Definition
an individual living thing, made of one or more cells, that is capable of growing and reproducing.
Term
characteristics of life
Definition
1)organization
2)ability to develop & grow
3)ability to respond to the environment
4)ability to reproduce
Term
unicellular
Definition
made of a single cell
Term
multicellular
Definition
made of many cells
Term
microscope
Definition
an instrument that makes an object look bigger than it is
Term
The cell theory
Definition
1)every living thing is made of one or more cells
2)cells carry out the functions needed to support life
3)cells come only from other living cells
Term
bacteria
Definition
unicellular (single-celled) organisms that sometimes cause disease
Term
Louis Pasteur
Definition
his experiments showed that cells come only from other cells, he developed the process that uses heat to kill bacteria. teh process is named after him and is called pasteurization
Term
cell membrane
Definition
protective covering that encloses the entire cell, anything going in or out of the cell must pass through the cell membrane
Term
cytoplasm
Definition
gelatin-like material insice the cell
Term
nucleus
Definition
struture in a cell that contains the genetic material
Term
eukaryotic cell
Definition
a cell that has a nucleus
Term
prokaryotic cell
Definition
a cell that does NOT have a nucleus, the genetic material is in the cytoplasm
Term
organelle
Definition
any part of a cell that is enclosed by a membrane
Term
cell wall
Definition
1)found in PLANT cells
tough outer covering just outside the cell membrane that protects and supports the cell
Term
chloroplast
Definition
2)only in PLANT cells
organelle in which the energy from sunlight is used to make sugar, this process is called PHOTOSYNTHESIS
Term
mitochondria
Definition
organelle that uses oxygen to get energy from processing food
Term
endoplasmic reticulum
Definition
1)transports materials in vesicles
2)contains ribosomes, which make proteins
3) makes part of the cell membrane
Term
vesicles
Definition
parts of the endoplasmic reticulum that break off and are used to transport materials to the golgi apparatus (golgi bodies)
THINK vesicle-vehicle..used to transport
Term
vacuole
Definition
1)only on PLANT and fungus cells
2)organelle used for storage
3)plants have a large central vacuole to store water and other materials
THINK in a plant cell, the central vacuole looks like a big pool of water
Term
lysosome
Definition
1)found in animal cells
2)organelle for storage of waste
3)also breaks down materials that come into the cell
Term
specialization
Definition
specific cells perform specific functions, for example a blood cell does different work in your body than a muscle cell
Term
tissue
Definition
a group of similar cells that do a specific job, for example muscle tissue is made up of a group of muscle cells
Term
organ
Definition
different tissues work together to perform a particular function,for example eyes have nerve tissue and muscle tissue
Term
organ system
Definition
different tissues and organs working together
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