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30
Science
8th Grade
05/25/2012

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Term
unicellular
Definition
Characterized by the formation or presence of a single cell or cells.
Term
multicellular
Definition
consisting of many cells; "multicellular organisms"
Term
microscope
Definition
An optical instrument used for viewing very small objects, typically magnified several hundred times.
Term
cell membrane
Definition
The semipermeable membrane surrounding the cytoplasm of a cell.
Term
cytoplasm
Definition
The material or protoplasm within a living cell, excluding the nucleus
Term
nucleus
Definition
The central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Term
organelle
Definition
Any of a number of organized or specialized structures within a living cell.
Term
cell wall
Definition
A rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher...
Term
chloroplast
Definition
A plastid that contains chlorophyll and in which photosynthesis takes place.
Term
mitochondria
Definition
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
Term
vacuole
Definition
A space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
Term
endoplasmic
Definition
the inner portion of the cytoplasm of a cell
Term
ribosomes
Definition
A minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells.
Term
golgi apparatus
Definition
A complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transp
Term
lysosome
Definition
An organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a memb
Term
eukaryotic cell
Definition
A eukaryote (or) is an organism whose cells contain complex structures enclosed within membranes. The defining membrane-bound structure...
Term
prokaryotic cell
Definition
The prokaryotes (or) are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound organelles. They differ...
Term
specialization
Definition
the act of specializing; making something suitable for a special purpose.
Term
tissue
Definition
Any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products
Term
organ
Definition
A smaller instrument without pipes, producing similar sounds electronically.
Term
chemical energy
Definition
that part of the energy in a substance that can be released by a chemical reaction.
Term
glucose
Definition
A simple sugar, C6H12O6, that is an important energy source in living organisms and is a component of...
Term
photosynthesis
Definition
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water
Term
chlorophyll
Definition
A green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy
Term
cellular respiration
Definition
the metabolic processes whereby certain organisms obtain energy from organic molecules
Term
diffusion
Definition
The action of spreading the light from a light source evenly so as to reduce glare and harsh shadow
Term
passive transport
Definition
transport of a substance across a cell membrane by diffusion;
Term
osmosis
Definition
The tendency of molecules of a solvent to pass through a semipermeable membrane from a less concentrated solution
Term
active transport
Definition
Term
DNA
Definition
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