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science
science test
24
Science
6th Grade
03/26/2008

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Term
organ
Definition
when 2 or more tissues work together to preform a specific job, the group of tissues is called an organ
Term
organ system
Definition
organs work together in groups to preform particular job
Term
tissue
Definition
a group of two cells that work together to preform a specific job in the body.
Term
organism
Definition
anything that can live on its own.
Term
unicellular
Definition
a single cell that can live on its own
Term
multicellular
Definition
You are a multicellular organism. This means tht you can exist only as a group of cells and that most of your cells can survive only if they remain a part of your body.
Term
populations
Definition
a group of organisms that are of the same kind and that live in the same area.
Term
community
Definition
two or more different populations living in the same area
Term
ecosystem
Definition
the community and all of the nonliving things that affect it, such as water, soil, rocks, temperature, and light.
Term
cell membrane
Definition
all cells are surrounded by a cell membrane. This membrane acts as a barrier between the inside of the cell and the cell's environment.
Term
organelles
Definition
all cells have chemicals and structures that enable the cell to live, grow, and reproduce. These structures are called organelles.
Term
cytoplasm
Definition
the fluid that surrounds the chemicals and structures of a cell
Term
nucleus
Definition
a membrane-covered organelle that holds the cells' DNA
Term
prokaryotic
Definition
cells that do not have a nucleus, also called bacteria
Term
eukaryotic
Definition
cells that have a nucleus and are more complex than prokaryotic cells.
Term
cell wall
Definition
provides strength and support to the cell membrane (plants and algae). It is made of cellulose.
Term
ribosome
Definition
a small organelle in cells where poteins are made from amino acids.
Term
endoplasmic reticulum (ER)
Definition
a membrane covered cell organelle that produces lipids, breaks down drugs and other substances, and packages proteins for delivery out of the cell.
Term
mitochondria
Definition
cell organelles surrounded by two membranes that break down food molecules to make ATP- (the molecule that provides energy for a cell's activities)
Term
chloroplast
Definition
plants and algae have an additional kind of energy-converting organelles called a cholroplast which have two membranes and structkures that look like stacks of coins and contain an important chemical called chlorophyll.
Term
vesicle
Definition
all eukaryotic cells have membrane-covered compartments called vesicles.
Term
Golgi complex
Definition
the organelle that ships out proteins and other materials from a eukaryotic cell. The Golgi complex processes, packages, amd transports materials set to it from the ER
Term
vacuole
Definition
a very large membrane-covered chamber that stores water and other liquids in most plant cells.
Term
lysosome
Definition
special vesicles in animal cells that contain enzymes.
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