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7th Grade Science-What is Life?
Danville Middle School
39
Science
7th Grade
09/11/2011

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Term
Organism
Definition
A living thing
Term
Cell
Definition
The basic unit of structure and function in living things
Term
Unicellular
Definition
A type of organism that is made up of a single cell
Term
Multicellular
Definition
A type of organism that is made up into many cells
Term
Simlus
Definition
A change in an organisms surroundings that causes the organisms to react
Term
Response
Definition
An action of change in behavior that occurs as a result of a stimulous
Term
Spontaneous Generation
Definition
The mistaken idea that the living things arise from nonliving sources
Term
Autotroph
Definition
An organism that makes it's own food
Term
Cytoplasm
Definition
Living material of the cell found inside the cell membrane
Term
Heterotroph
Definition
An organism that cannot make it's own food
Term
Homeostasis
Definition
A process by which an organism's internal environment is kept stable in spite of changes int he external environment
Term
Magnification
Definition
The ability to make things look bigger than they are
Term
Resolution
Definition
The ability to clearly distinguish the individual parts of an object
Term
Cell Wall
Definition
Tough rigid layer that surrounds plant cells
Term
Cell Membrane
Definition
Flexible structure that forms the outer covering of a cell, controls movement of materials in and out of cell
Term
Nucleus
Definition
Control center of the cell. The structure that directs all the activities of the cell.
Term
Chromatin
Definition
Combination of DNA and proteins that make up the contents of the nucleous of a cell
Term
Eukaryote
Definition
An organism whose cells contain complex structures enclosed within membranes
Term
Mitochondria
Definition
Power plants of a cell which release energy needed for cell activities.
Term
Ribosome
Definition
Where proteins are made
Term
Edoplasimic Reticulum (ER)
Definition
Series of folded membranes in which materials can be processed and moved around the cell; Smooth: Without ribosomes & Rough: With ribosomes
Term
Golgi Body
Definition
Organelles that sort and package cellular materials and transport them within the cell or out of the cell
Term
Chloroplasts
Definition
Small structures that contain chlorophyll, a green pigment that allows PLANTS to make their own food.
Term
Vacuole
Definition
Place where cells store water, food and other materials (Size is small in animals, large in plants)
Term
Lybosome
Definition
Cells garbage disposal system
Term
Prokaryote
Definition
Goupd of organisms that lack a cell nucleus or any other membrane bound organelles
Term
Anton Van Leeuwenhoek
Definition
Dutch Scientist who was the first scientist to see single celled organisms that are called bacteria
Term
Six important characteristics that all living things have in common
Definition
Cellular organizations, contains similar chimicals, used engergy, grow and develop, respond to surroundings
Term
What are the four things that all organisms need to survive
Definition
Food, Water, Shelter, Oxygen
Term
Ribosome
Definition
Structures that produce proteins
Term
Mitochondria
Definition
Structures that produce most of the cells energy
Term
Chlorophyll
Definition
Gives plant's it's green color
Term
What function does Chlorophyll give to plants?
Definition
Gives plants it's green pigment
Term
What organelle allows structures to pass in and out of the cell?
Definition
Cell Membrane
Term
What is the process of becoming larger called?
Definition
Growth and development
Term
What are the major gases on Earth today? And What % of each?
Definition
Co2-1%, Argon-1%, H2o-1%, Co-1%, 03-1%, O2-21%, Nitrogen-78%,
Term
What scientis was one of the first people to observe cells by susing a thin slice of cork?
Definition
Robert Hooke
Term
Describe Redi and Pasteur's experiements that helped disprove spontaneious generation
Definition
Life doesnt always come from life
Term
Three Main ideas of the cell theory
Definition
1. All living things are made of one or more cells.
2. The cell is the basic unit of life in which the activities of life occur.
3. All cells come from cells that already exist
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