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Life and Cells
BJU 7th grade Life Science
35
Science
7th Grade
10/18/2010

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Term
Organism
Definition

 

 

a complete living thing

 

Organisims must have

 

--life spans

--can reproduce

--grows

--are made of cells

Term
cell
Definition
a tiny unit of living material surrounded by a thin membrane
Term
cytoplasm
Definition
the  material inside a cell
Term
tissue
Definition
a group of similar cells working together
Term
colonial organism
Definition
many cells that live together but can live alone
Term
energy
Definition
the ability to do work
Term
physical life
Definition
a complex organization of nonliving substances that  is kept alive by using energy
Term
cell theory
Definition

all cells come from pre-existing cells

Term
carbohydrates
Definition
are sugars and starches
Term
molecules
Definition
are.....THE SMAllest structure in a cell ...........................molecules are made of atoms
Term
diffusion
Definition
is the movement of substances from a area of high concentration to a area of low concentration.
Term
passive transport
Definition
is the movement of substances through a membrane without the use of the cells own energy. active transport requires the cell to use its own energy
Term
osmosis
Definition
is the diffusion of water through a selectively permeable.
Term
Membrane
Definition
is the thin covering that all cells have.
Term
the fluid mosaic model
Definition
is the most accurate membrane model.
Term
Unicellular Organism
Definition
a living thing composed entirely of one cell
Term
Multicellular Organism
Definition
a living thing composed of more than one cell and whose individual cells can't live apart from the organism
Term
Protein
Definition
a substance made of long chains of amino acids
Term
Nucleic Acid
Definition
molecule that contains the genetic information of a cell. DNA & RNA are the main types.
Term
Lipid
Definition
a substance such as fat or oil
Term
selectively permeable
Definition
allowing only certain molecules to pass through
Term
active transport
Definition
the passage of particles through a membrane requiring the use of the cellular energy
Term
cell wall
Definition
a rigid structure manufactured by certain organisms and secreted to the exterior of the cell
Term
Organelle
Definition
the parts of the cell that perform many of the functions needed to keep the cell alive
Term
Mitochondria
Definition
the cellular organelles in which aerobic respiration occurs to release usable energy from food
Term
Endoplasmic Reticulum
Definition
a cellular organelle consisting of a network of membranes that enables substances to be transported throughout the cell
Term
Ribosomes
Definition
a cellular organelle that directs the assembling of proteins
Term
Golgi Apparatus
Definition
a cellular organelle that collects chemicals from the cytoplasm, processes them and secretes them
Term
Lysosome
Definition
an organelle that contains digestive enzymes
Term
Chloroplast
Definition
a cellular organelle that contains chlorophyll and other pigments. The organelle in which photosynthesis occurs.
Term
Cilia
Definition
short, hair-like extensions from a cell membrane which aid in movement
Term
Flagella
Definition
Long, hair-like extensions from a cell membrane which aid in movement
Term
Nucleus
Definition
the cellular organelle that contains the chromosomes, the control center of the cell
Term
Chromosomes
Definition
a strand of DNA with associated proteins, usually found in the nucleus of the cell, the basis of heredity
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