Term | Definition |
Endoplasmic Reticulum (ER) | -Double membranes that fill cytoplasm
-Rough has ribosomes (organelles that manufacture proteins) |
Mitochondrion | -Powerhouse of the cell
-Site of respiration
-Double membrane (inner have large ruffles, called cristae)
-Cristae allow more glucose to be broken down and more energy (ATP) to be released
-Has its own DNA and manufacture some of its own proteins |
Lysomes | -"Suicide sacks"
-Produced by the Golgi body
-Made of a membrane surrounding digestive enzymes
-Responsible for dissolving bacteria |
Golgi body | -Packages proteins for the cell
-Proteins go into sacs called cisternae and are then shipped out into the cytoplasm |
Nucleus | -HQ of the cell
-Controls cell activity
-Contains the nucleolus
-Manufactures ribosomes
-Ropy strands around nucleolus are chromatin, or DNA in its active form. |
Smooth Endoplasmic Reticulum (ER) | -Has little or no ribosomes
-Acts as a pathway throughout the cytoplasm
-Produces lipids |
Centriole | -Only found in animal cells
-Function in cell division |
Cell Membrane | -Regulates all that enters and leaves the cell
-Allows self recognition in multi-cellular organisms |
Organism | Anything that can live on its own |
Cell | Membrane covered structure that contains all the materials necessary for life |
Tissue | Group of cells that work together to perform a specific job |
Organ | Two or more tissues working together to perform a specific job |
Organ System | Group of organs working together (i.e. digestive, respiratory) |
Robert Hooke | Saw first cells in cork |
Anton Van Leewenhoek | First observed living cells in pond water |
Cell Theory (3 parts) | a) all organisms are composed of one or more cells
b) cell is the basic unit of life in all living things
c)all cells come from other cells |
Why are cells small? | Because the surface is not large enough to bring in enough nutrients or get rid of enough waste to keep the cell alive. Also, the inside grows faster than the outside. Inside is volume & outside is surface area |
Prokaryote | No nucleus to contain DNA
Floats around
i.e. bacteria |
Eukaryote | Has nucleus which contains DNA
i.e. animal cells |
Organelles | little organs of function |