Group of similar cells and their products that carry out a specific function
Tissue
Smallest unit that can perform all life processes
Cell
Maintenance of a constant internal state in a changing environment
Homeostasis
Region of a cell within plasma membrane and includes the fluid, the cytoskeleton and all the organelles except nucleus
cytoplasm
Groups of tissue that perform a particular job in an organism
Organ
Microscopic single-cells organism that has neither a distinct nucleus with a membrane nor other specialized organelles
Prokaryote
Well defined, intracellular bodies that perform specific functions for the cell
Organelles
Largest and most visible organelle that stores DNA
Nucleus
Covers a cell’s surface and acts as a barrier between inside and outside of a cell
Plasma membrane
Nucleus is covered by a double membrane is called ?
Nuclear envelope
3 principles of cell theory
- All living things are composed of one or more cells.
- Cells are the basic units of structure and function in an organism.
- Cells come only from the reproduction of other cells.
All living things share these 8 basic characteristics
- Organized parts
- Obtain energy from their surroundings
- Perform chemical reactions
- Change with time
- Respond to their environment
- Reproduce
- Homeostasis
- Share a common history
Group of organs that accomplished related tasks
Organ system
Organisms made up of one or more cells that have nucleus and membrane-branded organelles
Eukaryotes
Helped biologists clarify our definition of life. Helped view first cells.
Microscope
Size of a cell is limited by the relationship of the cell’s outer surface area to volume
Surface area to volume ratio
