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IB Biology - Unit 1 - Cell Biology

Terms in this set (55)

Cell Theory
The theory that cells form the fundamental structural and functional units of all living organisms
Unicellular
A single celled organism
Multicellular
Made up of more than one cell.
Prokaryotic
A small single cell lacking a nucleus or any other membrane-bound organelles. Bacterial cells are an example
Eukaryotic
A cell characterized by the presence of a nucleus and other membrane-bound organelles. Eukaryotes can be unicellular (protists) or multicellular (fungi, plants and animals).
Microscope
An instrument with lenses and light that is used to observe objects too small to be visible with only the eyes.
Magnification
Make appear larger than it is, especially with a lens or microscope.
Resolution
Ability of a microscope to distinguish two objects as separate
Virus
Ultramicroscopic infectious agent that replicates itself only within cells of living hosts
Differentiation
Cells develop different forms adapted to specific functions
Emergent
Characteristic that appears as the complexity of life increases, once the minor parts are assembled. For example when the brain is functioning you experience thoughts and memories. Thoughts and memories are the emergent properties
Stem Cell
Cells that divide and remain undifferentiated. Three types are totipotent, pluripotent, and multi-potent.
Ultrastructure
The detailed structure of the internal components of cells as revealed by the electron microscope rather than by the light microscope.
Binary Fission
A form of asexual reproduction in single-celled organisms by which one cell divides into two cells of the same size
Cell Wall
A rigid structure made of cellulose that surrounds the cell membrane and provides support to the cell
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