Term
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Definition
atoms
molecules
cellular organelles
CELLS
tissues
organs
organ system
organism |
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Term
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Definition
| cluster of atoms held together by chemical bonds |
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Term
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Definition
| structure within a cell that performs a specific function |
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Term
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Definition
| simplest entity that has all the properties of life; a membrane-bounded unit containing DNA and cytoplasm |
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Term
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Definition
| a group of similar cells that carry out a particular function in an organism |
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Term
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Definition
| structures composed of more that one tissue type |
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Term
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Definition
| related organs performing a common function |
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Term
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Definition
| an individual, indipendent, living entity |
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Term
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Definition
| all organisms consist of one or more cells |
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Term
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Definition
| organisms respond to various stimuli in different ways |
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Term
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Definition
| organisms interconvert chemical molecules (metabolism) and energy released is used to grow |
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Term
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Definition
| organisms reproduce passing on traits to new generations |
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Term
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Definition
| organisms maintain relatively constant internal conditions eg pH, different from their environment |
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Term
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Definition
- All organisms are composed of cells
- The cell is the basic building block of life- chemical reactions of life take place within cells
- all cells arise by division of pre-existing cell
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Term
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Definition
Lack a nucleus
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Dna is coiled into a nucleoid region
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because no membrane surrounds the nucleoid region, the DNA is in direct contact with cytoplasm
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some prokaryotes have more than one nucleoid
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Term
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Definition
Contain a large membrane-bounded nucleus, containing DNA
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Cell is typically separated into many compartments (organells), having specialized functions
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Organisms made up of eukoryotic cells are called eukaryotes
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Term
| Prokaryotic cell features |
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Definition
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All prokaryotic cells have a plasma membrane, nucleoid, and cytoplasm containing robosomes
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Although structurally less complex than eukaryotes, some prokaryotes have specialized features:
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located outside the plasma membrane may be a cell wall (containing peptidoglycan in bacteria).
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an outer membrane may enclose the cell wall
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enclosing the cell wall and outer membrane may be a capsule
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some bacteria (cyanobacteria) carry out photosynthesis
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some prokaryotes swim using flagella
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pili (involving in mating) project from the surface of some bacteria
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Term
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Definition
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Like prokaryotes they have a plasma membrane, cytoplasm and ribosomes
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Eukaryotes contain an internal cytoskeleton which mainains cell shape and moves materials
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Eukaryotes contain membranous compartments (membrane-enclosed organelles)
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Plants possess a cell wall (mainly composed of cellulose), along with the presence of a large central Vacuole
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