Levels of Organization

Atom Smallest unit of matter Carbon, hydrogen, oxygen NON-living

Molecule 2 or more bonded atoms forming a compound Water, salt, sugar NON-living

Macromolecule Very large, complex molecules Proteins, fats, carbohydrates, nucleic acids NON-living

Organelle a cell part that performs a specific function Made of macromolecules Nucleus, mitochondria, ribosome Non-living

Cell Basic unit of structure & function in life Made of organelles Nerve cells, blood cells, stem cells LIVING

Tissue A group of similar cells that perform a certain function muscle, fat, tendons, bone, hair Living

Organ A body part composed of various tissues that performs a certain function Examples: lungs, heart, eye, kidney Living

Organ System A group of organs that work as a team to complete specific functions Example: brain + nerves + eyes + etc = nervous system Living

Something that has all 6 characteristics of life Organism Something that has all 6 characteristics of life Usually made of systems May be a single cell Plants, animals, bacteria Living

Levels of Organization in a Human

Levels of Organization in a Plant