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BIO 1A3/5.1

Cellular and Ecological Levels of Organization

TermDefinition
Element The most basic units of molecules
Molecule A collection of elements that are bonded together
Macromolecule Large molecules that perform a function in living organisms
Organelle Specialized structures that perform important functions within cells
Cell The smallest unit of life
Tissue A collection of cells that works together to perform a specified function
Organ A specialized structure made of tissue that performs a specific function.
Organ System A specialized system within a living organism made up of organs that perform a unified function
Organism A single living individual
Population All individuals of a single species that live in an area
Community All of the different species within a specific area
Ecosystem All living organisms and nonliving matter within a specific area
Biome Groups of ecosystems that have the same climate and similar dominant communities
Biosphere Parts of the Earth where life exists
Element Carbon (C), hydrogen (H), oxygen (O), sodium (Na)
Molecule Water (H2O), carbon dioxide (CO2), table salt (NaCl)
Macromolecule Carbohydrates, proteins, DNA, lipids
Organelle Nucleus, ribosomes, golgi body, smooth ER
Cell Skin cell, muscle cell, bacteria, plant cell, protist
Tissue Blood is composed of leukocytes and erythrocytes.
Organ A muscle, stomach, brain, lung, bone
Organ System Circulatory, respiratory, and digestive are examples
Organism The human body, A blue jay
Population A group of humans, All the oak trees in a forest
Community All the bacteria, fungi, plants, and animals in a forest
Ecosystem All the living things in a forest plus a river and rocks
Biome Tundra, rainforest, temperate forest
Biosphere All bacteria, fungi, plant, and animal life in all the ecosystems on Earth
Created by: M. Clay
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