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- Domain Definition
- Domain in The Tree of Life
- The Three Domains
- Relationships Between The Three Domain Groups
- Not Included in The Three Domain System
In biology, a domain refers to the largest of all groups in the classification of life. There are currently 3 agreed groups at this level, the Archaea domain, Bacteria domain, and Eukaryadomain. Each domain contains a collection of organisms with similar properties and evolutionary histories, as scientists have organized them. It should be noted th...
In the most widely accepted theme of the organization of life, a domain is the first subdivision, as seen in the image below. A domain is then further broken up into kingdoms. In the domain Eukarya, for instance, there are four kingdoms: Animalia, Plantae, Fungi, and Protista. Each of these kingdoms is then broken down into smaller groups, all the ...
Archaea
The Archaea are a domain of bacteria-like organisms, but they have a distinct biochemistry which distinguishes them from bacteria. While they still have bacteria-like DNA and no organelles, they also have several differences which put them into a completely different domain. Their cell walls, and the RNA they produce, are significantly different from that found in the domain Bacteria. The organisms found in the domain Archaea are often extremophiles. These organisms thrive in environments whi...
Bacteria
Organisms in the domain Bacteria are also prokaryotes, having no distinguished organelles or membrane-bound nucleus. The domain Bacteria is also possibly the largest domain, containing possibly millions of unknown and unrecorded specimens. These small, single-celled organisms live almost everywhere, and are the size of most eukaryotic organelles. They contain their DNA in a small ring, and carry out all the functions of life within their single cytoplasmic space. As seen in the scanning elect...
Eukarya
The domain Eukarya represents, well, everything else. The organisms in this domain are eukaryotic, meaning they have a membrane bound nucleus and organelles. In separating different tasks of life into these membrane-bound chambers, eukaryotes are able to increase their efficiency and host a different set of chemical reactions. For instance, mitochondria are energy-transferring organelles which enable organisms in this domain to undergo aerobic respiration. This allows them to process glucose,...
Scientists are constantly debating and reorganizing the tree of life, based on new evidence. Several different theories have emerged in recent decades about the exact relationship between each domain. Two highly accepted theories can be seen in the image below. In the 1990’s Carl Woese and associates described the three domain system, which is seen...
Neither of the above approaches include viruses or prionsin the classification scheme for life. Many scientists do not consider these things to be living, as viruses hijack a cell’s machinery to replicate itself, while prions are misfolded proteins which somehow cause other proteins to fold incorrectly. Both of these genetically-based molecules hav...
- Chemistry of life. Structure of water and hydrogen bonding: Chemistry of life Elements of life: Chemistry of life Introduction to biological macromolecules: Chemistry of life.
- Cell structure and function. Cell structures and their functions: Cell structure and function Cell size: Cell structure and function Plasma membranes: Cell structure and function Membrane permeability : Cell structure and function.
- Cellular energetics. Enzyme structure and catalysis: Cellular energetics Environmental impacts on enzyme function: Cellular energetics Cellular energy: Cellular energetics.
- Cell communication and cell cycle. Cell communication: Cell communication and cell cycle Signal transduction: Cell communication and cell cycle Changes in signal transduction pathways: Cell communication and cell cycle.
In this article, I'll list all the practice tests for AP Biology that you can find online and give you a few tips on how to use them effectively as study aids for both the AP test and any in-class tests you have throughout the school year.
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Download free-response questions from past AP Biology exams, along with scoring guidelines, sample responses from exam takers, and scoring distributions.
