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Domains & Kingdoms

From Bacteria to Plants - Section 3
by

Christopher Landry

on 28 September 2015

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Transcript of Domains & Kingdoms

Domains & Kingdoms
Domain Bacteria
Plants
Members of the domain Bacteria are prokaryotes.
Prokaryotes
are organisms whose cells lack a nucleus.
Members of the domain Archaea, whose name comes from the Greek word for “ancient”, can be found in some of the most extreme environments on Earth, including hot springs, very salty waters, swamps, and the intestines of cows.
Domain Archaea
Members of the domain Eukarya are eukaryotes – organisms with cells that contain nuclei. Scientists classify organisms in the domain Eukarya into one of four kingdoms: protists, fungi, plants, or animals.
Domain Eukarya
Mushrooms, molds, mildew, and yeast are all fungi. Most fungi are multicellular eukaryotes. A few, such as yeast, are unicellular eukaryotes.
Fungi
In general, plants are autotrophs and feed almost all of the heterotrophs on land.
Today, a three-domain system of classification is commonly used. The three domains are Bacteria, Archaea, and Eukarya. Within the domains are kingdoms.
Organisms are placed into domains and kingdoms based on their cell type, their ability to make food, and the number of cells in their bodies.
A
nucleus
is a dense area in a cell that contains nucleic acids – the chemical instructions that direct the cell's activities. In prokaryotes, nucleic acids are scattered throughout the cell.
Some bacteria are autotrophs, while others are heterotrophs. An
Autotroph
can produce it's own food, while a
heterotroph
cannot produce it's own food.
Scientists think that the harsh conditions in which archaea live are similar to those of ancient Earth.
Like bacteria, archaea are unicellular prokaryotes. And like bacteria, some archaea are autotrophs while others are heterotrophs.
Although bacteria and archaea are similar in some ways, there are important differences in the structures and chemical makeup of their cells.
Protists
A
protist
is any eukaryotic organisms that cannot be classified as an animal, plant, or fungus.
The protist kingdom is sometimes called the “odds and ends” kingdom because its members are so different from one another.
Some protists are autotrophs, while others are heterotrophs. Most protists are unicellular, but some, such as seaweed, are multicellular. Slime molds are protists.
Fungi are found almost everywhere on land, but only a few live in fresh water. All fungi are heterotrophs.
Most fungi feed by absorbing nutrients from dead or decaying organisms.
Plants are all multicellular eukaryotes. The Plant kingdom includes a variety of organisms.
Animals
All animals are multicellular eukaryotes. All animals are heterotrophs.
Animals have different adaptations that allow them to find food, capture it, eat it, and digest it.
Members of the animal kingdom are found in diverse environments on earth.
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