Classification of Organisms Quiz

Study Notes

Classification of Organisms

Organisms are categorized using a three-domain system: Bacteria, Archaea, and Eukarya.
Classification is based on cell type, method of obtaining food, and number of cells.

Domain Bacteria

Bacteria inhabit diverse environments.
Autotrophic and heterotrophic forms exist.
All bacteria are unicellular prokaryotes.

Prokaryotes

Prokaryotes are unicellular organisms lacking a nucleus.
Nucleic acids are not contained within any membrane-bound structure.

Nucleus

The nucleus is a dense area within cells that holds nucleic acids, directing cell activity.

Domain Archaea

Archaea thrive in extreme environments, such as hot springs, ocean floors, and volcanic regions.
They are also unicellular prokaryotes, varying between autotrophs and heterotrophs.
Distinct from bacteria due to differences in chemical composition and cell structure.

Domain Eukarya

Organisms in Eukarya are classified into four kingdoms: protists, fungi, plants, and animals.

Eukaryotes

Eukaryotes possess cells that contain a nucleus.

Kingdom Protists

Protists are diverse eukaryotic organisms not fitting into fungi, plants, or animals.
Commonly referred to as the "odds and ends" kingdom due to their variability.
Members can be autotrophic or heterotrophic and include both unicellular and multicellular forms.

Kingdom Fungi

Fungi encompass organisms like mushrooms, molds, and mildew.
They can be unicellular or multicellular and are all heterotrophic.
Nutrients are absorbed from dead and decaying organisms.

Kingdom Plants

All plants are multicellular and autotrophic, producing their own food.
They provide essential food sources for various terrestrial heterotrophs.
Plant diversity includes variations in height and whether they produce flowers.

Kingdom Animals

All animals are multicellular and heterotrophic.
Animals display various adaptations for locating, capturing, consuming, and digesting food.
They inhabit numerous environments, showcasing ecological diversity.

Description

Test your knowledge on the three-domain system of classification for organisms. This quiz covers Bacteria, Archaea, and Eukarya, focusing on their characteristics and differences. Perfect for biology students seeking to strengthen their understanding of prokaryotes and eukaryotes.