Match the following. 1. also known as archaebacteria; prokaryotic organisms with different structures than bacteria; believed to be the most primitive organisms, capable of inhabiting extreme environments
2. the two-name system of naming living things used in classification
3. prokaryotic organisms including bacteria and cyanobacteria
4. a cell that has a membrane-bound nucleus and/or organelles as its major characteristic
5. the form or appearance of an organism; the collection of physical characteristics and the structure which make up an organism; a basis for species definition
6. a cell whose nucleus is not bound by a membrane
7. the separation of populations of organisms by some type of barrier to produce variations of species; no reproduction or exchange of genes occurs between the separated groups; a basis for species definition

1. Archaea

2. Binomial nomenclature

3. Eubacteria

4. Eukaryote

5. Morphology

6. Prokaryote

7. Reproductive isolation

Explanation:

Archaea are microorganisms without a cell nucleus (i.e., prokaryotes), which were originally classified as Archaebacteria. Nowadays, procaryotic organisms are classified into two domains: Archea (Archaebacteria) and Bacteria (Eubacteria). These organisms are characterized by the lack of membrane-bound organelles. On the other hand, the domain Eukaryota consists of organisms that have their nuclei enclosed by a membrane. This domain is divided into four kingdoms: Protista, Plantae, Fungi and Animalia. Binomial nomenclature is a classification system to name species, where the first word of the name indicates the genus of the species and the second part of the name indicates the species within the genus. Finally, reproductive isolation is a term used to indicate physiological, mechanical, behavioral and geographical barriers that prevent interbreeding between two different species.

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