what are archaea quizlet
The Archaea (/ÉËrËkiËÉ/ or /ÉËrËkeÉªÉ/ ar-KEE-É or ar-KAY-É) constitute a domain and kingdom of single-celled microorganisms. These microbes (archaea; singular archaeon) are prokaryotes, meaning they have no cell nucleus or any other membrane-bound organelles in their cells. Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaebacteria kingdom), but this classification is outdated.