AP BIOLOGY

Detailed explanation-1: -Mitochondria originated by permanent enslavement of purple non-sulphur bacteria. These endosymbionts became organelles through the origin of complex protein-import machinery and insertion into their inner membranes of protein carriers for extracting energy for the host.

Detailed explanation-2: -The endosymbiotic theory states that mitochondria and chlopoplasts in today’s eukaryotic cells were once separate prokaryotic microbes.

Detailed explanation-3: -The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). The aerobic bacteria were initially free-living prokaryotes, before being ingested by anaerobic bacteria.

Detailed explanation-4: -Answer and Explanation: The Edosymbiotic theory describes how mitochondria and chloroplasts were once prokaryotic organisms. These prokaryotic organisms were engulfed and taken into another organism, forming a symbiotic relationship resulting in the current eukaryotic cell.