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Evolution of early life inferred from protein and ribonucleic acid sequencesThe chemical structures of ferredoxin, 5S ribosomal RNA, and c-type cytochrome sequences have been employed to construct a phylogenetic tree which connects all major photosynthesizing organisms: the three types of bacteria, blue-green algae, and chloroplasts. Anaerobic and aerobic bacteria, eukaryotic cytoplasmic components and mitochondria are also included in the phylogenetic tree. Anaerobic nonphotosynthesizing bacteria similar to Clostridium were the earliest organisms, arising more than 3.2 billion years ago. Bacterial photosynthesis evolved nearly 3.0 billion years ago, while oxygen-evolving photosynthesis, originating in the blue-green algal line, came into being about 2.0 billion years ago. The phylogenetic tree supports the symbiotic theory of the origin of eukaryotes.
Document ID
19790053967
Document Type
Conference Proceedings
Authors
Dayhoff, M. O. (National Biomedical Research Foundation; Georgetown University Washington, D.C., United States)
Schwartz, R. M. (National Biomedical Research Foundation Washington, D.C., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
LIFE SCIENCES (GENERAL)
Meeting Information
Origin of life; Second ISSOL Meeting and Fifth ICOL Meeting(Kyoto)
Funding Number(s)
CONTRACT_GRANT: NIH-RR-05681
CONTRACT_GRANT: NIH-GM-08710
CONTRACT_GRANT: NASW-3019
Distribution Limits
Public
Copyright
Other