Show Summary Details

p. 11. Originslocked

  • Sebastian G.B. Amyes

Abstract

‘Origins’ considers how bacteria, single-celled organisms known as prokaryotic cells, first emerged approximately 3.5 billion years ago, developing from a common ancestor of prokaryotic and eukaryotic cells. Bacteria, like all cells, contain DNA and they function by the decoding of this DNA into proteins, which comprise the enzymes that control all the major ogranism processes. The first bacteria were anaerobic, then photosynthetic bacteria and cyanobacteria emerged creating oxygen allowing the development of aerobic bacteria, which then flourished about 2.5 billion years ago. The two classes of bacteria — Gram-positive and Gram-negative — are discussed along with the differences between a bacterial cell and a eukaryotic cell.

Access to the complete content on Very Short Introductions online requires a subscription or purchase. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.