Alex Woese
Storyboard Text
- This is Carl Woese. He was a microbiologist, it is the study of microscopic life forms and processes; the growth, interactions and characteristics of microscopic organisms such as bacteria, algae, fungi, and some types of parasites and their vectors.https://en.wikipedia.org/wiki/Microbiologist
- You might be wondering "how DID he classify organism and what method DID he use?".
- Hmm...How can I classify these organisms?
- Well using the RNA fingerprinting, he began to sequence the fragments of 16s ribosomal RNA from every microorganism he could find. This method was developed by Fred Sanger who was a British biochemist. This method involves separating fragments of RNA in an electric field according to their nucleotide compositions.https://www.nature.com/articles/493610a
- Ribosomal RNA!!
- This is now the part where Carl Woese realized that there are different domains of the living systems. Originally from the tree of life, included two domains, prokaryotic and eukaryotic , until Carl Woese disproved this hypothesis through the use of ribosomal RNAhttp://www.nasonline.org/member-directory/deceased-members/8899.html#:~:text=July%2015%2C%201928%20%2D%20December%2030%2C%202012text=Carl%20Woese%20was%20a%20microbiologist,of%20ribosomal%20RNA%20(rRNA).
- Some lack a definite or organized nucleus, some have their nucleus functioning. Some have cell walls and other organelles. Last one is a single -celled prokaryotes organism.
- Wow..This is interesting these prokaryotes seems to have different structures
- Because of Carl Woese the ribosomal RNA, has become the standard approach used to identify and classify all organisms. Other scientists have done classifying organisms by observing their physical traits, while Woese looked for evolutionary relationships by comparing genetic sequences. https://www.igb.illinois.edu/people/archaeahttps://news.illinois.edu/view/6367/204914
- 3 domains of Life:EukaryaArchaeaBacteria
- These domains or the 3 primary divisions of the living systems are Eukarya, Archaea, and Bacteria.
- So that means there are actually domains of life, but specifically 3 to be exact.
- Bacteria is a member of a large group of mostly free-living organisms consisting of one biological cell or unicellular microorganisms which have cell walls but lack other organelles and a nucleus.https://en.wikipedia.org/wiki/Bacteria
- Archaea is an any group of a single-celled organisms that lacks a defined nuclues and are therefore prokaryotes.https://en.wikipedia.org/wiki/Archaea
- Eukarya are cells that contains a nucleus and other organelles. There are also enclosed by a plasma membrane. Examples of eukaryotes are animal, plant, fungal, and protist cells.https://en.wikipedia.org/wiki/Eukaryote
- Let's see here
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