Biological Science (6th Edition)

Published by Benjamin Cummings
ISBN 10: 0321976495
ISBN 13: 978-0-32197-649-9

Chapter 1 - Biology and the Tree of Life - Review: 5

Answer

-Predicted by the theory of evolution, all organisms are part of a lineage that can trace back to one popular ancestor. -To construct this "phylogeny', biologists examined the sequences in a range of genetic material that all cells are bound to have. -the three domains of life are the Archaea, Bacteria, and Eukaryotes.

Work Step by Step

-The theory of evolution by natural selection is pretty much how an organism(s) changes over time resulting in the hereditary behavioral or physical traits. -when constructing a "phylogeny", you pick the mist different or ancestral species to the one that shares a common ancestor with the prior species. -the three domains of life: archaea, bacteria, and eukaryotic microorganisms Bacteria -has a cell wall -sensitive to antibiotics Archaea -prokaryotic -cell wall is made of peptidoglycan (a polymer made of sugars and amino acids that form a mesh-like layer outside the plasma membrane of most bacteria. -sensitive to antibiotics -mostly circular chromosome and plasmids in DNA Eukaryotes -is Prokaryotic -Does not contain peptidoglycan - not sensitive to antibiotics -Circular chromosome and plasmids DNA
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