Master service agreement. [hide]This article has multiple issues. Please help improve it or discuss these issues on the talk page. This article needs more links to other articles to help integrate it into the encyclopedia. Please help improve this article by adding links that are relevant to the context within the existing text.
#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
The three-domain system of classification groups organisms into the following 3 categories: Bacteria Archaea/archaeabacteria Eukarya Bacteria and Archaebacteria are both include unicellular prokaryotes but there are differences between in their genetic material and proteins.