The average estimated cash rent was $202 per acre on top quality land, $161 per acre on average quality land, and $124 per acre on poor quality land. This was an increase in rental rates of 2.0% for top quality land, 1.9% for average quality land, and 2.5% for poor quality land.
R-Group. In solution it is the nature of the amino acid R-groups that dictate structure-function relationships of peptides and proteins.
primary structure, secondary structure, tertiary structure, quaternary structure, a-helix, b-pleated sheet, amino acids, peptide bond. Protein Primary Structure. Proteins are polymers of amino acids. Each amino acid has the same fundamental structure, differing only in the side-chain, designated the R-group.The carbon atom to which the amino group, carboxyl group, and side chain (R-group) are attached is the alpha carbon (C).rotein Primary Structure. Proteins are polymers of amino acids. Each amino acid has the same fundamental structure, differing only in the side-chain, designated the R-group. The carbon atom to which the amino group, carboxyl group, and side chain (R-group) are attached is the alpha carbon (C).