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.
Every amino acid consists of a carbon to which an amine (-NH2) group, a carboxylic acid (-COOH) group and a hydrogen (-H) atom is attached. What makes an amino acid unique is â¦the attachment of a fourth side chain called an R group.