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.
An amino acid contains an amino group, a carboxyl group, and an R group, and it combines with other amino acids to form polypeptide chains. Learning Objective. Describe the structure of an amino acid and the features that confer its specific properties.