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.
Proteins are polymers. The monomers which make up proteins are called amino acids.. Amino acids consist of an amino group (NH3), carboxyl group (COOH), a hydrogen, and an r group (any carbon chain or hydrogen). The variation in r groups allows for the diversity of amino acids, and thus the variety of proteins.