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.
There are twenty common amino acids (examples are alanine, tryptophan, methionine and valine). They all consist of a central carbon atom linked to an R group (also called a side chain), a hydrogen atom, an amino (NH2) group and a carboxylic acid (COOH) group.The different amino acids (like the 4 examples above) differ in the structure of their R groups. Glycine's R group is a single H atom.Phenylalanine's R group differs from alanine's R group by a phenyl group.he different amino acids (like the 4 examples above) differ in the structure of their R groups. Glycine's R group is a single H atom. Phenylalanine's R group differs from alanine's R group by a phenyl group.