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.
The sidechain R is a combination of atoms that is different for every amino acid. Credit: Wikimedia Commons. Only 20 standard amino acids are used to build proteins, but why exactly nature chose these particular amino acids is still a mystery.One step towards solving this is to explore the âamino acid spaceâ, the set of possible or hypothetical amino acids that might have been used instead.he sidechain R is a combination of atoms that is different for every amino acid. Credit: Wikimedia Commons. Only 20 standard amino acids are used to build proteins, but why exactly nature chose these particular amino acids is still a mystery.