1. SI,
2. Number 10.
I'm pretty sure it's that, I just did something related to that.
It would be a catalyst. They help increase the rate of chemical reactions.
Proteins are polymers of amino acids. There are a fixed set of amino acids that are involved in the making of a protein. These amino acids are varied in number and type to give rise to different combinations in a polymer. This creates a diversity of protein molecules.
The amino acids link to other amino acid in the polymer through the formation of a peptide bond between them. It forms when the carboxylic group of one amino acid molecule reacts and binds to the amino group of the other molecule.
Artificial selection is when humans manually breed certain species to get a different trait, whether it is size or color. The most famous occurrence of this is wolves to dogs.<span />
