Allosteric protein
Allosteric protein can be defined as a protein with a
multiple ligand- binding site that changes from one folding conformation to a
different shape when another molecules binds to it. However, the conformational
changes alter the properties or activities of the protein.
Answer:

aka Ethenone
Explanation:
Ethenone is an organic compound made out of the elements Carbon, Hydrogen, and Oxygen. It is an example of a covalent molecule. The Hydrogens are single bonded to the carbon and then the carbons and oxygen are double-bonded to each other. Additionally, because there are 2 Hydrogens and 1 Oxygen the ratio is 2:1, as stated in the question.
Explanation:
Kingdom 4 because it consists all features of plantar.