Definition of CITIZEN for Kids. 1. 2. : a person who legally belongs to, gives allegiance to, and has the rights and protections of a country.itizen is preferred for one owing allegiance to a state in which sovereign power is retained by the people and sharing in the political rights of those people. subject implies allegiance to a personal sovereign such as a monarch.
Search form. PBF Energy (âPBFâ) is one of the largest independent petroleum refiners and suppliers of unbranded transportation fuels, heating oil, petrochemical feedstocks, lubricants and other petroleum products in the United States. Read more.
Phosphofructokinase (PFK) Exercise. Learning Objectives. In this exercise, you will use StarBiochem, a protein 3D viewer, to explore the structure and function of the. enzyme phosphofructokinase (PFK). Background. Living organisms, both unicellular and multicellular, require energy to live and function.