[Solved] Which of the following sets of substituents are all ortho/para directing in electrophilic aromatic substitution reactions? A) Br, CH<sub>3</sub>, NO<sub>2</sub> B) CH<sub>3</sub>, NH<sub>2</sub>, Br C) Cl, OCH<sub>3</sub>, COCH<sub>3</sub> D) NO<sub>2</sub>, COCH<sub>3</sub>, COOH Molecular Biology: A branch of biology that focuses on the structure and function of the molecules that make up cells, particularly DNA, RNA, and proteins. Microbiology: The branch of science concerned with microorganisms and their effects on other living organisms. Surface Anatomy: The study of the external features of the body and their relationship to deeper structures, as visible to the naked eye without dissection. Organelle: Specialized structures within a cell, each performing specific functions necessary for the cell's life, such as mitochondria, the Golgi apparatus, and the nucleus.