Which branch of chemistry is most concerned with reactions taking place within living cells?
Biochemistry
Biochemistry is the branch of chemistry that studies the chemical substances and chemical processes that occur inside living cells and organisms — enzymes, proteins, carbohydrates, lipids, nucleic acids, metabolism, respiration and so on. It is the meeting point of biology and chemistry.
Inorganic chemistry mainly deals with compounds that do not contain carbon-hydrogen bonds, such as metals, minerals and coordination compounds. Analytical chemistry focuses on identifying substances and measuring how much of each is present in a sample. Physical chemistry deals with the physical principles behind chemical behaviour, such as thermodynamics, kinetics and quantum chemistry. None of these three has cell reactions as its main concern.
Hence, the answer is Biochemistry.
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