Metabolism is a defining feature of all living organisms without exception. Isolated metabolic reaction in vitro are not living things but surely living reactions, comment. 

Explanation

The total sum of all living chemical sections. occuring in a living cell or organism is called metabolism. It involves formation of various molecules and many molecules get broken down. All organisms exhibit metabolism e.g., protozoans, algae, fungi, bacteria etc.
Metabolic reactions can be demonstrated outside the body in cell free systems which are neither living non-living. Isolated metabolic reactions in vitro are thus, not living things but surely living reactions. All biological reactions are highly specific selective and are enzyme catalyzed