Biocatalyst immobilised enzyme systems

In multiphase systems, biological reactions are always carried out in the presence of water. This is true even if the presence of water is almost negligible. The biocatalyst maybe present as a solid phase, for example as immobilised enzymes or cells, or as an individual cell the substrate may also constitute a solid phase. When necessary, gas is sparged into reactors to supply oxygen or a gaseous substrate and to remove carbon dioxide. Thus, heterogeneous systems with four phases involved are very typical cases. 

Identify which of the following statements are true for immobilised biocatalysts, when compared to free enzyme or free cell systems. 

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