A biological steady state:

A. maintains reactions at chemical equilibrium within the cell.
B. is maintained by adjustments in metabolic flux. is a reversible state of the system.
C. allows turnover (utilization and reproduction) of biomolecules while maintaining a constant concentration of biomolecules.
D. is reversible state system

1. all of above
2. A, B and D
3. B and D

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit. there is a precise compatibility between the active site and the lactose molecule. specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed. reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.