How might economic activities within a family with adults, teenagers, and young children represent aspects of the tradition, command, and market economies?

Adults in a family control the money, much as the wealthy control capital in the larger economy as a whole. The children are dependent upon them, just as workers are dependent upon capitalists to provide jobs through investment.

The enzyme’s active site binds to the substrate. Since enzymes are proteins, this site is composed of a unique combination of amino acid residues (side chains or R groups). Each amino acid residue can be large or small; weakly acidic or basic; hydrophilic or hydrophobic; and positively-charged, negatively-charged, or neutral. The positions, sequences, structures, and properties of these residues create a very specific chemical environment within the active site. A specific chemical substrate matches this site like a jigsaw puzzle piece and makes the enzyme specific to its substrate.