They say how an enzyme perfectly fits into its substrate is alike a "lock and key".
Only one specific enzyme can fit a specific substrate.
A complete protein<span> (or whole protein) is a source of protein that </span>contains<span> an adequate proportion of </span>all nine<span> of the </span>essential amino acids<span> necessary for the dietary needs of </span><span>humans.
Answer: C
Hope this Helps! :3
</span>
