The type of enzyme that are
synthesized in an environment where an operon codes for enzymes that synthesize
a protein from precursor amino acid molecules are the repressible enzymes. It binds
to the operator and blocks attachment of RNA polymerase to the promoter,
preventing transcription of the genes.
The answer is "At least 15".
C. Grapefruit juice with a pH of 3.0 because numbers less than 7 are more acidic.