試題詳解

複選題
12. Which statements is/are CORRECT in regard to the operon of prokaryotes?
(A) A repressor protein can bind to an operator to prevent a gene from being expressed.
(B) Polycistronic mRNA transcribed from an operon contains several coding regions.
(C) Polycistronic mRNA encode proteins that usually function in different metabolic pathways.
(D) The lac repressor acts only on a specific operon.
(E) The trp repressor can regulate more than one set of genes.