試題詳解

複選題
30.Which of the following is (are) the CORRECT description of an operon?
(A) An enhancer that positively regulates gene expression.
(B)A single operon usually contains all the enzymes that are specific for the synthesis of a special biomolecule.
(C) A silencer that negatively regulates gene expression.
(D) It occurs in both prokaryotes and eukaryotes.
(E) A group of genes under the control of a common promoter.