42. How does the RecA protein contribute to the increased expression of SOS genes?
(A) RecA protein competes with LexA protein for binding to the operator sequences.
(B) RecA protein binds to LexA protein bound to the operator, directly lowering the affinity of LexA protein for DNA.
(C) RecA protein binds to free LexA protein, mediating the self-cleavage of the repressor.
(D) RecA protein binding to the promoter region recruits RNA polymerase.
阿摩線上測驗
登入