What is premature ejaculation? a. the inability of a male to prolong sexual excitement long enough to complete sexual intercourse. b. the inability of the male to achieve orgasm. c. the experience of persistent genital pain before or during sexual intercourse. d. the inability of a male to achieve sexual arousal before sexual intercourse?

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.