In E. coli, a cluster of three genes called the lac produce enzymes that break apart lactose. To the side of the genes is a region called the , where RNA polymerase binds, and another region called the , where the lac repressor binds.

Which of the following is an oxidation-reduction reaction? (pictured below)

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Donde se encuentra el adn nuclear en un organismo eucariota?