How did the formation of the ozone layer contribute to existence of life on earth

Where would the lac repressor be bound in a (nonmutant) e. coli cell that is growing in low glucose and high lactose? (i = lac repressor gene; z, y, a = lac operon structural genes; p = lac promoter; o = lac operator) ?

Which statement best describes the green house effect

Viruses and bacteria are both microscopic and can both cause disease. viruses differ from bacteria in that all viruses * a. have cell walls. b. can be destroyed by antibiotics. c. need a living host cell to reproduce.

A 4-year-old male child has several small pustules with honey-colored crusted drainage on his face, but in no other location. the child is diagnosed with impetigo. the most appropriate treatment would be:

Why might a very high-fiber diet be harmful for malnourished people, the elderly, and young vegan children? a. low fluid intakes among these groups increase risk of intestinal blockage. b. risk of heart disease is higher among these group. c.

Which population would increase most if the insects were eliminated

What mineral is used as a coating for steel?

How do earthquakes at divergent plate boundaries differ from those at convergent plate boundaries? Earthquakes at divergent boundaries are deeper and more severe. Earthquakes at divergent boundaries are almost always larger.

Salvador would like to take a paternity test to determine if he is Pilar's father. He asks Pilar's mother, Antonia, to provide DNA samples for both her and Pilar. Which technique will most likely be used to compare the three DNA samples?

What is not a a form of passive transport