Describe the phenotypes of the following E. coli mutants when grown in two different media: glucose only and lactose only. Explain why. (6 points) a. A strain with a mutation in the gene encoding the lacI gene; the mutant LacI protein cannot bind allolactose. b. A strain with a mutation in the gene encoding CRP; the mutant form of CRP binds but cannot release cAMP. c. A strain in which the Shine-Dalgarno sequence has been deleted from the gene encoding adenyl cyclase.

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody

What happens when two nitrogen atoms share electrons