Which statement about the specific immune response is FALSE? Clonal selection creates short-lived effector cells to destroy the specific antigen. Clonal selection produces memory cells that are long-lived and can recognize the antigen in the future. O It takes about two weeks for memory cells to respond to an antigen. The maximum response from effector cells takes about two weeks after the first time the body has been exposed to an antigen. Memory cells divide to produce effector cells when they are exposed to their specific antigen.

Select the star life cycle that is accurate

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.

How does the fermentation of pyruvic acid in cells contribute to the formation of atp? a. it completes the oxidation of glucose to co2, creating atp. b. it generates lactic acid, which cycles back through the krebs cycle, producing 2 atp molecules. c. it converts fadh2 to phosphate, which bonds with adp. d. it produces 2 nad+ molecules, which cycle back to fuel the glycolysis reaction, allowing 2 atp molecules to be produced.