35. In 2018, an organization carried out a global survey into the attitudes of people towards vaccines. Vaccines provide artificial active immunity. Which of the following is not a correct statement about how a vaccine results in active immunity? (A) A vaccine results in active immunity by that Vaccine contains an inactive/attenuated form of the pathogen / virus / bacteria /microorganism. (B) Macrophages engulf and display the antigen on their cell surface. (C) Macrophages will present the antigen to T helper cells. (D) T helper cells will activate B/T killer cells. (E) The vaccine provides ready-made antibodies that immediately neutralize the pathogen.

13. Suppose a person begins breathing very rapidly while resting (hyperventilating), which of the following best describes how homeostasis is restored? (A) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The frontal cortex detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (B) Rapid breathing increases blood CO2 levels, thereby causing the blood pH to drop. The hypothalamus detects the change and decreases stimulation of the rib muscles and the diaphragm, thereby reducing the breathing rate. (C) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The hypothalamus detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (D) Rapid breathing increases blood CO2 levels, thereby causing the blood pH to drop. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate. (E) Rapid breathing decreases blood CO2 levels, thereby raising blood pH. The medulla oblongata detects the change and reduces stimulation of the rib muscles and the diaphragm, thereby decreasing the breathing rate.

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