Multiple choice learning objective 272 define and

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Multiple Choice Learning Objective: 27.2 Define and explain the range and role of innate defence mechanisms that provide a first line of protection. Difficulty: Easy Section: Mammalian immune system
356. Award: 1.00 point Evolution of the immune system has resulted in a wide array of mechanisms of increasing complexity. Which of the following statements about the immune system is INCORRECT?
Macrophages developed late in evolution, with fully active macrophages being found only in vertebrates. References Multiple Choice Learning Objective: 27.1 Describe the reasons why organisms require an immune system. Section: Evolution of immune responses Difficulty: Medium Learning Objective: 27.2 Define and explain the range and role of innate defence mechanisms that provide a first line of protection.

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