Animal physiology - test HL - mark scheme

This is the mark scheme for the Animal physiology testI Attenuated microbesII Antigen molecules from a pathogenIII A harmless pathogen that challenges the immune systemA I onlyB I and II onlyC I and III onlyD All of the aboveI Myosin filamentsII The sarcomereIII The light bandIV The distance between Z linesA I and II only

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