‘Noble gases’ are least reactive as their outer shells are fully filled with electrons. These do need to share their electrons from outer shells with other elements .
I believe that you are supposed to notice that the striations in the contracted muscle fibers are much closer together than the striations in the uncontracted muscle. Therefore, it would appear that somehow the striated parts of the muscle are being pulled closer together somehow. Glycerinated muscle retains the organized structural array of myosin thick filaments and actin thin filaments, actin associated proteins like troponin and tropomyosin which regulate contraction, and the functional capacity for contraction.
Both genes need to be recessive in order for a recessive trait to be expressed.
I hope this helps!