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QUESTION 43 Organization of Skeletal Muscle 4 The A-bands of the sarcomere represent areas of a. thin filaments b. thick filaments c. thin and thick filaments d. filament attachment

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Exercise 2 The DNA is a very long molecule which is composed of two complementary banks binding to each other by hydrogen bonds. Two pairs of nitrogenous bases make these hydrogen bonds, the first pair is composed of guanine and cytosine, the second pairs is composed of the thymine and the adenine. The RNA is another nucleic acid which is usually composed of a simple bank molecule; it is shorter and has instead of the thymine, a nitrogenous base Uracil. The nucleic acid can be separate DNA by the centrifugation based on the density of the molecules which is higher in DNA after this RNA of separation is subjected to another method of separation which indicates the presence in the cell of three kinds of RNA. a- Compare basing on the text the DNA and the RNA. b- In your opinion, which of the molecules of DNA and RNA has more raised density? justify. Second letter A UUU Uuc) UUA) UUG Leu CUU UCU UGU UAU) UAC Ty UAA Stop UAG Stop Phe UGC Cys UGA Stop UCC UCA UCG UGG Trp G CCU CAU) CAC His…

Question 11 In a resting muscle, the active site on G-actin is blocked by which part of the muscle fiber? myosin O troponin nebulin o tropomyosin

QUESTION 16 If the concentration of calcium ion (Ca2*) in the cytosol of a skeletal muscle cell is low, then troponin covers the actin binding sites on the thick filament troponin holds the myosin light chains in a strained conformation tropomyosin prevents the cross-bridges from being energized tropomyosin covers the myosin binding sites on the thin filament