In skeletal muscle, which protein is PRESENT in the I-band but ABSENT from the H-band?
a. Actin
b. Creatine kinase
c. Desmin
d. Myosin
e. Titin
ANS: A
Actin filaments form the major protein of the I-band but do not penetrate deep enough into the A-band to enter the H-band.
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Fill in the blank with the correct word.
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