Physiologists Are Studying the Biomolecular Mechanisms Underlying Skeletal Muscle Contraction

Physiologists are studying the biomolecular mechanisms underlying skeletal muscle contraction.  They have been analyzing muscle fibers obtained from knockout mice to determine how different cellular substances influence muscular contraction.  Striated muscle fibers obtained from a specific mouse embryo fail to contract in response to a substance normally released from the sarcoplasmic reticulum.  A deficiency of which of the following would best explain this finding?

A) Acetylcholine
B) Epinephrine
C) Calmodulin
D) Myosin light-chain kinase
E) Troponin

Correct Answer:

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