Test: GRE Subject Test: Biochemistry, Cell, and Molecular Biology

1.

Which of the following is true regarding muscle cell specialization?

I. Contraction is controlled by the presence or absence of calcium ions

II. Actin filaments are known as the "thick" filaments

III. Contraction is an ATP-independent process

IV. The basic functional unit of muscle contraction is called the sarcoplasmic reticulum

I only

II, III, and IV

II and III

I, III, and IV

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