Bio-Chemistry (M.Phil./Ph.D.) 2014 Panjab University Entrance Exam With Answers

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28.

Which of the following statements about smooth muscle contraction is correct ?

A: A Ca2+ calmodulin complex activates the phosphatase that causes contraction of smooth muscle.
B: Unlike straited muscle, contraction of smooth muscle cells occurs when Ca2+ levels fall.
C: Phosphorylation of a myosin light chain allows actin-myosin binding in smooth muscle.
D: Dephosphorylation of a myosin light chain allows actin-myosin binding in smooth muscle.

The answer is: C

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