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17 Which one of the following statements concerning Ca2+ is correct? A. Intracellular concentration of Ca2+...

17 Which one of the following statements concerning Ca2+ is correct?

A. Intracellular concentration of Ca2+ is higher than that of the extracellular fluid.

B. The concentration of cytosolic Ca2+ is transiently decreased by activation of phospholipase C.

C. The effects of Ca2+ are most often mediated by calmodulin.

D. Ca2+ opposes the action of diacylglycerol on protein kinase C.

E. Intracellular Ca2+ is mostly free.

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Answer #1

17 Which one of the following statements concerning Ca2+ is correct?

A. Intracellular concentration of Ca2+ is higher than that of the extracellular fluid.

false

B. The concentration of cytosolic Ca2+ is transiently decreased by activation of phospholipase C.

True, as stated before, the cytosolic Ca+2 is decreased by phospholipase C.

C. The effects of Ca2+ are most often mediated by calmodulin.

False

D. Ca2+ opposes the action of diacylglycerol on protein kinase C.

False, as stated in B

E. Intracellular Ca2+ is mostly free.

it is not free, it is mainly attached to enzymes or other proteins

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