Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?

A) Second messengers act through receptors called K-proteins.
B) Second messengers usually inactivate protein kinase enzymes.
C) Cyclic AMP and calcium may be second messengers.
D) Second messengers usually act to remove nitric oxide (NO) from the cell.


C) Cyclic AMP and calcium may be second messengers.

Anatomy & Physiology

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Bitter and sour tastes are generally associated with

A) Carbohydrates. B) Proteins. C) Ions. D) Toxic substances.

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In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering the cortical reaction

A) calcium ion B) ATP C) phosphate ion D) sodium ion

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Structures in the heart that carry electrical signals from the SA node to the AV node are called

A) the chordae tendineae. B) bundle branches. C) Purkinje fibers. D) internodal pathways. E) None of the answers are correct.

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Cell structures that are composed of macromolecules; fifth structure in the levels of organization in the body

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