The thyroid glands secrete calcitonin.
a. true
b. false
Answer: a. true
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Cats have no digestive enzymes in their mouths.
a. true b. false
How do biologists define "life"?
What will be an ideal response?
The technique called radiometric dating is based on
A) the steady, clocklike decay of certain radioactive isotopes over time. B) the assumption that radioactive isotopes accumulate in fossils at a constant rate. C) the formation of radioactive molecules in rocks after they are deposited. D) the use of fossils of known age to determine how fast carbon-14 decays.
How is phosphorylation important in a signal transduction cascade?
-Phosphorylation will shut down a signal transduction cascade, thus leading to an end of the signal. -A hormone will phosphorylate the entire cell, thus causing the cell to be marked for destruction. -Phosphorylation will turn an inactive protein into an active one, which triggers another response in the cell. -When the hormone itself becomes phosphorylated, it travels to all nearby cells and activates them to release more hormones of that same type.