The thyroid glands secrete calcitonin.

a. true
b. false


Answer: a. true

Biology & Microbiology

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Cats have no digestive enzymes in their mouths.

a. true b. false

Biology & Microbiology

How do biologists define "life"?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology