Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?

A. nitrogen
B. oxygen
C. carbon
D. hydrogen
E. sulfur


Answer: C

Biology & Microbiology

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Hair cells in the vertebrate ear are responsible for transducing sound pressure waves. Ion channels in the hair cell membrane open when _____

A) a chemical ligand binds to the ion channel B) light is absorbed by a molecule in the membrane C) the cell membrane reaches a threshold voltage D) the membrane is distorted mechanically

Biology & Microbiology

Each of the following citric acid cycle enzymes is subject to allosteric regulation except

A) isocitrate dehydrogenase. B) ?-ketoglutarate dehydrogenase. C) malate dehydrogenase. D) fumarate hydratase. E) pyruvate dehydrogenase.

Biology & Microbiology

What are ion pumps

What will be an ideal response?

Biology & Microbiology

Who observed that species of organisms on different islands were clearly similar, yet had distinct differences?

What will be an ideal response?

Biology & Microbiology