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
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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
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.
What are ion pumps
What will be an ideal response?
Who observed that species of organisms on different islands were clearly similar, yet had distinct differences?
What will be an ideal response?