Which cell junction (not shown) allows direct passage from one cell's cytoplasm to the next?

The gas nitric oxide has been identified as a signaling molecule. Which of the following mechanisms of action would you expect from a gaseous molecule? a) It binds to a G-protein-linked receptor. b) It binds to a receptor tyrosine kinase.

would sound travel faster in a thick piece of metal (high density) or a large hallow piece of metal (low density) ? explain why.

Which practice can result in increased soil erosion? a. shelterwood harvest b. clear-cutting c. thinning d. crop rotation

When true breeding brown dogs are mated with certain true breeding white dogs, all of the F1 pups are white. The F2 progeny from some F1 x F1 crosses were 118 white, 32 black, and 10 brown pups. What is the genetic basis for these results?

The hormone that signals your cells to remove sugar from the bloodstream is A. insulin. B. glucose. C. diabetes. D. the pancreas.

A structure on a cell that binds with something, like a hormone is called a (n) A. catalyst B. protein C. receptor D. axon

Which statement is true? A. Lipids are a type of fat. B. Fats are a type of lipid. C. Fats and lipids are separate and unrelated substances. D. All lipids are fats, and all fats are lipids.

What is the difference between a car and a human being?

In a hypotonic solution, an animal cell will?

Which fossil organism in whale evolution do you think was the first to live mostly in water?