Which enzyme has an optimum pH that is neutral (ph 7)
Salivary amylase
Arginase
Pepsin

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.