Membrane proteins are among the most important proteins biologically because they allow the cells to communicate with their environments. these membrane proteins are responsible for all but which process?
a) triggering ion channels
b) identifying foreign cells
c) regulating intake of oxygen
d) activating growth hormone reactions

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Prompt compare the three types of volcanic mountains in terms of shape, type of eruption, and the minerals that make up the volcano

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.