Which of the following statements about molecular switches is false?
(a) phosphatases remove the phosphate from gtp on gtp-binding proteins, turning them off.
(b) protein kinases transfer the terminal phosphate from atp onto a protein.
(c) serine/threonine kinases are the most common types of protein kinase.
(d) a gtp-binding protein exchanges its bound gdp for gtp to become activated.

Match the types of competition to their descriptions.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.