Which statement best describes how channel and carrier proteins in the plasma membrane are similar?

both directly connect the membrane to the nucleus of a cell.

both cause the phospholipid bilayer to form a rigid membrane for a cell.

both use energy to continuously move water molecules out of a cell.

both allow for the flow of molecules into and out of the cell.

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?

Describe the function of the endomembrane system? what organelles are involved?

18. which statement about cancer is true?