Which of these cannot rapidly pass directly through the phospholipids of the plasma membrane?
-lipid soluble molecule
-water
-glucose
-hydrogen ion

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Contrast how pollination is different among gymnosperms and angiosperms.

Explain why the plants cortex would serve as the best food source for animals