Theories explain phenomena, whilst laws are generalizations which characterize them.
Answer:
Embedded in the lipid bilayer are large proteins, many of which transport ions and water-soluble molecules across the membrane. Some proteins in the plasma membrane form open pores, called membrane channels, which allow the free diffusion of ions into and out of the cell.
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The epiglottis. It prevents food from entering the respiratory tract
The origins of replication (ori). eukaryotes: lots of oris. prokaryotes: one ori
