Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton.
Answer:
Yes, the plasma membrane is a selectively permeable membrane. Two differences are that...
1. Osmosis involves water.
2. Diffusion involves air molecules.
All amino acids have a center carbon. The center carbon has four different molecules attached to it, these are: AMINO GROUP [NH2], CARBOXYL GROUP [COOH], AN R GROUP [R] AND A HYDROGEN ATOM. There are twenty different amino acids in existence, each amino acid differ from another one based on their R groups. The R group is specific and unique to each amino acid. The center carbon in amino acid structure is also called alpha carbon.
The hurricane Floyd took place in the East Coast of the United States during 1999. It caused extensive destruction in its path. However, there was one fact that was astonishing for the scientists is that in spite of causing such a mass destruction on the terrestrial surface, the hurricane resulted in no harm to the aquatic life. That is, no major fishes were killed during the hurricane.
It helps you prepare for medical school because your helping to treat people who aren't doing so well
