I think the answer is B - a star! Hope this helps!
This is because the GP120 protein
of the HIV virus that forms the ‘knob’ is
essential for the infection of CD4 cells
of the immune system by the virus. The glycoprotein is, therefore, a good
target for vaccines especially since the
molecule is highly conserved because most mutations in the region could be highly deleterious to the virus.
The specialized hearing receptors found in the cochlea would be hair cells.
Answer:
Ideal cell is defined to be the cell will zero internal resistance.