Answer: Sickle-cell disease
Explanation:
Sickle-cell disease is characterized by the presence of a sickle shaped red blood cell, due to the substitution of glutamate with valine in the amino acid sequence of the protein globin portion.
Hence, the sickled shaped globin is unable to transport oxygen efficiently to body tissues, resulting in malfunction of the red blood cell.
The movement of substances across the cell membrane either into or out of the cell
People would keep doing the same investigation over and over again and no one would know who did what
Continuous cell lines can be maintained through an indefinite number of generation :)