Scientists cultured and used Henrietta Lacks' Hela cells to conduct research. The cells were also used to determine the effectiveness of treatment for certain diseases. However, normal cells may also be grown in a laboratory setting. An illustration of normal cells are growing in a petri dish is shown below.
Cells placed in a petri dish will
continue to divide until the
spaces between the cells are
filled and the cells meet the
wall of the petri dish. A single
layer of cells is produced
o
Any cells that are removed
will leave an empty space in
the petri dish.
Cells nearby will begin to
divide again until the spaces
are filled again.
Which of the following is NOT reflected by this illustration and cell division of normal cells?
O Cells growth is random and uncontrolled.
O Cell division can be regulated by factors outside the cell.
The controls on cell growth and division can be turned on and off.
When cells come into contact with other cells, they stop growing.