Ans.
Regulation of cell division includes various controlling processes that inhibit uncontrolled cell division, to prevent development of tumors. Density-dependent inhibition involves reduction in cell division, when a population of cells acquires certain density. It leads to contact between cell surface proteins of adjoining cells that gives negative signals for cell division and thus, prevent cell division.
Thus, the correct answer is 'as cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing.'
Cancer cells reproduce the same way the other cells reproduce. The difference between cancer cells and others is that their reproduction is uncontrollable. They constantly go through the cell cycle and they reproduce. Two ways cell reproductions are meiosis and mitosis. DNA duplicates itself. Cancer is incessantly receiving messages.
A solute is the part that gets dissolved in the solvent, so the solute is the sugar
Answer:
640 cm3: the step from cm to mm is ×10 so the answer is 640
