27) Fill in the blanks Cells adjacent to one another frequently communicate through Other forms of cell-cell communication through In extracellular signaling ligand-receptor interaction induce; 28)...

Extracted text: 27) Fill in the blanks Cells adjacent to one another frequently communicate through Other forms of cell-cell communication through In extracellular signaling ligand-receptor interaction induce; 28) Cell-to-cell communication by extracellular signaling usually involves six steps , sort the below given steps according to happening order; Removal of the signal, which usually terminates the cellular response – degradation of ligand- A change in cellular metabolism, function, or development CELLULAR RESPONSE triggered by the receptor-ligand complex – specific to the ligand-receptor complex Release of the signaling molecule by the signaling cell Transport of the signal to the target cell Synthesis of the signaling molecule by the signaling cell Detection of the signal by a specific receptor protein (receptor-ligand specificity 29) Polyethylene can be obtained in two different forms. High-density polyethylene (0.94 g/cm3) is a linear polymer. Low-density polyethylene (0.92 g/cm3) is a branched polymer with short side-chains on 3% of the atoms along the polymer chain. What could be the reason of the change in the polymer density difference?