This is the simplest form of lipid<span> made from three fatty acids with an ester linkage to a glycerol. Most triacylglycerols found in nature are from </span>two<span> or more different fatty acids. They are relatively insoluble in water and hydrophobic due to the non-polar nature of the aliphatic portion of the fatty acid chains.</span>
Two classes of genes, oncogenes and tumor suppressor genes, link cell cycle control to tumor formation and development. Oncogenes in their proto-oncogene state drive the cell cycle forward, allowing cells to proceed from one cell cycle stage to the next.
Plants and animals depend upon each other as mutual interdependence is must for their survival. Plants provide shelter for animals and they make oxygen for the animals to live. When animals die they decompose and become natural fertilizer plants. Plants depend on animals for nutrients, pollination and seed dispersal.
