Â© Ted French. Definition: A function is a preset formula in Excel and Google Spreadsheets. Like formulas, functions begin with the equal sign (=) followed by the function's name and its arguments. The function name tells Excel what calculation to perform. The arguments are contained inside round brackets.
Best Answer: Look for molecular symmetries. Symmetrical molecules such as methane, carbon dioxide, carbon disulfide, and borane (BH3) are nonpolar. Asymmetric molecules such as water, ammonia, and acetone are polar.
Since a lipid molecule contains regions that are both polar and nonpolar, they are called amphipathic molecules. Figure %: Basic Lipid Structure. The most abundant class of lipid molecule found in cell membranes is the phospholipid.The phospholipid molecule's polar head group contains a phosphate group.It also sports two nonpolar fatty acid chain groups as its tail. Figure %: Phospholipid Structure. The fatty acid tail is composed of a string of carbons and hydrogens. It has a kink in one of the chains because of its double-bond structure.he phospholipid molecule's polar head group contains a phosphate group. It also sports two nonpolar fatty acid chain groups as its tail. Figure %: Phospholipid Structure. The fatty acid tail is composed of a string of carbons and hydrogens.