OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
Carbohydrates
|
|
Proteins
|
|
Lipids
|
|
Nucleic acids
|
Detailed explanation-1: -A wide range of mostly nonpolar substances are referred to as lipids. This is because they are primarily nonpolar carbon-carbon or carbon-hydrogen bonds in hydrocarbons. Hydrophobic, or “water repelling, ‘’ non-polar compounds cannot dissolve in water. In a cell, lipids serve numerous purposes.
Detailed explanation-2: -Since the hydrocarbon chains are very non-polar, fats do no dissolve in water; instead, fat molecules tend to coalesce with one another. Since a fat molecule has 3 fatty acids connected to a glycerol molecule, they are also called trigylcerides.
Detailed explanation-3: -Lipids are all insoluble in polar solvents like water but highly soluble in the non-polar or weakly polar organic solvents, including ether, chloroform, benzene, and acetone. In fact, these four solvents are often referred to as “lipid-solvents” or “fat-solvents".
Detailed explanation-4: -Most lipids are non-polar (having no charged areas) or only slightly polar, with a very few charged areas. Water mixes with hydrophilic (water-loving) compounds by sticking to their charged groups. Since lipids lack charged groups, the water molecules have nothing to stick to and don’t mix with them.