Q. Which one of the biomolecules is correctly characterised
AIPMTAIPMT 2012Biomolecules
Solution:
Lecithin is a triglyceride lipid where one fatty acid is replaced by phosphoric acid which is linked to additional nitrogenous group called choline. It is a common membrane lipid. It is an amphipathic phospholipid having both hydrophilic polar and hydrophobic nonpolar groups, The hydrocarbon chains of two fatty acids function as hydrophobic non-polar tails whereas the phosphate and choline behave as hydrophilic polar head group of the molecule. Palmitic acid is a saturated fatty acid (as it does not possess double bonds in its carbon chain) and contains 16 carbon atoms with formula C16H32O2 . Adenylic acid or adenosine monophosphate is a nucleotide formed by union of adenine (nitrogenous base), ribose (pentose sugar) and phosphate. It is formed through j phosphorylation of nucleoside as phosphate combines with sugar molecule at its 5' carbon atom. Amino acids are organic acids with carboxylic group (-COOH) having amino group (-NH2) generally attached to at carbon or carbon next to carboxylic group. Alanine is a non-polar and neutral amino acid having one methyl group and having amino group attached to carbon next to carboxylic group.
