Which one of the following biomolecules is correctly characterized?

Explanation

Lecithin is a triglyceride lipid where one fatty acid is replaced by phosphoric acid, which is linked to an 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 non­polar tails, whereas the phosphate and choline behave as a 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 C 16 H 32 O2. Adenylic acid or adenosine monophosphate is a nucleotide formed by the union of adenine (nitrogenous base), ribose (pentose sugar), and phosphate. It is formed through phosphorylation of nucleoside as phosphate combines with sugar molecule at its 5 carbon atom. Amino acids are organic acids with a carboxylic group (-COOH) having an amino group (- NH 2) generally attached to a­ carbon or carbon next to a carboxylic group. Alanine is a nonpolar and neutral amino acid having one methyl group and having an amino group attached to the carbon next to the carboxylic group.