Draw the structure of a saturated fatty acid group in phosphatidylcholine

A major ingredient in peanut butter cup candy is soy lecithin. Draw the structure of lecithin.

Determine the class of lipid (see attached image for choices) shown by the following structures and whether if it is saponifiable or non-saponifiable.

Illustrate and explain the difference between α-D-glucopyranose and  β-D-glucopyranose structures.

Define a saturated fatty acid. Provide one example of a saturated fatty acid.

Calculate the isoelectric point (pl) of the oligo peptide PEPTIDE. Ans=3

Basic chemical properties of polar uncharged amino acids in proteins. Use a few examples.

On Dimyristoyl phosphatidylserine, Palmytoyl-Oleoyl Phosphatidylcholine and Sphingomyelin, What is the capacity of each of these to form hydrogen bonds with its neighbours

Explain the importance of isoelectric point in proteins in the given data below

Histidine is an amino acid containing an ionizable group in its side chain. This ionizable group has a pka of 6.0, meaning that His is in its deprotonated form at physiological pH (7.0-7.4). However, His is included in the positively charged amino acid category. Calculate the ratio of deprotonated/protonated His at pH 7.0, and use your answer to justify why this amino acid is included in the positively charged amino acid category. Show all work for full credit.