8. What is the most significant chemical difference between triacylglycerols and glycerophospholipids that leads to their different functions? 

4. At pH 7.0, in what order would the following three peptides be eluted from a column filled with a cation-exchange polymer? Their amino acid compositions are:     Protein A    : Ala 5%, Glu 10%, Gly 10%, Leu 5%, Asp 10%, Arg 5%, Met 5%, Cys 5%, Tyr 5%, Phe 5%, His 5%, Val 5%, Pro 5%, Thr 5%, Ser 5%, Asn 5%, and Gln 5%.     Protein B    : Ala 5%, Glu 5%, Ser 5%, Leu 10%, Arg 10%, His 5%, Ile 10%, Phe 5%, Tyr 5%, Lys 10%, Gly 15%, Pro 5%, and Trp 10%.     Protein C    : Ala 5%, Val 5%, Gly 10%, Asp 5%, Leu 5%, Arg 5%, Ile 5%, Phe 5%, Tyr 5%, Lys 5%, Trp 5%, Ser 5%, Thr 5%, Glu 5%, Asn 5%, Pro 10%, Met 5%, and Cys 5%.

5. Estimate the Vmax and Km of the enzyme-catalyzed reaction for which the following data were obtained. 

6. Describe the metabolic functions of the oxidative pentose phosphate pathway and the reductive pentose phosphate pathway. 

7. All of the intermediates in the glycolytic pathway are phosphorylated. Describe the reasons why this might be advantageous to the cell. 

(a) sucrose,

(b) cellulose, and

(c) glycogen.

 (a) Lectins

(b) Membrane rafts

(c) Mutarotation