Starch and glycogen are both polymers of A. fructose B. Sucrose. C. alpha-D-gluc

Question

Starch and glycogen are both polymers of A. fructose B. Sucrose. C. alpha-D-glucose. D. beta-D-glucose. E. glucose 1-phosphate. Changes in hemoglobin's oxygen affinity are primarily the result of changes in the _____ structure of the protein. A. tertiary B. quaternary C. primary D. secondary E. all of the above In sickle cell hemoglobin, a Glu is mutated to a _____. This causes the formation of _____ between hemoglobin molecules, ultimately forming large aggregates. A. Cyst; disulfide bonds B. Val; hydrophobic interactions C. Arg; salt bridges D. Pro; disrupted alpha-helix, resulting in several H-bonds and salt bridges In a mixture of the five proteins listed below, which should elute out second in a size- exclusion (gel- filtration) chromatography? A. immunoglobulin G M_r = 145,000 B. serum albumin M_r = 68, 500 C. cytochrome c M_r = 13,000 D. RNA polymerase M_r = 450,000 E. ribonuclease A M_r = 13, 700 The PI of amino acids lysine and glycogen are 9.2 and 6.0. If the two amino acids are dissolved and subjected to electrophoresis in a buffer solution of pH = 7, Then a. Both will moved to the negative end b. Both will moved to the positive end c. Both will not move d. lysine moves to negative end while glycine moves to positive end e. lysine moves to positive end while glycine moves to negative end

Explanation / Answer

Strach and glycogen are polymers formed from glucose .They are the polymers of -D-glucose.       Sickle cell anaemia occurs due to point mutation in the beta globin chain of hemoglobin. In this type of hemoglobin a Glu is mutated to Val ie, the Glu 6 Val mutation in deoxy-HbS.So it favours a hydrophobic interaction between each strand of hemoglobin molecule and its neighbor. Immunoglobulin G mr = 145,000 The isoelectric point of glycine is 6 In aqueous solution pH value greater than 6 the average charge on glycine molecule becomes negative. At pH value less than 6 the molecule becomes positively charged. Lysine is a basic amino acid have the tendency to form cations when dissolved in water. Now when lysine and glysine are dissolved in a buffer of pH=7 then lysine moves towards positive side and glycine towards negative side.

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