Consider the first four reactions of the pentose phosphate pathway, as shown bel

Question

Consider the first four reactions of the pentose phosphate pathway, as shown below. Please note that more than one reaction can occur within a single step and that cofactors (see the table in chapter 15) required for these reactions may not be shown.

Take a few moments to figure out which reactions are taking place at each step in this pathway, then answer the following questions

a. Two of these reactions are redox reactions. Which reactions are they? State whether they are oxidation or reduction reactions.

b. Which cofactor is required for these reactions?

c. Which of these reactions involves phosphoryl transfer? Are any cofactor(s) that are not shown required for this reaction? Why or why not?

d. One of the reactions involves the formation or breaking of C-C bonds. Which one is it?

e. Consider the reaction you listed above in the C-C bond forming direction, which may be the reverse of the reaction shown. Write the structures of the nucleophile and electrophile involved.

Explanation / Answer

(a) step 3 , step 4 are redox reaction. in both reduction takes place.

       in step 3 H+ is added. in step 4 Oxygen eleimnated as CO2

(b) cofactor is may coenzyme (you missed table)

(c) step 1 involved phospryl transfer

(d) step 4 involved breaking of C-C bond .

(e) electrophile is O =C=O. nucleophile end compond which is nearer to O=C=O

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