12. Myoglobin and a single chain of hemoglobin have similar________ structures.(A)primary(B)secondary(C)tertiary(D)quaternary(E) none of the above

21. Which of the following statements about the pentose phosphate pathway is correct?(A)It generates 36 mol of ATP per mole of glucose consumed.(B)It generates 6 moles of CO2 for each mole of glucose consumed(C)It is a reductive pathway; it consumes NADH.(D)It is present in plants, but not in animals.(E) It provides precursors for the synthesis of nucleotides.

12. Myoglobin and a single chain of hemoglobin have similar________ structures.

(A)primary
(B)secondary

(C)tertiary

(D)quaternary

(E) none of the above

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