The nonoxidative phase of the pentose phosphate pathway is the reverse of the reactions in the oxidative phase. has a heptose intermediate. is impaired in glucose‑6‑phosphate dehydrogenase deficiency. is irreversible under physiological conditions.

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

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Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.