39. Which one of the following statements is true? 1. In glycolysis, ATP is synthesized by both substrate-level and oxidative phosphorylation. 2. Fructose-1,6-bisphosphate is an allosteric factor for controlling by phosphofructokinase. 3. In the glyceraldehyde-3-phosphate dehydrogenase reaction, the amino acid cysteine is important in adding a second phosphate to glyceraldehyde phosphate. 4. During anaerobic metabolism in red blood cells, the carbons of glucose end up in lactic acid. 5. Phosphofructokinase and pyruvate kinase both are tetrameric. (A) All are true. (B) 1 and 4 are not true. (C) 5 is not true. (D) 1, 3 and 5 are not true. (E) 2 and 4 are not true.