Question

6. Below is a reaction pathway. Place an asterisk (*) by steps that may be the best control points: F GHI A →B D 7. Phosphorylated serine can enter glycolysis/ gluconeogenesis as 3-phosphoglycerate. a) How many net ATP are made or consumed for each 3-phosphoglycerate that enters glycolysis? A total of are (choose one: made consumed) b) How many net ATP are made or consumed when TWO 3-phosphoglycerates are used to make ONE glucose molecule via gluconeogenesis? A total of are (choose one: made consumed) c) If the 3-phosphoglycerate was radioactively labeled on carbon-2 (the middle carbon), what carbon(s) of glucose would be labeled at the end of gluconeogenesis? 8. Indicate whether the control molecule, given below, when present at high levels, activates or inhibits the processes given below. Activates (+) or Inhibits (-) Process Glycolysis Citric Acid Cycle Citric Acid Cycle Control Molecule ADP NADH Ca2+ (released in muscle as signal to contraction)

Answer 1

For analogy sake, consider the craving for burger, when you don't eat to eat a burger for a long time. You start craving for food, but not any food, just burger. Someone who gets to eat burgers daily will rarely get craving of it due to excess of it. Similarly if enough F and J are produced the reaction will not favour the formation of D.

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