PORTAGE BIOCHEMISTRY MODULE 7
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
A scientist uses the term flux regarding a biochemical pathway. What does flux mean? - ANSWER Flux is
the rate of flow through a biochemical pathway.
A particular pathway breaks down proteins into amino acids. Is this an anabolic or a catabolic pathway? -
ANSWER Catabolic. This is degradation of a molecule.
The acetyl group is connected to CoA to make Acetyl-CoA. A) What specific atom of CoA connects to the
carbon atom on the acetyl group? B) What nucleotide base is part of CoA? - ANSWER A) Sulfur B)
Adenine
Both carbohydrates and lipids are broken down into Acetyl-CoA for further processing. What pathway
does Acetyl-CoA go to next? - ANSWER Citric Acid Cycle (CAC)
What is the "ETC" and what happens there? - ANSWER Electron transport chain. NADH is converted into
ATP
What is the sign (+ or -) of ΔG for the breakdown of ATP to ADP? Why is the sign important? - ANSWER (-
). A negative means spontaneous, or favorable, and is able to power other processes.
What molecule (FADH2, ATP, ADP, or CoA) is shown below? - ANSWER ADP
What are the two phases of glycolysis? How many reactions in each? - ANSWER The preparatory phase
and payoff phase. Five reactions in each.
How many ATPs are invested in glycolysis? - ANSWER 2
What is the net number of ATP gained from glycolysis? - ANSWER 2 (2 invested, 4 gained, for a net of 2)
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
A scientist uses the term flux regarding a biochemical pathway. What does flux mean? - ANSWER Flux is
the rate of flow through a biochemical pathway.
A particular pathway breaks down proteins into amino acids. Is this an anabolic or a catabolic pathway? -
ANSWER Catabolic. This is degradation of a molecule.
The acetyl group is connected to CoA to make Acetyl-CoA. A) What specific atom of CoA connects to the
carbon atom on the acetyl group? B) What nucleotide base is part of CoA? - ANSWER A) Sulfur B)
Adenine
Both carbohydrates and lipids are broken down into Acetyl-CoA for further processing. What pathway
does Acetyl-CoA go to next? - ANSWER Citric Acid Cycle (CAC)
What is the "ETC" and what happens there? - ANSWER Electron transport chain. NADH is converted into
ATP
What is the sign (+ or -) of ΔG for the breakdown of ATP to ADP? Why is the sign important? - ANSWER (-
). A negative means spontaneous, or favorable, and is able to power other processes.
What molecule (FADH2, ATP, ADP, or CoA) is shown below? - ANSWER ADP
What are the two phases of glycolysis? How many reactions in each? - ANSWER The preparatory phase
and payoff phase. Five reactions in each.
How many ATPs are invested in glycolysis? - ANSWER 2
What is the net number of ATP gained from glycolysis? - ANSWER 2 (2 invested, 4 gained, for a net of 2)
