Okay, now I see the questions section at the bottom of the worksheet. The first question asks for the location of the Krebs Cycle, which is in the mitochondrial matrix. The second question asks what molecule enters the cycle, which is Acetyl CoA. The third question asks for the number of carbon atoms in the starting molecule (Acetyl CoA), which is 2. The fourth question asks for the number of carbon atoms in the final molecule (Oxaloacetate), which is 4. The fifth question asks for the number of NADH molecules produced per turn of the cycle, which is 3. The sixth question asks for the number of FADH2 molecules produced per turn of the cycle, which is 1. The seventh question asks for the number of ATP molecules produced per turn of the cycle, which is 1. The eighth question asks for the total number of carbon atoms lost as CO2 per turn of the cycle, which is 2. The ninth question asks for the total number of high-energy electron carriers produced per turn of the cycle, which is 4 (3 NADH + 1 FADH2). The tenth question asks for the total number of ATP molecules that can be produced from the high-energy electron carriers, which is 10 (3 NADH x 2.5 ATP/NADH + 1 FADH2 x 1.5 ATP/FADH2).
Now, I will provide a complete solution to the worksheet.
Solution to the Krebs Cycle Worksheet
Based on the diagram and standard biochemical knowledge of the Krebs Cycle (Citric Acid Cycle), here is the completed worksheet:
Diagram Labels:
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Top (Entry Point): Acetyl CoA (2C) + Oxaloacetate (4C) → Citrate (6C)
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Right (First Decarboxylation): Isocitrate (6C) → Alpha-Ketoglutarate (5C) + CO2 + NADH
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Bottom (Substrate-Level Phosphorylation): Succinyl CoA (4C) → Succinate (4C) + ATP (or GTP)
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Left (Final Step): Malate (4C) → Oxaloacetate (4C) + NADH
Answers to Questions:
1.
Location: Mitochondrial matrix
2.
Molecule that enters the cycle: Acetyl CoA
3.
Number of carbon atoms in the starting molecule (Acetyl CoA): 2
4.
Number of carbon atoms in the final molecule (Oxaloacetate): 4
5.
Number of NADH molecules produced per turn of the cycle: 3
6.
Number of FADH2 molecules produced per turn of the cycle: 1
7.
Number of ATP molecules produced per turn of the cycle: 1
8.
Total number of carbon atoms lost as CO2 per turn of the cycle: 2
9.
Total number of high-energy electron carriers produced per turn of the cycle: 4 (3 NADH + 1 FADH2)
10.
Total number of ATP molecules that can be produced from the high-energy electron carriers: Approximately 10 (based on 2.5 ATP per NADH and 1.5 ATP per FADH2)
This completes the solution to the worksheet.
Parent Tip: Review the logic above to help your child master the concept of krebs cycle worksheet.
