Having a really hard time following this diagram of the Kreb cycle and I need to answer these questions:
1. Total number of NADH molecules produced for each glucose molecule in the Krebs cycle.
A)2 B)4 C)6 D)8 E)10
2. The theoretical yield of ATP from each NADH molecule.
A)1 B)2 C)3 D)4 E)5
3. Total number of CO2 molecules produced in the Krebs cycle for each pyruvate molecule.
A)1 B)2 C)3 D)4 E)5
To answer these questions about the Krebs cycle, you need to understand the steps and products of the cycle. Here's a breakdown of the answers and how to arrive at them:
1. Total number of NADH molecules produced for each glucose molecule in the Krebs cycle:
- The Krebs cycle begins with the conversion of one molecule of glucose into two molecules of pyruvate during glycolysis.
- Each pyruvate molecule then enters the mitochondria and is further broken down in the Krebs cycle.
- In the Krebs cycle, each pyruvate molecule generates 3 NADH molecules.
- Since glucose produces two pyruvate molecules, the total number of NADH molecules produced is 2 × 3 = 6.
- Therefore, the correct answer is C) 6.
2. The theoretical yield of ATP from each NADH molecule:
- In oxidative phosphorylation, NADH delivers its electrons to the electron transport chain, leading to the production of ATP.
- The theoretical yield of ATP from each NADH molecule is directly related to the number of ATP produced per pair of electrons passing through the electron transport chain.
- Generally, each pair of electrons passing through the electron transport chain leads to the synthesis of around 3 ATP molecules.
- Therefore, the correct answer is C) 3.
3. Total number of CO2 molecules produced in the Krebs cycle for each pyruvate molecule:
- Each pyruvate molecule enters the Krebs cycle and goes through a series of reactions that ultimately release carbon dioxide (CO2) as a waste product.
- During each round of the Krebs cycle, one pyruvate molecule produces 3 molecules of CO2.
- Since each glucose molecule produces two pyruvate molecules, the total number of CO2 molecules produced is 2 × 3 = 6.
- Therefore, the correct answer is C) 3.
By understanding the steps and products of the Krebs cycle, you can answer these questions. Remember, practice and familiarity with the topic increases your ability to comprehend and answer questions accurately.