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Chapter 7: Problem 10

GTP, which can be converted to ATP, is produced during which reaction of the citric acid cycle? a. isocitrate into \(\alpha\) -ketoglutarate b. succinyl-CoA into succinate c. fumarate into malate d. malate into oxaloacetate

Short Answer

Expert verified
b. succinyl-CoA into succinate

Step by step solution

01

Understand the Citric Acid Cycle

The citric acid cycle, also known as the Krebs cycle or TCA cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA.
02

Identify Where GTP is Produced

GTP (guanosine triphosphate) is produced in one particular step of the citric acid cycle. This step is catalyzed by the enzyme succinyl-CoA synthetase.
03

Determine the Specific Reaction

The conversion of succinyl-CoA to succinate is coupled to the phosphorylation of GDP to GTP. This step is one of substrate-level phosphorylation.
04

Select the Correct Answer

Given the reactions listed in the options, the correct one is: succinyl-CoA into succinate.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

GTP production
In the citric acid cycle, energy is produced and stored in different forms. One such form is GTP (guanosine triphosphate), which is very similar to ATP (adenosine triphosphate). GTP can easily be converted to ATP, the primary energy currency of the cell. But where exactly is GTP produced in the citric acid cycle? The answer lies in the conversion of succinyl-CoA to succinate. This reaction is a key part of the citric acid cycle and is catalyzed by the enzyme succinyl-CoA synthetase. This is the only step in the cycle where GTP is directly produced. This production process is a great example of substrate-level phosphorylation, an essential mechanism of energy production in cells.
succinyl-CoA synthetase
Succinyl-CoA synthetase is the enzyme responsible for catalyzing the conversion of succinyl-CoA to succinate in the citric acid cycle. This enzyme is unique because it not only facilitates the breakdown of succinyl-CoA, but it also plays a critical role in energy production by generating GTP in the process. The enzyme uses the energy released from the breakdown of the thioester bond in succinyl-CoA to drive the phosphorylation of GDP into GTP. This coupling of energy release and GTP generation is an elegant example of how the citric acid cycle efficiently manages and stores energy for the cell's needs.
substrate-level phosphorylation
Substrate-level phosphorylation is a method of ATP or GTP production that occurs directly in the metabolic pathway, without the need for an electron transport chain. In the citric acid cycle, this process is beautifully showcased in the step where succinyl-CoA is converted to succinate. During this step, the enzyme succinyl-CoA synthetase transfers a phosphate group to GDP, forming GTP. This method of energy transfer is distinct from oxidative phosphorylation, which involves the generation of ATP through a gradient-driven mechanism in the mitochondria. Substrate-level phosphorylation provides a direct, but limited, means to produce energy quickly, which is crucial for many cellular functions.

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Most popular questions from this chapter

Which of the following fermentation methods can occur in animal skeletal muscles? a. lactic acid fermentation b. alcohol fermentation c. mixed acid fermentation d. propionic fermentation

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E. coli are enteric (gut-dwelling) facultative anaerobic bacteria. (Facultative anaerobes can grow either with or without free oxygen. Obligatory anaerobes grow only in the absence of free oxygen.) Researchers planned to grow cultures of \(E .\) coli under a range of conditions to model the transition from strictly anaerobic to aerobic respiration. The oxygen content of atmospheres at constant total pressure will be controlled by volumes of nitrogen and oxygen gases. Ratios of volume, \(r=\mathrm{V}_{\mathrm{O}_{2}} / \mathrm{V}_{\mathrm{N}_{2}}\) between 0 and 0.25 of shaken growth flasks can be measured in terms of optical density, which is the percent of transmission of light through a sample of the growing \(E\) . coli culture. A rule of thumb is that the range of strict anaerobes is when r \(<0.01,\) and the boundary for aerobic respiration is when \(\mathrm{r}\) \(=0.05 .\) A large number of flasks that can be constantly shaken at fixed temperature, and from which samples can be taken without atmospheric contamination, are available for this study. These results of the experiment will be used to infer growth rates of \(E\) . coli along the entire 7.5 \(\mathrm{m}\) length of the average human intestine (small intestine and large intestine), where the oxygen content varies from atmospheric to anaerobic conditions. The retention time of food in the small intestine, whose average length is \(2.5 \mathrm{m},\) is approximately four hours. The retention time of food over the entire length of the intestine is between 24 and 72 hours. A. Describe and apply a mathematical model that can be used to represent the variation of oxygen environments of a bacterium that is being transported with the food along the length of the intestine. B. Design the experimental sampling times in terms of growth intervals of interest in this study: i) the time when the bacteria is passing the small-large intestine boundary; ii) the time when the bacteria reaches the end of the large intestine; and iii) the time when the bacterium reaches facultative anaerobic conditions, r \(<0.05 .\)C. C. Sketch a graph that predicts the distribution of aerobic, facultative anaerobic and obligatory anaerobic bacteria along the length of the entire intestine based on these parameters. Keep in mind that anaerobes have a lower respiration rate.
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