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Chapter 7: Problem 9

Which of the following is a major source of electrons for the electron transport chain? (a) \(\mathrm{H}_{2} \mathrm{O}\) (b) ATP (c) NADH (d) ATP synthase (e) coenzyme A

Short Answer

Expert verified
The major source of electrons for the electron transport chain is NADH (option c).

Step by step solution

01

Identify the Context of the Electron Transport Chain

The electron transport chain (ETC) is a series of complexes that transfer electrons from electron donors to electron acceptors via redox reactions. This process generates an electrochemical gradient that is used to produce ATP.
02

Understand the Role of NADH

NADH is a major electron carrier and donor in cellular respiration. It is produced in glycolysis and the citric acid cycle and then donates electrons to the ETC.
03

Evaluate Each Option

- Option (a) \(\mathrm{H}_{2} \mathrm{O}\): Water is produced at the end of the ETC, not a source of electrons.- Option (b) ATP: ATP is synthesized using the gradient created by the ETC, but is not a source of electrons.- Option (c) NADH: Provides electrons to the ETC, playing a crucial role in energy production.- Option (d) ATP synthase: Acts as an enzyme in the production of ATP, not providing electrons.- Option (e) coenzyme A: Involved in the citric acid cycle, but not directly donating electrons to the ETC.
04

Conclusion

Based on the analysis, NADH is the primary electron donor to the electron transport chain, making it the correct answer.

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Key Concepts

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

NADH
NADH stands for Nicotinamide Adenine Dinucleotide (NAD) with an additional hydrogen ion, and it is crucial in cellular respiration. During processes like glycolysis and the citric acid cycle, NAD+ accepts electrons and hydrogen ions, converting into NADH.

NADH serves as a shuttle, transporting these high-energy electrons to the electron transport chain (ETC). Here, NADH donates its electrons, releasing energy that is used to synthesize ATP. Thus, NADH acts as a key electron donor, enabling the entire process of respiration to continue efficiently.
cellular respiration
Cellular respiration is a series of metabolic processes that convert biochemical energy from nutrients into ATP. This multi-step process occurs in three main stages:
  • Glycolysis: The breakdown of glucose into pyruvate, yielding a few molecules of ATP and converting NAD+ into NADH.
  • Citric Acid Cycle: Further oxidation of metabolites, producing more NADH and FADH2, and small amounts of ATP.
  • Electron Transport Chain (ETC): Utilizing electrons from NADH and FADH2 to generate a proton gradient for ATP production.
The ETC is the final and most energy-productive stage. It is here that the energy currency of cells, ATP, is produced in large amounts.
ATP synthesis
ATP synthesis is the process of generating adenosine triphosphate (ATP), the energy currency of the cell. Within the mitochondria, the electron transport chain (ETC) plays a crucial role in this process.

The ETC creates a proton gradient across the inner mitochondrial membrane, known as the proton motive force. ATP synthase, an enzyme complex, utilizes this force to convert ADP and inorganic phosphate into ATP. This is through oxidative phosphorylation, powered by the electrons donated from NADH and FADH2.

Hence, ATP synthesis is intimately tied to the electron flow and chemical gradients established by the ETC.
redox reactions
Redox reactions, short for reduction-oxidation reactions, are chemical processes involving the transfer of electrons between molecules. In these reactions, one molecule is oxidized (loses electrons) while another is reduced (gains electrons).
  • In the context of cellular metabolism, NAD+ reduction to NADH is an example of a redox reaction facilitating electron transport.
  • In the electron transport chain, these reactions enable the stepwise transfer of energy, which drives proton pumping and ultimately ATP synthesis.
Redox reactions are essential in biological systems, acting as drivers for various metabolic pathways, including cellular respiration.

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Most popular questions from this chapter

Which multiprotein complex in the electron transport chain is responsible for reducing molecular oxygen? (a) complex I (NADH-ubiquinone oxidoreductase) (b) complex II (succinate- ubiquinone reductase) (c) complex III (ubiquinonecytochrome coxidoreductase) (d) complex IV (cytochrome coxidase) (e) complex V (ATP synthase)

The synthetic aspect of metabolism is called (a) anabolism (b) fermentation (c) catabolism (d) oxidative phosphorylation (e) chemiosmosis

In the first step of the citric acid cycle, acetyl CoA reacts with oxaloacetate to form (a) pyruvate (b) citrate (c) NADH (d) ATP (e) \(\mathrm{CO}_{2}\)

The pathway through which glucose is degraded to pyruvate is called (a) aerobic respiration (b) the citric acid cycle (c) the oxidation of pyruvate (d) alcohol fermentation (e) glycolysis

A chemical process during which a substance gains electrons is called (a) oxidation (b) oxidative phosphorylation (c) deamination (d) reduction (e) dehydrogenation
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