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Chapter 14: Problem 17

At how many places in Kreb's cycle FADH \(_{2}\) is formed? (a) 1 (b) 2 (c) 3 (d) 4

Short Answer

Expert verified
The FADH\(_2\) is formed once in Kreb's cycle, so option (a) 1 is the correct answer.

Step by step solution

01

Understanding Kreb's cycle and Role of FADH\(_2\)

The first step is to recall the process of the Kreb's cycle. FADH\(_{2}\) is formed in the step where FAD+ takes up two hydrogen atoms to form FADH\(_2\). This step occurs in the conversion of Succinate to Fumarate.
02

Counting FADH\(_2\) formation in Kreb's cycle

The next step is to remember that in a single cycle, the formation of FADH\(_2\) happens once during the conversion of Succinate to Fumarate.
03

Selecting the correct answer

Based on the knowledge of Kreb's cycle and the formation of FADH\(_2\), one can determine the correct answer. It is clear that the formation of FADH\(_2\) occurs once in a single turn of Kreb's cycle.

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Key Concepts

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

FADH2 Formation
In the Krebs Cycle, also known as the Citric Acid Cycle, FADH\(_2\) plays a crucial role. This molecule is essential in the energy production process of the cell. FADH\(_2\) is created during one specific moment in the cycle. This occurs during the conversion of succinate to fumarate. Here, flavin adenine dinucleotide (FAD) acts as an electron acceptor.
It picks up two hydrogen atoms, becoming FADH\(_2\). This process is vital because it helps shuttle high-energy electrons to the electron transport chain.
  • FADH\(_2\) formation occurs only once per cycle.
  • It provides electrons for ATP production, helping generate energy efficiently.
  • This adds to the body's overall energy yield.
The production of FADH\(_2\) is more than just a singular event; it is part of a larger energy-producing mechanism essential for cellular respiration.
Succinate to Fumarate Conversion
The conversion of succinate to fumarate is one of the key reactions within the Krebs Cycle. This transformation is facilitated by the enzyme succinate dehydrogenase. It is the only enzyme in the Krebs cycle that is also part of the electron transport chain.
This conversion involves the oxidation of succinate to form fumarate. During this reaction, FAD is reduced to FADH\(_2\).
  • Succinate donates electrons to FAD, reducing it to FADH\(_2\).
  • FADH\(_2\) captures and stores electrons for later use in the electron transport chain.
  • This step is vital for maintaining the cycle's energy balance.
Beyond its role in forming FADH\(_2\), succinate's conversion is crucial for the continuing cycle of energy production and regeneration of oxaloacetate. This prepares it for a new cycle beginning.
Metabolic Pathways
Metabolic pathways, like the Krebs Cycle, are a series of chemical reactions that occur within a biological entity. These pathways sustain life processes by facilitating the production and breakdown of biomolecules. The Krebs Cycle is central to cell metabolism as it connects various metabolic pathways. It is a source of reducing agents like NADH and FADH\(_2\), which are crucial for ATP production.
  • The Krebs Cycle is a link between carbohydrate, fat, and protein metabolism.
  • It helps harness energy efficiently for cellular activities.
  • It provides intermediates for biosynthetic processes.
Understanding these pathways is fundamental as they showcase the interconnectedness within cellular activities. The energy captured during these processes is vital for the organism's survival and efficiency.

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Most popular questions from this chapter

The connecting link among glycolysis, Kreb's cycle and beta-oxidation of fatty acid is (a) Pyruvic acid (b) Acetyl-CoA (c) Acetaldehyde (d) Citric acid

The common phase between aerobic and anaerobic respiration is called (a) Tricarboxylic acid cycle (b) Oxidative phosphorylation (c) Embden, Meyerhoff, Parnas cycle (d) Kreb's cycle

Assertion: ATP acts as energy currency of cell. Reason: ATP broken down whenever and wherever energy needs to be utilized.

In how many steps, \(\mathrm{CO}_{2}\) is released in aerobic respiration of pyruvic acid? (a) One (b) Six (c) Three (d) Twelve

Amino acid enters in the respiratory pathway at (a) Kreb's cycle (b) Pyruvate (c) Acetyl CoA (d) Any of these
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