Fatty Acid Metabolism Quiz

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Questions and Answers

What is the primary role of fatty acids in the liver and heart?

  • Transport vitamins through the bloodstream
  • Serve as a structural component of cell membranes
  • Provide a significant source of energy (correct)
  • Store excess carbohydrates as fats

Which substance facilitates the transport of fatty acids into mitochondria?

  • Glycerol
  • Coenzyme A
  • Albumin
  • Carnitine (correct)

How many ATP molecules are net produced from the complete oxidation of palmitic acid (C16)?

  • 96 ATP
  • 129 ATP (correct)
  • 131 ATP
  • 44 ATP

What is the initial step in the activation of fatty acids before oxidation?

<p>Conjugation with CoA (C)</p> Signup and view all the answers

In which stage of fatty acid oxidation is NADH and FADH2 produced?

<p>β-oxidation (C)</p> Signup and view all the answers

What ultimately determines whether acetyl-CoA enters the TCA cycle or is converted into ketone bodies?

<p>The level of oxaloacetate (OAA) (C)</p> Signup and view all the answers

What occurs in untreated diabetes mellitus that leads to the overproduction of ketone bodies?

<p>Glucose accumulates in the bloodstream due to lack of insulin (D)</p> Signup and view all the answers

What happens to oxaloacetate levels during starvation, and what is its consequence?

<p>They decrease, forcing acetyl-CoA to convert to ketone bodies (A)</p> Signup and view all the answers

What physiological condition results from the inability of peripheral tissues to utilize ketone bodies quickly enough?

<p>Ketoacidosis (C)</p> Signup and view all the answers

Which of the following best describes the role of glucagon in the context of ketone body production?

<p>Promotes beta-oxidation (B)</p> Signup and view all the answers

What stimulates the synthesis of malonyl-CoA in fatty acid oxidation?

<p>High glucose levels (D)</p> Signup and view all the answers

Which enzyme converts methylmalonyl-CoA to succinyl-CoA?

<p>Methylmalonyl-CoA mutase (D)</p> Signup and view all the answers

Which vitamin is essential for the synthesis of succinyl-CoA?

<p>Vitamin B12 (D)</p> Signup and view all the answers

What effect does malonyl-CoA have on fatty acid oxidation?

<p>Inhibits the transport of fatty acids into mitochondria (A)</p> Signup and view all the answers

Which of the following ketone bodies contributes to ketoacidosis?

<p>Acetoacetate (A)</p> Signup and view all the answers

What is the role of hydroxocobalamin as approved by the FDA in December 2006?

<p>Remedy for cyanide poisoning (D)</p> Signup and view all the answers

Which tissues are able to utilize ketone bodies when glucose is unavailable?

<p>Muscles, renal cortex, and brain (C)</p> Signup and view all the answers

Which of the following does NOT synthesize Vitamin B12?

<p>Plants (B)</p> Signup and view all the answers

Which of the following is NOT a ketone body?

<p>Pyruvate (C)</p> Signup and view all the answers

What is the primary alternative fuel to sugars mentioned for use in other tissues?

<p>Acetyl-CoA (A)</p> Signup and view all the answers

What is the primary energy yield from one NADH during cellular respiration?

<p>3 ATP (A)</p> Signup and view all the answers

What is the main challenge faced during the oxidation of monounsaturated fatty acids?

<p>Isomerization requires additional enzymes (A)</p> Signup and view all the answers

Which enzyme is needed to produce the trans-2 cis-4 intermediate during the oxidation of some polyunsaturated fatty acids?

<p>Reductase (D)</p> Signup and view all the answers

What product is generated at the end of the beta-oxidation of odd-numbered fatty acids?

<p>Propionyl-CoA (C)</p> Signup and view all the answers

What does coenzyme B12 primarily catalyze in the metabolism of odd-number fatty acids?

<p>Isomerization of propionyl-CoA (A)</p> Signup and view all the answers

How does the energy yield from polyunsaturated fatty acids compare to that of saturated fatty acids?

<p>Less energy due to required reducing power (A)</p> Signup and view all the answers

Which statement accurately describes the beta-oxidation of unsaturated fatty acids?

<p>Cis double bonds require enzymes for effective oxidation (A)</p> Signup and view all the answers

Flashcards

Fatty Acid Catabolism

The process of breaking down fatty acids for energy production.

Fatty Acid Activation

The preparatory step where fatty acids are conjugated with CoA to enter the mitochondria.

β-Oxidation

The process of breaking down fatty acids two carbons at a time in the mitochondria.

Carnitine Shuttle

The process of moving fatty acids across the inner mitochondrial membrane for oxidation.

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Energy Yield from Fatty Acids

The total ATP produced from the complete oxidation of a fatty acid, typically higher than from glucose.

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Unsaturated Fatty Acid Oxidation

The breakdown of unsaturated fatty acids, which requires additional enzymes due to their double bonds, resulting in a slightly lower energy yield than saturated fatty acids.

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Odd-Number Fatty Acid Oxidation

The breakdown of odd-numbered fatty acids produces propionyl-CoA, a 3-carbon fragment, which is then converted to succinyl-CoA, a 4-carbon fragment.

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Isomerase Enzyme

An enzyme that changes the structure of a molecule by rearranging its atoms or bonds, specifically important in adjusting the position of double bonds in unsaturated fatty acid oxidation.

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Coenzyme B12

A coenzyme crucial in the isomerization step of odd-number fatty acid oxidation.

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Ketone Body Formation

The liver converts acetyl-CoA from fatty acid breakdown into ketone bodies when oxaloacetate (OAA) levels are low.

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Ketone Body Use

Peripheral tissues (non-liver) utilize ketone bodies for energy by converting them to acetyl-CoA.

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Cis-Trans Conversion

A process involving the conversion of a cis double bond to a trans double bond, performed by a reductase, during certain steps of unsaturated fatty acid $eta$-oxidation.

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Starvation/Diabetes & Ketone Bodies

Starvation and untreated diabetes lead to increased ketone body production due to low oxaloacetate levels and increased fatty acid breakdown.

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Reduced Energy Yield (Unsaturated)

Due to the need for additional enzymes in the oxidation of unsaturated fatty acids, the total energy production is slightly lower compared to the oxidation of saturated fatty acids.

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Diabetic Ketoacidosis

A serious complication of untreated diabetes where ketone bodies accumulate, causing acidosis due to cells not effectively using the ketone bodies.

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Succinyl-CoA

A 4-carbon molecule produced from a 3-carbon fragment (propionyl-CoA) during the oxidation of odd-number fatty acids. It is an important intermediate.

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Oxaloacetate (OAA) Role

Oxaloacetate is crucial in the Citric Acid Cycle. Low OAA levels divert acetyl-CoA to ketone body production, rather than the citric acid cycle.

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Succinyl-CoA synthesis

A process that produces succinyl-CoA, a crucial intermediate.

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Methylmalonyl-CoA mutase

An enzyme that catalyzes the conversion to succinyl-CoA

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Vit B12 (Cobalamine)

A vitamin, crucial as a cofactor for methylmalonyl-CoA mutase.

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Fatty Acid Synthesis

Process of creating fatty acids from simpler molecules.

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Malonyl-CoA

Precursor molecule in fatty acid synthesis.

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Beta-oxidation inhibition

Malonyl-CoA stops transport of fatty acids into mitochondria.

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Ketone bodies

Alternative fuel source, including acetoacetate, acetone and beta-hydroxybutyrate.

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Ketoacidosis

A condition resulting from a buildup of ketone bodies.

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Fatty acid oxidation

Process of breaking down fatty acids for energy, stimulated by high glucose.

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Regulation of fatty acid oxidation

High glucose stimulates enzyme synthesis for fatty acid precursor molecule (malonyl-CoA), inhibiting beta-oxidation.

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