Lipid Metabolism: Structure, Digestion, and Biological Functions
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Questions and Answers

What stimulates the degradation of triacylglycerols to release fatty acids and glycerol?

  • Estrogen
  • Insulin
  • Epinephrine (correct)
  • Testosterone

How are fatty acids transported into the mitochondria for oxidation?

  • Via the acyl-carnitine/carnitine transporter (correct)
  • By facilitated diffusion
  • Through active transport
  • By simple diffusion

What is produced in each round of β-oxidation of fatty acids?

  • Glucose
  • Lactic acid
  • Acetyl CoA (correct)
  • Glycerol

In comparison with glucose degradation, how does β-oxidation of fatty acids produce energy?

<p>It produces a huge amount of energy (D)</p> Signup and view all the answers

What is the main function of very-low-density lipoproteins (VLDL)?

<p>Transport synthesized triglycerides (TG) from the liver to other tissues for storage or energy supply (C)</p> Signup and view all the answers

What is the primary role of low-density lipoproteins (LDL) in the body?

<p>Carry cholesterol from the liver to other tissues (C)</p> Signup and view all the answers

What is the function of high-density lipoproteins (HDL) with regards to cholesterol transport?

<p>Pick up cholesterol from extrahepatic tissues and return it to the liver (B)</p> Signup and view all the answers

What happens to triacylglycerols when the diet contains more fatty acids than are immediately needed for fuel?

<p>They are stored in adipose tissue for future energy production (D)</p> Signup and view all the answers

What is the defining feature of lipids?

<p>Insolubility in water (B)</p> Signup and view all the answers

Which type of fatty acids contains no double bonds?

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

What are the principal stored energy molecules in the body?

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

What is the precursor for steroid hormones, bile acids, and vitamin D?

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

Where do triacylglycerols from the diet form lipid droplets during digestion?

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

What type of molecule is cholesterol in terms of its polarity?

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

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