Peroxisomes Function and Lipid Biosynthesis Quiz
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Questions and Answers

What is the main function of peroxisomes in plants found in leaves?

  • Break down fatty acids into acetyl CoA
  • Convert stored fatty acids in seeds into sugars
  • Play a role in photorespiration by using up O2 and liberating CO2 (correct)
  • Catalyze the conversion of fats into sugars using the glyoxylate cycle

What distinguishes glyoxysomes from regular peroxisomes in plants?

  • Their role in converting lipids into sugars during seed germination (correct)
  • The presence of rubisco enzyme
  • Their ability to store lipids
  • The absence of the glyoxylate cycle

What is the significance of the glyoxylate cycle in plants?

  • It allows for the breakdown of glucose into succinic acid
  • It catalyzes the breakdown of peroxisomes
  • It converts acetyl CoA into fatty acids
  • It enables the conversion of stored lipids into sugars for growth (correct)

Why are animals unable to convert fatty acids into carbohydrates like plants do?

<p>The glyoxylate cycle is not present in animal cells (C)</p> Signup and view all the answers

What is the primary function of rubisco enzyme in plant metabolism?

<p>Convert O2 into CO2 during photosynthesis (C)</p> Signup and view all the answers

In what process does rubisco sometimes add O2 instead of CO2?

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

What is a major function of the oxidative reactions carried out in peroxisomes?

<p>Breakdown of fatty acid molecules by beta oxidation (A)</p> Signup and view all the answers

In which cellular component are cholesterol and dolichol synthesized in animal cells?

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

Where are plasmalogens important membrane components found, particularly in the body?

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

What is a family of phospholipids in which one of the hydrocarbon chains is joined to glycerol by an ether bond?

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

What is the process by which fatty acid molecules are shortened sequentially by blocks of two carbon atoms at a time in peroxisomes?

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

Which cells exclusively carry out beta oxidation in peroxisomes rather than mitochondria?

<p>Yeast and plant cells (A)</p> Signup and view all the answers

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