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Peroxisomes: Structure and Function

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Questions and Answers

What is the primary function of peroxisomes in a cell?

To rid the cell of toxic peroxides (correct)

To participate in the secretory pathway

To generate energy for the cell

To synthesize proteins

What is the structure of the peroxisome membrane?

Single lipid bilayer (correct)

Double lipid bilayer

Protein-based membrane

Carbohydrate-based membrane

Where do peroxisomes bud from?

Endoplasmic reticulum (correct)

Mitochondria

Lysosomes

Golgi apparatus

What type of fatty acid oxidation occurs in peroxisomes?

Beta-oxidation (B) Signup and view all the answers

How do peroxisomes replicate?

By enlarging and then dividing (C) Signup and view all the answers

What is the number of genes involved in the synthesis of peroxisomes?

12 genes (A) Signup and view all the answers

What is the function of catalase in the peroxisome?

To convert hydrogen peroxide into water (D) Signup and view all the answers

In which cells does beta-oxidation occur exclusively in the peroxisome?

Yeast and plant cells (D) Signup and view all the answers

What is the product of the oxidative reaction in the peroxisome?

Hydrogen peroxide (C) Signup and view all the answers

What is the function of the peroxisome in liver and kidney cells?

To detoxify various toxic substances (B) Signup and view all the answers

What is the name of the reaction in which hydrogen peroxide is converted into water?

Perooxidation reaction (A) Signup and view all the answers

What is the name of the most abundant phospholipid in myelin, which is formed in the peroxisome?

Plasmalogen (D) Signup and view all the answers

What is the mechanism of protein import into peroxisomes?

A peroxisome targeting signal binds to a soluble receptor protein in the cytosol (D) Signup and view all the answers

What is the result of the failure to metabolize fatty acids properly in X-ALD?

Deterioration of the myelin sheaths of neurons (A) Signup and view all the answers

What is the function of glyoxysomes in plants?

To break down fatty acids (B) Signup and view all the answers

What is a common feature of all peroxisome disorders?

Mutant versions of enzymes found within peroxisomes (A) Signup and view all the answers

What is the location of the receptor protein that binds to the peroxisome targeting signal?

Peroxisome membrane (D) Signup and view all the answers

What is the function of peroxisomes in the synthesis of myelin?

To participate in the synthesis of lipids (B) Signup and view all the answers