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Peroxisomes (MP DMAT)

Description: Proteins
Number of Questions: 15
Created by:
Tags: Peroxisomes oxidation Cellular Organelles
Attempted 0/15 Correct 0 Score 0

Which function(s) do peroxisomes perform exclusively in yeast?

  1. Glycolysis

  2. Amine oxidation and assimilation

  3. Photo-respiration

  4. Glyoxylate cycle


Correct Option: B
Explanation:

Peroxisomes perform amine oxidation and assimilation in yeast.

In yeast and plant cells, long chain fatty acids are oxidised to medium chain fatty acids and then, to CO2 and water in

  1. peroxisomes and mitochondria

  2. peroxisomes

  3. peroxisomes and cytoplasm

  4. mitochondria


Correct Option: B
Explanation:

In yeast and plant cells, long fatty acids are converted to medium chain fatty acids, which are eventually broken down to carbon dioxide and water exclusively in the peroxisomes.

Peroxisomal disorders mainly affect

  1. endocrine system

  2. circulatory system

  3. nervous system

  4. excretory system


Correct Option: C
Explanation:

In animal cells, peroxisomes are involved in synthesis of plasmalogen.

Which peroxisomal enzyme carries out per oxidation reaction?

  1. Uric acid oxidase

  2. D-amino acid oxidase

  3. Acyl CoA oxidase

  4. Catalase


Correct Option: D
Explanation:

Catalase, a peroxisomal enzyme, uses H2O2 to oxidise other substrates.

Peroxisomes play an important role in the absorption of

  1. vitamin C

  2. biotin

  3. vitamin A

  4. vitamin B1


Correct Option: C
Explanation:

Peroxisomes play an important role in absorption of vitamin A.

Which of the following anti-fungal molecules is/are made by peroxisomes to fight fungal penetration in the cell?

  1. Cerebrosides

  2. Glucosinolate

  3. Glycosides

  4. Plasmalogen


Correct Option: B
Explanation:

A Glucosinolate molecule is made by peroxisomes to fight fungal penetration in the cell.

Which of the following peroxisome oxidative enzymes is absent in humans?

  1. Uric acid oxidase

  2. D-amino acid oxidase

  3. Catalase

  4. Acyl CoA oxidase


Correct Option: A
Explanation:

Uric acid oxidase catalyses the oxidation of uric acid to 5-hydroxyisourate.

Peroxisomes differ from lysosomes in having

  1. hydrolytic enzymes

  2. oxidative enzymes

  3. single membrane

  4. ligases


Correct Option: B
Explanation:

Peroxisomes differ from lysosomes in having oxidative enzymes.

Peroxisomes are involved in the digestion of

  1. polypeptides

  2. polysaccharides

  3. fatty acids

  4. minerals


Correct Option: C
Explanation:

Peroxisomes are involved in the digestion (catabolism) of very long chain fatty acids.

Which of the following cells contain the largest number of peroxisomes?

  1. Neural cells

  2. Liver cells

  3. Blood cells

  4. Skin cells


Correct Option: B
Explanation:

The liver is the organ primarily responsible for detoxifying the blood before it travels throughout the body.

Which of the following statements about peroxisomes is not true?

  1. Peroxisomes are found in all cell types.

  2. Peroxisomes are self replicating.

  3. Peroxisomes oversee reactions that neutralise free radicals.

  4. Peroxisomes are major sites of oxygen utilisation.


Correct Option: A
Explanation:

Peroxisomes are found in all eucaryotic cells. 

Which scientist first identified peroxisomes as organelles?

  1. J. Rhodin

  2. Christian de Duve

  3. Robert Brown

  4. Ernest Fullman


Correct Option: B
Explanation:

Peroxisomes were identified as organelles by the Belgian cytologist Christian de Duve in 1967.

Peroxisomes can be derived from

  1. vacuoles

  2. golgi bodies

  3. endoplasmic reticulum

  4. lysosome


Correct Option: C
Explanation:

Peroxisomes can be derived from the endoplasmic reticulum.

Which of the following is a peroxisomal linked disorder?

  1. Leigh syndrome

  2. Myoneurogenic gastrointestinal encephalopathy

  3. Galactosialidosis

  4. X-linked adrenoleukodystrophy


Correct Option: D
Explanation:

X-linked adrenoleukodystrophy is a peroxisomal disorder. 

Which process is crucial for the export of PEX5 (a peroxin) from peroxisome to cytosol?

  1. ATP hydrolysis

  2. Ubiquitination

  3. Mannose tagging

  4. Oxidation


Correct Option: B
Explanation:

Ubiquitination appears to be crucial for the export of PEX5.

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