MCQs on Peroxisomes for NEET 2020

The cytoplasm of several cells have tiny organelles found in the cytoplasm containing the reducing enzyme catalase and typically a few oxidases, which are peroxisomes. The enzymes contained in peroxisomes(as many as 50 different enzymes) are vastly involved in many metabolic reactions which cover various facets of energy metabolism. Morphologically, they are similar to lysosomes, are gathered like chloroplasts and mitochondria from proteins synthesized on free ribosomes and then brought into peroxisomes as polypeptide chains that are completed.

1. These activities are characteristics of peroxisomes

I. Catalase activity

II. Possess a glyoxylate cycle

III. Degradation of very long chain fatty acids

IV. Produce dihydrogen

(a) I and II

(b) I and III

(c) III and IV

(d) II and IV

Answer: (b)

2. Pick the odd one out in context of their surrounding membrane systems

(a) Mitochondria

(b) Chloroplasts

(c) Endoplasmic reticulum

(d) Nucleus

Answer: (c)

3. Pick the odd one out

(a) Glycosomes

(b) Mitochondria

(c) Hydrogenosomes

(d) Mitosomes

Answer: (a)

4. This organelle is involved in lipid metabolism

(a) RER

(b) SER

(c) Golgi apparatus

(d) Peroxisomes

Answer: (b)

5. The organelle helping in penetrating of sperm into egg during fertilization is

(a) peroxisome

(b) nucleus

(c) lysosome

(d) mitochondrion

Answer: (c)

6. Inside the cell, H2O2 clearance is brought about by

(a) Peroxisome with enzyme amino oxidase

(b) Glyoxysome with enzyme catalase

(c) Peroxisome with enzyme catalase

(d) Glyoxysome with enzyme isocitrate lyase

Answer: (c)

7. Organelle – Glyoxysomes is involved in

(a) conversion of fatty acids to lipids

(b) conversion of amino acids to carbohydrates

(c) conversion of fatty acids to carbohydrates

(d) conversion of amino acids to proteins

Answer: (c)

8. This forms the crystalline core inside peroxisome

(a) condensed ammonium chloride

(b) salt crystals

(c) highly condensed oxidative enzymes

(d) collection of phospholipids

Answer: (c)

9. The name of the group of proteins in the peroxisomal membrane is

(a) Peroxins

(b) Transporters

(c) Translocation proteins

(d) Peroxisomal membrane proteins

Answer: (a)

10. This enzyme embedded in the peroxisomal membrane is responsible to activate fatty acids before undergoing beta-oxidation.

(a) Fatty acid dehydrogenase

(b) 3-ketothiolase

(c) Acyl- CoA oxidase

(d) Acyl – CoA synthase

Answer: (d)

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