The cytoplasm of several cells is composed of tiny organelles, containing the reducing enzyme catalase and typically a few oxidases, which are peroxisomes. These reducing enzymes contained in peroxisomes (as many as 50 different enzymes) are vastly and involved in many metabolic reactions, which cover various facets of energy metabolism. Morphologically, they are similar to lysosomes and are gathered similar to chloroplasts and mitochondria from proteins synthesized on free ribosomes and then are brought into peroxisomes as polypeptide chains that are completed.
Lister below is a few important MCQs on Peroxisomes.
1. Which of the following 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 the context of their surrounding membrane systems.
(a) Nucleus
(b) Chloroplasts
(c) Mitochondria
(d) Endoplasmic reticulum
Answer: (d)
3. Pick the odd one out.
(a) Mitosomes
(b) Glycosomes
(c)Â Mitochondria
(d)Â Hydrogenosomes
Answer: (a)
4. Which of the following organelle is involved in lipid metabolism?
(a) RER
(b) SER
(c) Peroxisomes
(d)Â Golgi apparatus
Answer: (b)
5. Which of the following organelle helps in the penetration of sperm into the egg during fertilization?
(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 the enzyme catalase
(c) Peroxisome with the 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 proteins
(c)Â Conversion of amino acids to carbohydrates
(d) Conversion of fatty acids to carbohydrates
Answer: (d)
8. _______ forms the crystalline core inside the peroxisome.
(a) Salt crystals
(b)Â collection of phospholipids
(c) highly condensed oxidative enzymes
(d) Condensed ammonium chloride
Answer: (c)
9. What is the group of proteins in the peroxisomal membrane called?
(a) Peroxins
(b) Transporters
(c) Translocation proteins
(d) Peroxisomal membrane proteins
Answer: (a)
10. Which of the following embedded enzyme in the peroxisomal membrane is involved to in the activation of fatty acids before the beta-oxidation?
(a) Fatty acid dehydrogenase
(b) 3-ketothiolase
(c) Acyl- CoA oxidase
(d) Acyl – CoA synthase
Answer: (d)
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