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Which of the following is a function of peroxisomes?
Option: 1
Recycling phosphoglycolate
Option: 2
Mobilization of fatty acids during the seed germination
Option: 3
Detoxification of alcohol
Option: 4
All of these
Answers (1)
MICROBODIES
These are the small, single membrane-bound cell organelles that are involved in the absorption of molecular oxygen and oxidation.
1. Peroxisomes:
- These microbodies contain enzymes for peroxide biosynthesis.
- These are present in both the plant cells and animal cells in close proximity to ER, mitochondria and chloroplasts.
- The following enzymes are present in the peroxisomes:
- Urate oxidase
- D-amino acid oxidase
- Α-hydroxy acid oxidase
- Β- hydroxy acid oxidase
- In the presence of molecular oxygen, hydrogen peroxide is formed which is metabolised by catalase enzyme.
Functions of Peroxisomes:
- Peroxisomes are mainly concerned with fatty acid metabolism.
- They carry out oxidation reactions that result in the formation of hydrogen peroxide.
- This hydrogen peroxide is used to detoxify the toxic compounds. Peroxisomes in the liver help in detoxification of alcohol.
- In plants, the peroxisomes play an important role in the mobilization of fatty acids during the seed germination. The fatty acids are converted to sugars which provide energy.
- Peroxisomes also help to recycle phosphoglycolate - a by-product of the Calvin cycle. This is a very important function as if the recycling didn't happen a lot of the cell's energy and carbon would be lost.
Peroxisomes are mainly concerned with fatty acid metabolism. They carry out oxidation reactions that result in the formation of hydrogen peroxide.
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