Assertion : Glyoxysomes contain enzymes for B-oxidation of fatty acids and glyoxylate pathway.
Reason: These are found in germinating seeds, especially in germinating fatty seeds.
O Both assertion and reason are true and reason is the correct explanation of assertion
O Both assertion and reason are true but reason is not the correct explanation of assertion
O Assertion is true and reason is false O Assertion is false and reason is true
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Answer:
both the assertion and reason is true and the reason is the correct explaination of assertion
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Both assertion and reason are true.
- Glyoxysomes are transient in the sense that they appear during brief intervals in a plant's life cycle, such as when certain beans and nuts store fats in their seeds as energy reserves.
- Glyoxysomes emerge in endosperm cells a few days after seed germination and are strongly associated with lipid structures.
- After the stored lipids are broken down and turned to glucose, they vanish.
- As a result, the emergence of these organelles appears to correspond to the conversion of lipids to carbohydrates during seed germination.
- The fatty acid oxidation and glyoxylate pathway enzymes are found in the glyoxysomes.
- In the lipid bodies, storage lipids are first broken down into glycerol and fatty acids.
- Long-chain fatty acids enter the glyoxysomes and are converted to acetyl-CoA by the -oxidation process.
- Citrate synthetase converts acetyl-CoA to citric acid from oxaloacetate and acetyl-CoA, which is subsequently converted to isocitrate by aconitase in the glyoxylate pathway, which includes several TCA cycle events.
- As a result, the glyoxysomes of higher plants are the sites of fatty acid -oxidation and glyoxylate cycle enzymes.
- Succinate is the final product of fatty acid glyoxysomal metabolism and is not further degraded in this organelle.
- It's thought that the succinate diffuses out and gets transformed to oxaloacetate in the mitochondria.
- Gluconeogenesis produces glucose in the cytoplasm.
- Fat to glucose conversion is specific to glyoxysomes and so does not occur in mammals.
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