Tag: microbodies

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Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Read the given statements and select the correct option.


Statement 1: Peroxisomes are involved in photorespiration of the plant cells and help in the lipid metabolism of animal cells.
Statement 2: They are the cell's garbage disposal system.

  1. Both statements 1 and 2 are correct

  2. Statement 1 is correct but statement 2 is incorrect

  3. Statement 2 is correct but statement 2 is incorrect

  4. Both statements 1 and 2 are incorrect
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Peroxisomes are found in photosynthetic cells and perform photorespiration. They also take part in lipid metabolism. Lysosomes are the cell's garbage disposal system and not the peroxisomes.

So, Statement 1 is correct and statement 2 is incorrect.

Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Glycolate cycle occurs in?

  1. Lysosomes

  2. Ribosomes

  3. Glyoxysomes

  4. Peroxisomes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In plants, the glyoxylate cycle occurs in specialized cells called glyoxysomes. During germination, the seeds used lipids as the energy source to form the shoot. Acetyl CoA proceeds through glyoxylate cycle and released succinate as the end product. This cycle occurs only in glyoxysomes, which are lying in the fat storage tissues of germinating seeds. 

Hence, the correct answer is option C.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Which one of these is not correct regarding peroxisomes?

  1. Single membrane bound organelles
  2. Perform photorespiration in ${C} _{3}$ plants

  3. Take part in synthesis and storage of lipids
  4. Protect a cell from the toxic effects of ${H} _{2}{O} _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
SER takes part in the synthesis and storage of lipids. Peroxisomes are the single membrane bound cell organelles, which perform photorespiration in association with chloroplasts and mitochondria. They protect the cell from the toxic effects of $H2 _O$. 
So, the correct answer is 'Take part in the synthesis and storage of lipids'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

_______ are the microbodies, which take part in glyoxylate pathway, bounded by a single membrane and are usually present in germinating fatty seeds.

  1. Glyoxysomes

  2. Peroxisomes

  3. Sphaerosomes

  4. Lysosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glyoxysomes are microbodies which contain enzymes for $\beta$-oxidation of fatty acids and glyoxylate pathway. They are considered to be special peroxisomes. They occur abundantly in gerrminating endosperm cells of oil seeds.