Tag: structure and function of cell organelles

Questions Related to structure and function of cell organelles

Glycolate cycle occurs in?

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

  1. Lysosomes

  2. Ribosomes

  3. Glyoxysomes

  4. Peroxisomes

Show answer
Correct Option: C
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.

Which one of these is not correct regarding peroxisomes?

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

  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 ${H} _{2}{O} _{2}$

Show answer
Correct Option: C
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'.

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

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

  1. Glyoxysomes

  2. Peroxisomes

  3. Sphaerosomes

  4. Lysosomes

Show answer
Correct Option: A
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.