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

In plant cells, peroxisomes are associated with

  1. Photorespiration

  2. Phototropism

  3. Photoperiodism

  4. Photosynthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • In plant cells, peroxisomes are associated with photorespiration.
  • Peroxisomes (microbody) are small organelle which contains reducing and oxidising enzyme catalase.
  • It helps in the breakdown of long chain fatty acids through beta-oxidation and converts them into to medium chain fatty acids, which are subsequently broken down to carbon dioxide and water in the mitochondria (photorespiration).
  • So, the correct answer is 'Photorespiration'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Out of peroxisomes, lysosomes and mitochondria, single membrane covering occurs in

  1. Both peroxisomes and lysosomes

  2. Only peroxisomes

  3. All of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • A lysosome is a single membrane-bound organelle which contains digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
  • The peroxisome is a single membrane-bound organelle which contains oxidative enzymes and is responsible for lipid production and oxidation reactions within the cell.
  • Whereas, mitochondria is a double membrane-bound organelle and is known as the powerhouse of the cell which is present in all eukaryotic cells.
  • So, the correct answer is 'Both peroxisomes and lysosomes'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Peroxisomes occur in

  1. Bundle sheath

  2. Vascular bundles

  3. Mesophyll cells

  4. Endosperm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The peroxisome is a single membrane-bound organelle which contains oxidative enzymes and is responsible for lipid production and oxidation reactions within the cell.
  • Peroxisomes are present in the photosynthetic cells of green plants (palisade cells of C3 plants and bundle sheath cells of C4 plants).
  • So, the correct answer is 'Bundle sheath'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Scientist credited with discovery of sphaerosome is

  1. Rhodin

  2. Perner

  3. Koltzoff

  4. Claude.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Spherosomes or oleosomes can be defined as small cellular organelles found in plant cells that are enclosed by a single membrane. 
  • It is mainly responsible for the storage and synthesis of lipid. 
  • It was discovered by Perner in the year 1953.
  • They are obtained from the endoplasmic reticulum and are surrounded by a phospholipid monolayer.
  • So, the correct answer is 'Perner'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Microbody present only in plants is

  1. Sphaerosome

  2. Peroxisome

  3. Glyoxysome

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Microbodies or cytosomes can be defined as cellular organelle found in the plant cells, protozoans and animal cells (liver and kidney cells).
  • The different types of microbodies present within a cell are peroxisomes, glyoxysomes, glycosomes and hydrogenosomes.
  • The main function of microbodies is oxidation of fatty acids, amino acids, purines and alcohol (liver cells) which requires significant amounts of oxygen.
  • Glyoxysomes are found only in plants cells in fat storage tissues of germinating seeds and in filamentous fungi.
  • So, the correct answer is 'Glyoxysome'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Spherosomes are involved in

  1. Utilisation of alcohol

  2. Storage of fat

  3. Synthesis and storage of fat

  4. Synthesis and storage of carbohydrates
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Spherosomes or oleosomes can be defined as small cellular organelles found in plant cells that are enclosed by a single membrane. 
  • It is mainly responsible for the storage and synthesis of lipid. 
  • The lipid content in spherosomes is 98% and proteins content is only 2 %.
  • They are obtained from the endoplasmic reticulum and are surrounded by a phospholipid monolayer.
  • So, the correct answer is 'Synthesis and storage of fat'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Microbodies resemble mitochondria in 

  1. Using oxygen

  2. Producing reducing power

  3. Having catalase

  4. Formation of ATP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Microbodies or cytosomes can be defined as cellular organelle found in the plant cells, protozoans and animal cells (liver and kidney cells).
  • The different types of microbodies present within a cell are peroxisomes, glyoxysomes, glycosomes and hydrogenosomes.
  • The main function of microbodies is oxidation of fatty acids, amino acids, purines and alcohol (liver cells) which requires significant amounts of oxygen.
  • Mitochondria are double membrane-bound cellular organelles which are known as the powerhouse of the cell.
  • It creates energy-rich molecules (ATP) for the cell by utilizing oxygen. 
  • So, the correct answer is 'Using oxygen'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

New spherosomes develop from

  1. Old sphaerosomes

  2. E.R.

  3. Golgi apparatus

  4. Prospherosomes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Spherosomes or oleosomes can be defined as small cellular organelles found in plant cells that are enclosed by a single membrane. 
  • It is mainly responsible for the storage and synthesis of lipid. 
  • They arise from the endoplasmic reticulum and are enclosed by a phospholipid monolayer.
  • So, the correct answer is 'E.R'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Organelle covered by a single membrane is

  1. Sphaerosomes

  2. Peroxisomes

  3. Glyoxisomes

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. Spherosomes or oleosomes can be defined as small cellular organelles found in plant cells that are enclosed by a single membrane. 

B. The peroxisome is a single membrane-bound organelle which contains oxidative enzymes and is responsible for lipid production and oxidation reactions within the cell.
C. Glyoxysomes are specialized peroxisomes found only in plants cells in fat storage tissues of germinating seeds and in filamentous fungi.
So, the correct answer is 'All of the above'.

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

Enzyme catalase occurs in

  1. Lysosome

  2. Sphaerosome

  3. Peroxisome

  4. Peroxisome and glyoxysome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The enzyme catalase occurs in Peroxisome and glyoxysome.
  • The enzyme catalase is found all living organisms such as bacteria, plants, and animals.
  • Its main function is to catalyze the breakdown of hydrogen peroxide into water and oxygen and thus, protects the cell from oxidative damage from reactive oxygen species.
  • The peroxisome is a single membrane-bound organelle which contains oxidative enzymes and is responsible for lipid production and oxidation reactions within the cell.
  • Similarly, glyoxysome is specialized peroxisome which is found in fat storage tissues of germinating seeds.
  • So, the correct answer is 'Peroxisome and glyoxysome'.