Tag: single membrane bound organelles

Questions Related to single membrane bound organelles

Enzymes associated with converting fats to carbohydrates are located in

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

  1. Liposomes

  2. Golgi bodies

  3. Glyoxysomes

  4. Microsomes

Show answer
Correct Option: C
Explanation:
  • Enzymes associated with converting fats to carbohydrates are located in Glyoxysomes.
  • Glyoxysomes are a type of peroxisomes found in plants and few filamentous fungi.
  • They are particularly found in fat storage tissues of germinating seeds (peanuts, soybeans etc.) in plants.
  • They contain enzymes (citrate synthase, isocitrate lyase and malate synthase etc.) which are responsible for beta-oxidation of fatty acids,
  • It helps in fatty acid oxidation, glyoxylate cycle and gluconeogenesis.
  • So, the correct answer is 'Glyoxysomes'.

Glyoxysomes are connected with metabolism of

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

  1. Fats

  2. Proteins

  3. Carbohydrates

  4. All the above.

Show answer
Correct Option: A
Explanation:
  • Glyoxysomes are a type of peroxisomes found in plants and few filamentous fungi.
  • They are particularly found in fat storage tissues of germinating seeds (peanuts, soybeans etc.) in plants.
  •  They contain enzymes (citrate synthase, isocitrate lyase and malate synthase etc.) which are responsible for beta-oxidation of fatty acids,
  • It helps in fatty acid oxidation, glyoxylate cycle and gluconeogenesis.
  • So, the correct answer is 'Fats'.

The organelle present in germinating seeds and connected with $\beta$-oxidation or fat digestion is

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

  1. Glyoxysome

  2. Sphaerosome

  3. Peroxisome

  4. Mitochondrion

Show answer
Correct Option: A
Explanation:
  • The organelle present in germinating seeds and connected with β-oxidation or fat digestion is glyoxysome.
  • Glyoxysomes are a type of peroxisomes found in plants and few filamentous fungi.
  • They are particularly found in fat storage tissues of germinating seeds (peanuts, soybeans etc.) in plants.
  • They contain enzymes (citrate synthase, isocitrate lyase and malate synthase etc.) which are responsible for beta-oxidation of fatty acids,
  • It helps in fatty acid oxidation, glyoxylate cycle and gluconeogenesis.
  • So, the correct answer is 'Glyoxysome'.

Cell organelle covered by a single unit membrane is

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

  1. Glyoxysome

  2. Lysosome

  3. Peroxisome

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Unit membrane refers to the limiting membrane of cells and cellular organelles which is composed of 3-layered structure- an inner lipid layer and two outer protein layers.
  • This unit membrane surrounds most of the cellular organelles (Golgi apparatus, glyoxysome, lysosomes, peroxisomes etc.).
  • Lysosomes, glyoxysomes and peroxisomes are single-membraned cellular organelles.
  • So, the correct answer is 'All of the above'.

What is not true of sphaerosomes?

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

  1. Single membrane covering

  2. Connected with fats

  3. Arise from endoplasmic reticulum

  4. Involved in photorespiration

Show answer
Correct Option: D
Explanation:
  • Spherosomes or oleosomes are small cellular organelles enclosed by a single membrane that is responsible for the storage and synthesis of lipid. 
  • They are obtained from the endoplasmic reticulum, they are surrounded by a single phospholipid monolayer and are found in only plant cells.
  •  So, the correct answer is 'Involved in photorespiration'.

Which organelle is present only in plants?

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

  1. Glyoxysome

  2. Lysosome

  3. Peroxisome

  4. Ribosome

Show answer
Correct Option: A
Explanation:
  • Glyoxysome is a type of peroxisome found in plants cells.
  • It is mainly found in the cells of fat storing tissues of germinating seeds and is also present in filamentous fungi.
  • The growing seed or the seedling utilizes the sugars synthesized from fats until it attains maturity (produce them by photosynthesis after maturity).
  • So, the correct answer is 'Glyoxysome'.

In plant cells, peroxisomes are associated with

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

  1. Photorespiration

  2. Phototropism

  3. Photoperiodism

  4. Photosynthesis

Show answer
Correct Option: A
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'.

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

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

  1. Both peroxisomes and lysosomes

  2. Only peroxisomes

  3. All of the above

  4. None of the above

Show answer
Correct Option: A
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'.

Peroxisomes occur in

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

  1. Bundle sheath

  2. Vascular bundles

  3. Mesophyll cells

  4. Endosperm

Show answer
Correct Option: A
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'.

Scientist credited with discovery of sphaerosome is

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

  1. Rhodin

  2. Perner

  3. Koltzoff

  4. Claude.

Show answer
Correct Option: B
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'.