Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

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

Peroxisomes are commonly seen in 

  1. Bundle sheath cells

  2. Vascular bundles

  3. Mesophyll cells

  4. Endopserm cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Peroxisomes are present in the photosynthetic mesophyll cells of leaves. They play an important role in photorespiration. They maintain redox balance in cells and play a role in plant immune defence. Thus 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 of the following is covered by a single membrane?

  1. Nucleus

  2. Mitochondria

  3. Plastids

  4. Sphaerosomes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Sphaerosome is a cellular organelle enclosed by a single membrane which is only found in plant cells.
  • It helps in storage and synthesis of lipid.
  • They are formed from the endoplasmic reticulum.
  • All the other cellular organelle nucleus, mitochondria and plastids are enclosed by a double membrane.
  • So, the correct answer is 'Spherosomes'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Enzymes associated with converting fats to carbohydrates are located in

  1. Liposomes

  2. Golgi bodies

  3. Glyoxysomes

  4. Microsomes
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Glyoxysomes are connected with metabolism of

  1. Fats

  2. Proteins

  3. Carbohydrates

  4. All the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

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

  1. Glyoxysome

  2. Sphaerosome

  3. Peroxisome

  4. Mitochondrion
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Cell organelle covered by a single unit membrane is

  1. Glyoxysome

  2. Lysosome

  3. Peroxisome

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

What is not true of sphaerosomes?

  1. Single membrane covering

  2. Connected with fats

  3. Arise from endoplasmic reticulum

  4. Involved in photorespiration
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Which organelle is present only in plants?

  1. Glyoxysome

  2. Lysosome

  3. Peroxisome

  4. Ribosome
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
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'.