Tag: microbodies

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Questions Related to microbodies

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

In which type of reactions related to plant photosynthesis peroxisomes are involved?

  1. Glycolate cycle

  2. Calvin cycle

  3. Bacterial photosynthesis

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

Glycolate cycle, also known as C$ _2$ cycle, is a complex metabolic pathway, that takes place in chloroplasts, mitochondria and peroxisomes of plant cells and is responsible for the formation of the amino acids, serine and glycine from non-phosphorylated intermediates of the carbon reduction cycle of photosynthesis.

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

Spherosomes have affinity for

  1. Sudan III

  2. Eosin stains

  3. Leishman's stain

  4. Giemsa's stains
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sudan stains have high affinity for fats, lipids, triglycerides and lipoprotein. Hence, when a cell is exposed to Sudan stain, it becomes attached to spherosomes because spherosomes are membrane covered small spherical organelles which synthesize and store fats.

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'.