Tag: single membrane bound organelles

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

Peroxisome is the microbody of a cell that helps in

  1. Removal of electrons and associated hydrogen

  2. Removal of proton

  3. Conversion of carbohydrate into fat

  4. Conversion of carbohydrate into protein
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.
  • It contains the enzyme called catalase.
  • 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.
  • So, the correct answer is 'Removal of electrons and associated hydrogen'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Match the columns:

Column I Column II
(a) Endoplasmic reticulum (i) Stack of cisternae
(b) Sphaerosome (ii) Store oil
(c) Dictyosomes (iii) Synthesis and storage of lipids
(d) Peroxisomes (iv) Photorespiraton
(e) Elaioplasts (v) Detoxification of drugs

  1. a-v, b-iii, c-i, d-iv, e-ii

  2. a-v, b-iii, c-ii, d-iv, e-i

  3. a-ii, b-iii, c-i, d-iv, e-v

  4. a-iii, b-iv, c-i, d-v, e-ii

  5. a-iii, b-v, c-i, d-iv, e-ii.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Matching: (a) Endoplasmic reticulum-v (detoxification), (b) Sphaerosome-iii (lipid synthesis/storage), (c) Dictyosomes-i (stack of cisternae), (d) Peroxisomes-iv (photorespiration), (e) Elaioplasts-ii (store oil). Option A matches these correctly.

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

Which one does not contain DNA?

  1. Peroxisome

  2. Nucleus

  3. Chloroplast

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

Peroxisome  are surrounded by only a single membrane, and they do not contain DNA or ribosomes. Like mitochondria and chloroplasts, however, peroxisomes are thought to acquire their proteins by selective import from the cytosol. But because they have no genome, all of their proteins must be imported.


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

An oxidative organelle is

  1. Ribosome

  2. Golgi body

  3. Peroxisome

  4. ER
Reveal answer Fill a bubble to check yourself
C 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.
  • It helps in the oxidation of fatty acids, amino acids, purines and alcohol (liver cells) which requires significant amounts of oxygen.
  • So, the correct answer is 'Peroxisome'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

In which of the following would you expect to find glyoxysomes?

  1. Endosperm of wheat

  2. Endosperm of castor

  3. Palisade cell in leaf

  4. Root hairs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The endosperm of castor (castor bean is oil producing plant)  contains 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 'Endosperm of castor'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

The function of glyoxysome is

  1. Protein metabolism

  2. Carbohydrate metabolism

  3. Fat metabolism

  4. Protein synthesis
Reveal answer Fill a bubble to check yourself
C Correct answer
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 germinating endosperm cells of oil seeds.
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

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

  1. Glyoxysomes

  2. Peroxisomers

  3. Sphaerosomes

  4. Lysosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
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 germinating endosperm cells of oil seeds.
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

Which one of these is not correct regarding peroxisomes?

  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 $H _{2}O _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
SER takes part in 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 $H _{2}O _{2}$.
So, the correct answer is 'Take part in synthesis and storage of lipids'.
Multiple choice bio-chemistry structure and function of cell organelles microbodies living organisms and energy production single membrane bound organelles

Which of the following statements regarding spherosomes is not correct?

  1. Abundant in the endosperm cells of oil seeds

  2. Bounded by a single membrane

  3. Take part in synthesis and storage of lipids

  4. Take part in photorespiration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Sphaerosomes are small cell organelles bounded by single membrane which take part in storage and synthesis of lipids. Sphaerosomes occur abundantly in the endosperm cells of oil seeds. Sphaerosomes of some tissues (e.g., tobacco endosperm, maize root tip) contain hydrolytic enzymes. Therefore, they are considered to have lysosomic activity. They donot take part in photorespiration.
So, the correct answer is 'Take part in photorespiration'.