Tag: biology

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Multiple choice biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

Select the set of cell organelles that are the part of endomembrane system:
(i) Endoplasmic reticulum
(ii) Golgi body
(iii) Mitochondria
(iv) Chloroplast
(v) Microbodies
(vi) Lysome
(vii) Vacuole.

  1. i, ii, iii, v, vi

  2. i, iv, vi, vii

  3. ii, v, vi, vii

  4. i, ii, vi, vii
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The endomembrane system includes organelles whose functions are coordinated, specifically the endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles. Mitochondria and chloroplasts are semi-autonomous and not part of this system.

Multiple choice biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

Which is wrong

  1. Both chloroplast and mitochondrion has an internal compartment or thylakoid space bounded by thylakoid membrane

  2. Both contain DNA

  3. Chloroplast is generally larger

  4. Both are covered by double membrane.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chloroplasts have thylakoids, but mitochondria do not. Mitochondria have cristae, which are folds of the inner membrane, not thylakoids.

Multiple choice biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

How does a cell rid itself of defective or malfunctioning organelles?

  1. They are engulfed by plastids and stored until export from cell is possible

  2. Defective parts accumulate until the cell itself dies

  3. They are exported by exocytosis

  4. Lysosomes assist in the removal of defective organelles by digesting them
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The lysosomes may be called "suicide bags" of the cell in view of their autolytic role, or "disposal units" of the cell because they digest the incoming food materials and remove the foreign bodies, toxic molecules, and debris; or "recycling centres" as they break down warn out and defective cells and cell organelles to component molecules for building new organelles and cells.

Multiple choice biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

Cell cultures of Lithospermum erythrorhizon are being used commercially for preparing.

  1. Berberine

  2. Plamitine

  3. Shikonin

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

Cell cultures of Lithospermum erythrorhizon are widely used in biotechnology for the commercial production of shikonin, a red naphthoquinone pigment with medicinal and dye properties.

Multiple choice biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

Rapid and irreversible cell elongation occurs commonly in plants but not in animals. This difference is due to the.

  1. Presence of chloroplasts and mitochondria

  2. Absence of centrioles and Golgi bodies

  3. Absence of endoplasmic reticulum and presence of large vacuoles

  4. Presence of large vacuoles and cell walls
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rapid and irreversible cell elongation in plants is enabled by the presence of large central vacuoles exerting turgor pressure and rigid cell walls that direct expansion, a combination absent in animal cells.