Q. No.An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called:
1. Endoplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid
1. Endoplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid
Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with:
Components :
(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Cell vacuole
(viii) Nucleus
The correct components are:
| A | B | C | D | |
| 1. | (i) | (iv) | (viii) | (vi) |
| 2. | (vi) | (v) | (iv) | (vii) |
| 3. | (v) | (i) | (iii) | (ii) |
| 4. | (v) | (iv) | (viii) | (iii) |
Which one of the following is not considered as a part of the endomembrane system?
| 1. | Lysosome | 2. | Golgi complex |
| 3. | Peroxisome | 4. | Vacuole |
The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function.
| 1. | Part (A) : Matrix – a major site for respiratory chain enzymes |
| 2. | Part (D) : Outer membrane – gives rise to the inner membrane by splitting |
| 3. | Part (B) : Inner membrane – forms infoldings called cristae |
| 4. | Part (C) : Cristae – possess single circular DNA molecule and ribosome |
1. Peroxisome
2. ER
3. Mesosome
4. Ribosome
Which one of the following cellular parts is correctly described?
| 1. | Centrioles - sites for active RNA synthesis |
| 2. | Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s) |
| 3. | Lysosomes - optimally active at a pH of about 8.5 |
| 4. | Thylakoids - flattened membranous sacs forming the grana of chloroplasts |
| 1. | Mitochondria - produce cellular energy in the form of ATP |
| 2. | Golgi body - provides packaging material |
| 3. | Lysosomes - secrete hydrolytic enzymes |
| 4. | Endoplasmic reticulum - synthesis of lipids |
1. Chromoplasts
2. Eleioplasts
3. Aleuroplasts
4. Amyloplasts
| 1. | a layer present between cell wall and membrane of bacteria |
| 2. | cell wall of bacteria |
| 3. | bacterial cell glyco-engineered to possess N-glycosylated proteins |
| 4. | a layer surrounding the cell wall of bacteria |
Which of the following statements regarding cilia is not correct?
| 1. | The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane |
| 2. | Cilia are hair-like cellular appendages |
| 3. | Microtubules of cilia are composed of tubulin |
| 4. | Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules |
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