Q. No.An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called -
1. Endosplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid
1. Endosplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid
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The chromosomes in which centromere is situated close to one end are
| 1. | metacentric | 2. | acrocentric |
| 3. | telocentric | 4. | sub-metacentric |
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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) |
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| 1. | Golgi apparatus and Vacuole |
| 2. | Endoplasmic reticulum and Golgi apparatus |
| 3. | Plastids and mitochondria |
| 4. | Nucleolus and ribosomes |
| I: | The lipid content mainly is phosphoglycerides |
| II: | Proteins can move laterally within the overall bilayer |
| III: | The membrane is selectively permeable |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
| 1. | Golgi apparatus | Formation of glycoproteins and glycolipids |
| 2. | Rough ER | Synthesis of steroidal hormones in animal cells |
| 3. | Lysosomes | Carry acid hydrolases |
| 4. | Nucelolus | Site for active rRNA synthesis |
| 1. | presence of ribosomes |
| 2. | arising from pre-existing cells |
| 3. | compartmentalization through membrane bound organelles |
| 4. | presence of a cell membrane |
| 1. | Lysosomes | Acid hydrolases |
| 2. | Tonoplast | Membrane of vacuole |
| 3. | Amyloplasts | Store oils and fats |
| 4. | Golgi apparatus | Synthesis of glycoproteins and glycolipids |
| 1. | Linus Pauling | Discovered the triple helix structure of collagen |
| 2. | Rudolf Virchow | Omnis cellula-e-cellula |
| 3. | Singer and Nicolson | Fluid mosaic model |
| 4. | Georges Palade | First observed ribosome |
| 1. | They are differentiated form of cell membrane |
| 2. | They are essentially infoldings of cell membrane |
| 3. | They can be in the form of vesicles, tubules and lamellae |
| 4. | They contain photosynthetic pigments |
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