Q. No.Which of the following statement about cilia is not correct?
1. Organised beating of cilia is controlled by fluxes of Ca2+ across the membrane.
2. Cilia are hair like cellular appendages.
3. Cilia contain an outer ring of nine doublet microtubules surrounding two singlet microtubules.
4. Microtubules of cilia are composed of tubulin.
1. Organised beating of cilia is controlled by fluxes of Ca2+ across the membrane.
2. Cilia are hair like cellular appendages.
3. Cilia contain an outer ring of nine doublet microtubules surrounding two singlet microtubules.
4. Microtubules of cilia are composed of tubulin.
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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 |
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 |
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) |
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 Nicholson | Fluid mosaic model |
| 4. | Georges Palade | First observed ribosome |
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