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) |
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 |