I: | is an important site of formation of glycoproteins and glycolipids. |
II: | is not a part of the endomembrane system of a eukaryotic cell. |
Statement I: | The content of nucleolus is continuous with the rest of the nucleoplasm as it is not a membrane bound structure. |
Statement II: | The outer nuclear membrane usually remains continuous with the endoplasmic reticulum but does not bear ribosomes on it. |
1. | contains water, sap, excretory product and other materials not useful for the cell. |
2. | store enzymes capable of digesting carbohydrates, proteins, lipids and nucleic acids. |
3. | are formed by engulfing the food particles. |
4. | are important for osmoregulation and excretion. |
Statement I: | Mature sieve tube elements of vascular plants and mature human erythrocytes are not considered as ‘living’ cells. |
Statement II: | Mature sieve tube elements of vascular plants and mature human erythrocytes lack a nucleus. |
The arrangement of axonemal microtubules in cilia and flagellum is referred to as 9 + 2 array which essentially means that the axoneme has:
1. | nine doublets of radially arranged peripheral microtubules and two doublets of centrally located microtubules enclosed by a central sheath. |
2. | nine triplets of radially arranged peripheral microtubules and a pair of centrally located microtubules enclosed by a central sheath. |
3. | nine triplets of radially arranged peripheral microtubules and a centrally located protein hub not enclosed by a central sheath. |
4. | nine doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules enclosed by a central sheath. |
Identify the correctly matched pairs:
I: | Anton Von Leeuwenhoek | first saw and described a live cell |
II: | Robert Brown | discovered the nucleus |
III: | Matthias Schleiden | was a German zoologist |
IV: | Theodor Schwann | was a British botanist |
1. Only I and II
2. Only I and III
3. I, II, III and IV
4. Only III and IV
I: | independent existence |
II: | performing the essential functions of life |