I: | The major lipids in cell membrane are phospholipids that are arranged in a bilayer. |
II: | The ability of lipids and carbohydrates to move laterally within the membrane is measured by its fluidity. |
III: | In addition to phospholipids, the animal cell membrane also contains cholesterol. |
IV: | Algae have a cell wall, made of cellulose, galactans, mannans, and minerals like calcium carbonate. |
V: | In plants other than algae, cell membrane consists of cellulose, hemicellulose, pectins and proteins |
The famous aphorism ‘omnis cellula-e-cellula’ was added to the cell theory by:
1. Theodor Schwann
2. Matthias Schleiden
3. Robert Hooke
4. Rudolf Virchow
1. | motile. |
2. | enclosed by peptidoglycan cell wall. |
3. | prokaryotic. |
4. | capable of fixing atmospheric nitrogen. |
Consider the two statements:
Statement I: | Plant cells possess cell walls, plastids and a large central vacuole which are absent in animal cells. |
Statement II: | Animal cells have centrioles which are absent in almost all plant cells. |
1. | Statement I is correct; Statement II is incorrect |
2. | Statement I is correct; Statement II is correct |
3. | Statement II is incorrect; Statement I is correct |
4. | Statement I is incorrect; Statement II is incorrect |
1. | Despite great morphological difference between eucaryotic cells and prokaryotes, they are remarkably similar metabolically. |
2. | The 80S ribosomes of eukaryotes are made up of 50S and 30S subunits. |
3. | The rough part of rough endoplasmic reticulum is caused by bound ribosomes in the process of synthesizing ER proteins. |
4. | The nucleolus is where the structural RNA for the cells ribosomes is transcribed from DNA. |
1. | Sub-metacentric | 2. | Acrocentric |
3. | Metacentric | 4. | Telocentric |
I: | SER are the sites for lipid synthesis |
II: | RER has ribosomes attached to ER |
III: | In prokaryotes, only RER are present |
1. | Transportation | 2. | Nuclear division |
3. | Protein synthesis | 4. | Motility |
1. | A, D and E only | 2. | B and D only |
3. | A, C and E only | 4. | A and D only |
I: | In bacteria, the mesosomes are formed by the extensions of the plasma membrane. |
II: | The mesosomes, in bacteria, help in DNA replication and cell wall formation. |