A common characteristic feature of plant sieve tube cells and most mammalian erythrocytes is
| 1. | absence of mitochondria |
| 2. | presence of cell wall |
| 3. | presence of haemoglobin |
| 4. | absence of nucleus |
Which of the following features is common to prokaryotes and many eukaryotes?
| 1. | Chromatin material present |
| 2. | Cell wall present |
| 3. | Nuclear membrane present |
| 4. | Membrane bound sub-cellular organelles present |