Statement I: | Prokaryotic cells lack a defined nucleus and instead have a nucleoid region where the DNA is concentrated. |
Statement II: | Eukaryotic cells possess a true nucleus enclosed by a nuclear membrane, which houses the cell’s genetic material. |
1. | Both Statement I and Statement II are true. |
2. | Statement I is true but Statement II is false. |
3. | Statement I is false but Statement II is true. |
4. | Both Statement I and Statement II are false. |
Match List - I with List - II
List -I | List -II | ||
(a) | Cristae | (i) | Primary constriction in chromosome |
(b) | Thylakoids | (ii) | Disc-shaped sacs in Golgi apparatus |
(c) | Centromere | (iii) | Infoldings in mitochondria |
(d) | Cisternae | (iv) | Flattened membranous sacs in stroma of plastids |
Choose the correct answer from the options given below.
(a) | (b) | (c) | (d) | |
1. | (iii) | (iv) | (i) | (ii) |
2. | (ii) | (iii) | (iv) | (i) |
3. | (iv) | (iii) | (ii) | (i) |
4. | (i) | (iv) | (iii) | (ii) |
Which of the following is an incorrect statement?
1. | The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm. |
2. | Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm. |
3. | Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. |
4. | Microbodies are present both in plant and animal cells. |
Statement I: | The nucleolus within the nucleus is primarily involved in the synthesis of rRNA and assembly of ribosomes. |
Statement II: | Ribosomes are membrane-bound organelles that are only found within the nucleus of eukaryotic cells. |