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. |
The biosynthesis of ribosomal RNA occurs in:
1. Ribosomes
2. Golgi apparatus
3. Microbodies
4. Nucleolus
Non-membranous nucleoplasmic structures in the nucleus, are the sites for active synthesis of:
1. | protein | 2. | mRNA |
3. | rRNA | 4. | tRNA |
1. Larger nucleoli are present in dividing cells.
2. It is a membrane-bound structure.
3. It takes part in spindle formation.
4. It is a site for active ribosomal RNA synthesis.
Ribosomal RNA is actively synthesized in:
1. Lysosomes
2. Nucleolus
3. Nucleoplasm
4. Ribosomes