The biosynthesis of ribosomal RNA occurs in:
1. | Ribosomes | 2. | Golgi apparatus |
3. | Microbodies | 4. | Nucleolus |
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) |
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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.
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The largest structures passed through the nuclear pores are:
1. | rDNA | 2. | Lamin proteins |
3. | mRNA | 4. | Ribosome subunits |