The chromosomes in which centromere is situated close to one end are
1. | metacentric | 2. | acrocentric |
3. | telocentric | 4. | sub-metacentric |
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) |
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 largest structures passed through the nuclear pores are:
1. | rDNA | 2. | Lamin proteins |
3. | mRNA | 4. | Ribosome subunits |