Which one of the following precedes re-formation of the nuclear envelope during M-phase of the cell Cycle?
Decondensation from chromosome and reassembly of the nuclear lamina
Transcription from chromosome and reassembly of the nuclear lamina
Formation of the contractile ring and formation of the phragmoplast
Formaltion of the contractile ring and transcription from chromosomes
A.
Decondensation from chromosome and reassembly of the nuclear lamina
At telophase stage, nuclear membrane vesicles associate with the surface of individual chromosomes and fuse to reform the nuclear membranes, which partially enclose clusters of chromosomes before coalescing to reform the complete nuclear envelope. During this process, the nuclear pores reassemble and the dephosphorylated reassociate to form the nuclear lamina) One of the lamina proteins (lamina-B) remains with the nuclear membrane fragments throughout mitosis and may help nucleate assembly. After the nucleus reforms, the pores pump in nuclear proteins, the chromosome decondense and RNA synthesis resume, causing the nucleolus to reappear.
Select the wrong statement :
Cell wall is present in members of Fungi and Plantae
Mushrooms belong to Basidiomycetes
Mitochondria are the powerhouse of the cell in all kingdoms except Monera
Pseudopodia are locomotory and feeding structures in Sporozoans
Post-mitotic gap phase is characterised by all, except
Synthesis of RNA and nucleotides
No change in DNA content
Synthesis of histone proteins
Growth phase of the hell
Independent assortment of gene occurs due to the orientation of chromosomes at
Metaphase-I of mitosis
Metaphase-I of meiosis
Metaphase-II of meiosis
Any phase of the cell division
The non-disjunction, in meiosis may result is extra copy of a chromosome in a sperm cell. During which phase the above phenomenon may occur?
Prophase-I, prophase-II
Prophase-I, prophase-II
Anaphase-I, anaphase-II
Anaphase-I, telophase-II
The mitotic cell cycle is divided typically into four phases; G1, S, G2 and M. Considering a mitotic cycle time of 18 hrs; the distribution of period of time (in hrs) for each of these phases will be
| G1 | S | G2 | M |
| 1 | 3 | 5 | 9 |
| G1 | S | G2 | M |
| 9 | 1 | 3 | 5 |
| G1 | S | G2 | M |
| 9 | 5 | 3 | 1 |
| G1 | S | G2 | M |
| 3 | 5 | 9 | 1 |
Viruses that infect bacterial multiplication and cause their lysis, are called
Lysozymes
Lipolytic
Lytic
Lysogenic
During meiotic division, the
homologous chromosomes are seperated
linkage is disturbed
homologous chromosomes do not segregate
All of the above
During the G1- phase of cell division
RNA and proteins are synthesised
DNA and proteins are synthesised
cell prepares for M- phase
cell undergoes duplication
In cell cycle, during which phase chromosomes are arranged in equatorial plate?
Metaphase
Anaphase
Telophase
Prophase
