Cell Cycle and Cell Division

Centromere is required for -

1. Crossing over
2. Movement of chromosomes towards poles
3. Transcription
4. Cytoplasmic cleavage

In the somatic cell cycle

1. in G1 phase DNA content is double the amount of DNA present in the original cell
2. DNA replication takes place in S phase
3. a short interphase is followed by a long mitotic phase
4. G2 phase follows mitotic phase

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

1. Metaphase
2. Telophase
3. Anaphase
4. Prophase

Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle?

1. Decondensation from chromosomes, and reassembly of the nuclear lamina
2. Transcription from chromosomes, and reassembly of the nuclear lamina
3. Formation of the contractile ring, and formation of the phragmoplast
4. Formation of the contractile ring, and transcription from chromosomes

Mitotic spindle is mainly composed of which protein?

1. Actin
2. Myosin
3. Tubulin
4. Myoglobin

In which stage of cell cycle, DNA replication occurs?

1. G1-phase
2. S-phase
3. G2-phase
4. M-phase