The phase of the cell cycle during which DNA replication takes place is:

 

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

The correct chronology of stages of karyokinesis in mitosis is:

1. Prophase – Anaphase – Metaphase – Telophase

2. Prophase – Metaphase – Anaphase – Telophase

3. Prophase – Metaphase – Telophase – Anaphase

4. Telophase – Anaphase – Metaphase – Prophase

The centrosome duplicates during:

The two asters together with spindle fibers form the:
1. Centrosome
2. Mitotic apparatus
3. Kinetochore
4. Chiasmata

Prophase of mitosis is not characterized by:

1. condensation of chromatin

2. migration of centrosomes to opposite poles

3. formation of mitotic apparatus

4. pairing of homologous chromosomes

Onion root tip has 16 chromosomes in each cell. How many chromosomes will the cell respectively have at G₁ phase, after S phase and after M phase?

Cells at the end of prophase, when viewed under the microscope, show:

The cell expected to go through the events of cell cycle in the least amount of time would be:

Identify the stage of mitosis shown in the given diagram:

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

The start of the second phase of mitosis, metaphase, is marked by:

1. complete disintegration of the nuclear envelope

2. alignment of chromosomes at the equatorial plate

3. de-condensation of chromatin

4. reappearance of the nucleolus