Destruction of both centrosomes with a laser beam in an animal cell:

1. will prevent both mitosis and cytokinesis

2. prevents cytokinesis even if mitosis has been completed normally

3. permits cytokinesis but the daughter cells fail to enter a new S phase

4. prevents mitosis but permits cytokinesis

Which of the following statements is not true for cancer cells in relation to mutations?
1. Mutations in proto-oncogenes accelerate the cell cycle.
2. Mutations destroy telomerase inhibitor.
3. Mutations inactivate the cell control.
4. Mutations inhibit production of telomerase.

Telomerase is an enzyme which is a:
1. Ribonucleoprotein
2. Simple protein
3. RNA
4. Repetitive DNA

Which stage of meiosis is shown in the diagram given below?

In meiosis:

The mechanisms that contribute to the genetic variation arising from sexual reproduction include:

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

A prolonged resting phase in oogenesis as seen in many vertebrate oocytes is called as:
1. Interkinesis
2. Diakinesis
3. Diplotene
4. Prometaphase II

Place stages of Prophase I in correct order.
1. diakinesis, diplotene, leptotene, pachytene, zygotene.
2. diplotene, leptotene, pachytene, zygotene, diakinesis.
3. leptotene, pachytene, diakinesis, diplotene, zygotene.
4. leptotene, zygotene, pachytene, diplotene, diakinesis

DNA replication takes place during :