Mitotic spindle have main protein

• tubulin

• myosin

• tropomyosin

• dynein

Crossing over occurs in

• zygotene

• leptotene

• pachytene

• diplotene

Number of chromosomes in an angiospermic plant is 14, then the number of chromosomes in synergid cells will be

• 14

• 7

• 28

• 21

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

• During entire prophase

• During telophase

• During S-phase

• During G₂ stage of prophase

In meiosis division is

• Ist reductional and IInd equational

• Ist equational and IInd reductional

• both reductional

• both equational

Colchicine prevents the mitosis of the cells at which of the following stage?

• Anaphase

• Metaphase

• Prophase

• Interphase

47.

Which typical stage is known for DNA replication?

• Metaphase

• G₁- phase

• S- phase

• G₂- phase

The term 'Meiosis' was given by

• Johansen

• Knoll and Ruska

• A. Flemming

• Farmer and Moore

Lampbrush chromosomes are seen in which typical stage

• mitotic anaphase

• mitotic prophase

• mitotic metaphase

• meiotic prophase

The checkpoint in cell cycle plays important role in

• repairing DNA damage

• apoptosis initiation

• assessing DNA damage

• none of these