Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle ?

In which phase of meiosis homologous chromosomes separates ?

During gamete formation, the enzyme recombinase participates during

Solution

Recombinase enzyme catalyzes the exchange of short pieces of DNA between two long DNA strands particularly the exchange of homologous regions between the paired maternal and paternal chromosome in prophase - I.

At metaphase, chromosomes are attached to the spindle fibres by their

Solution

Kinetochores are large protein complexes that bind the centromeres of chromosomes to the microtubules of mitotic spindle fibres during meta phase in the cell cycle.

Select the correct option with respect to mitosis.

Chromatids separate but remain in the centre of the cell in anaphase.
Chromatids start moving towards opposite poles in telophase.
Golgi complex and endoplasmic reticulum are still visible at the end of prophase.
Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

Solution

In mitosis chromosomes move to the equator and get aligned along equatorial plate in metaphase.

Which of the following is true of kinetochores?

Solution

Kinetochores are assembled at the centromere of each chromosome and are the sites where microtubules attach to segregate the chromosomes. In meiosis there is only one fused kinetochore per chromosome; in mitosis there are two kinetochores per chromosome.

During mitosis ERand nucleolus begin to disappear at:

Solution

During mitosis, endoplasmic reticulum and nucleus begins to disappear at early prophase. Also, nucleus and cell become spherical and DNA molecules condense to form shortened chromosome.

Synapsis occurs between:

Solution

Synapsis (also called syndesis)is the pairing of two homologous chromosomes that occurs during prophase I(zygotene stage) of meiosis. The two chromosomes move together and pairing of corresponding points along their lengths as they lie side to side. The resulting structure is called a bivalent.

Given below is a schematic break-up of the phases / stages of cell cycle:

Which one of the following is the correct indication of the stage/phase in the cell cycle?

Solution

In schematic break-up of the phases/ stages of cell cycle,D synthetic phase is the correct indication of the stage/phase in the cell cycle.

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

Solution

Histone proteins are synthesized during S-phase of cell cycle or Synthetic phase.

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