Cell Biology Test - 14

This is the correct option as this statement about animal mitosis is false. The cell often becomes spherical prior to division. The cell does not change shape prior to division in plant mitosis.

This is the correct option. During leptotene phase, nucleus enlarges but their ends remain attached to nuclear envelope through attachment plate. At the transition to the zygotene stage the telomeres usually aggregate at a nuclear envelope sector, thereby forming a meiotic bouquet.

This is the correct option as both the statements are true.
Eumitosis is a type of mitosis in which the nuclear membrane dissolves during prometaphase so that there remains no distinction between cytoplasm and nucleoplasm. The chromosomes remain attached to the spindles through their centromeres.
In the telophase the spindle fibres disappear around the poles. Golgi complex and endoplasmic reticulum are reformed. In animal cells the astral rays are also withdrawn. Rest of the spindle fibres persist during the cell plate method of cytokinesis but disappear where cytokinesis takes place by cleavage or constriction.

This is the correct option. In Telophase I, the polar groups of chromosomes arrange themselves into haploid or dyad nuclei and elongate.
The polar groups of chromosomes arrange themselves into haploid or dyad nuclei. The chromosomes elongate. A nucleolus is formed by the satellite chromosome. It is followed by the appearance of nucleoplasm and nuclear envelope. The elongated chromosomes usually remain straight and do not enter the interphase. In some cases telophase is completely absent and the anaphase chromosomes directly enter the metaphase of homotypic division

The centromere of each chromosome divides into two so that there is one centromere for each chromatid in Anaphase II.

This is the correct option as RNA replication does not take place during the division of a cell.

Anaphase is the stage of mitosis after the metaphase when replicated chromosomes are split and the daughter chromatids are moved to opposite poles of the cell.

This is the correct option as this statement is false. The interphase lasts more than 95% of the duration of the cell cycle.

This is the correct option. In gap 1 phase, the cell is metabolically active and grows continuously, but does not replicate its DNA. In synthesis phase, DNA replication begins in the nucleus and the centriole duplicates in the cytoplasm. In gap 2 phase, cell growth continues and proteins are synthesised in preparation for mitosis.

This is the correct option as this statement is false. Plants show mitotic divisions in both haploid and diploid cells.