Read the following statements:
(i) Duration of cell cycle in a human somatic cell is 24 hours & that of yeast cell is 90 minutes
(ii) Interphase represents the phase between two successive M-phases.
(iii) In a human somatic cell the cell division proper lasts for only about an hour
(iv) During daughter cell formation, cytokinesis is followed by karyokinesis in parent cell
(v) S-phase is followed by G2 phase
How many of the above statements are correct?
Answers
Answer:
Explanation:[1] YES,true,The duration of cell cycle can vary from organism to organism and also from cell type to cell type. normal human cells in culture, divide once in approximately every 24 hours but yeast can progress through the cell cycle in only about 90 minutes.
[2] YES,true,The phase between two successive M-phases is called interphase. The M-phase represents the phase when the actual cell division or mitosis occurs and the interphase represents the phase between two successive M phases. ... The interphase lasts more than 95% of the duration of cell cycle.
[3] YES,true,The M Phase represents the phase when the actual cell division or mitosis occurs and the interphase represents the phase between two successive M phases. It is significant to note that in the 24 hour average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.
[4] NO,false,This separation of the genetic material in a mitotic nuclear division (or karyokinesis) is followed by a separation of the cell cytoplasm in a cellular division (or cytokinesis) to produce two daughter cells. In some single-celled organisms mitosis forms the basis of asexual reproduction.
[5] YES,true,Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells.
above 4 statements are correct and one is wrong