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QU 1: Explaining The 5 Stages Of Mitosis:
Interphase: This is the normal state of a cell. It could also be known as the resting state. It's just going about its daily business of surviving and making sure it has all of the nutrients and energy it needs. It is also getting ready for another division that will happen one day. It is duplicating its nucleic acids, so when it's time for prophase again, all the pieces are there.
Prophase: A cell gets the idea that it is time to divide. First, it has to get everything ready. You need to duplicate DNA, get certain pieces in the right position (centrioles), and generally prepare the cell for the process of mitotic division.
Metaphase: The DNA lines up along a central axis and the centrioles send out specialised tubules that connect to the DNA. The DNA (chromatin) has now condensed into chromosomes. Two strands of a chromosome are connected at the centre with a centromere. The tubules actually connect to the centromere, not the DNA.
Anaphase: The separation begins. Half of the chromosomes are pulled to one side of the cell; half go the other way. When the chromosomes get to the side of the cell, it's time to move on to telophase.
Telophase: Now the division is finishing up. This is the time when the cell membrane closes in and splits the cell into two pieces. You have two separate cells each with half of the original DNA.
QU 2: The Cell Cycle Of Mitosis:
Interphase describes the period between cell divisions. During this phase (the longest phase of the cell cycle) the cell grows, DNA is replicated and the centrioles divide. Interphase is divided into the following three subphases:
G1 phase or “first gap” is a growth phase for the cell.
S phase or “synthesis” is when the cell copies its chromosomes.
G2 phase or “second gap” is a second growth phase where further growth and preparations for division occur.
This is the cycle for the cell to process. The 2 diagrams below states the cycle very clearly.
References:
http://www.biology4kids.com/files/cell2_mitosis.html
www.bristol.k12.ct.us
micro.magnet.fsu.edu
http://www.hartnell.edu/tutorials/biology/mitosis.html
Interphase: This is the normal state of a cell. It could also be known as the resting state. It's just going about its daily business of surviving and making sure it has all of the nutrients and energy it needs. It is also getting ready for another division that will happen one day. It is duplicating its nucleic acids, so when it's time for prophase again, all the pieces are there.
Prophase: A cell gets the idea that it is time to divide. First, it has to get everything ready. You need to duplicate DNA, get certain pieces in the right position (centrioles), and generally prepare the cell for the process of mitotic division.
Metaphase: The DNA lines up along a central axis and the centrioles send out specialised tubules that connect to the DNA. The DNA (chromatin) has now condensed into chromosomes. Two strands of a chromosome are connected at the centre with a centromere. The tubules actually connect to the centromere, not the DNA.
Anaphase: The separation begins. Half of the chromosomes are pulled to one side of the cell; half go the other way. When the chromosomes get to the side of the cell, it's time to move on to telophase.
Telophase: Now the division is finishing up. This is the time when the cell membrane closes in and splits the cell into two pieces. You have two separate cells each with half of the original DNA.
QU 2: The Cell Cycle Of Mitosis:
Interphase describes the period between cell divisions. During this phase (the longest phase of the cell cycle) the cell grows, DNA is replicated and the centrioles divide. Interphase is divided into the following three subphases:
G1 phase or “first gap” is a growth phase for the cell.
S phase or “synthesis” is when the cell copies its chromosomes.
G2 phase or “second gap” is a second growth phase where further growth and preparations for division occur.
This is the cycle for the cell to process. The 2 diagrams below states the cycle very clearly.
References:
http://www.biology4kids.com/files/cell2_mitosis.html
www.bristol.k12.ct.us
micro.magnet.fsu.edu
http://www.hartnell.edu/tutorials/biology/mitosis.html