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The cell cycle is controlled by a cyclically operating set of reaction sequences that both trigger and coordinate key events in the cell cycle
• The cell-cycle control system is driven by a built-in clock that can be adjusted by external stimuli (chemical message).
• Checkpoint - a critical control point in the cell cycle where stop and go-ahead signals can regulate the cell cycle o Animal cells have built-in stop signals that halt the cell cycles and checkpoints until overridden by go-ahead signals. o Three Major checkpoints are found in the G1, G2, and M phases of the cell cycle.
• The G1 checkpoint - the Restriction Point o The G1 checkpoint ensures that the cell is large enough to divide, and that enough nutrients are available to support the resulting daughter cells. o If a cell receives a go-ahead signal at the G1 checkpoint, it will usually continue with the cell cycle o If the cell does not receive the go-ahead signal, it will exit the cell cycle and switch to a non-dividing state called G0 o Actually, most cells in the human body are in the G0 phase.
• The G2 checkpoint ensures that DNA replication in S phase has been completed successfully. • The metaphase checkpoint ensures that all of the chromosomes are attached to the mitotic spindle by a kinetochore.
Properties and Functions of Synapses There is an interval between depolarisation of the presynaptic terminal and the earliest appearance of a postsynaptic response. This inter
M a s t iti s Mastitis is one the important diseases in cows that has serious economic impact on livestock production. The inflammation of mammary gland is associated with
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Q What is metabolism? Metabolism is the set of chemical and physical processes upon which the life of the cells of a living being depends.
Q. What is Gastritis? Gastritis is an inflammatory lesion of the gastric mucosa, (the inner lining of the stomach). The problem is seen in two forms: a) Acute gastritis
Biodiversity provides us with life -sustaining services. As discussed below, these ecosystem services have a much higher value than most people realize. At the ecosystem level, bio
what are pathogenic characteristics of protoctista?
To test the gas given off when seeds germinate Place some mustard seeds in a flask with some damp cotton wool, in the apparatus shown in the diagram, and permit them to germina
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