Control of the cell cycle, Biology

Assignment Help:

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. 


Related Discussions:- Control of the cell cycle

Explain dental care delivery system, Explain Dental Care Delivery System ...

Explain Dental Care Delivery System In the dental care delivery system: there are: patients, insurance payers and dentists For patients: Success = function + esthetics

Leptospirosis, Leptospirosis Synonyms: Weil’ disease, canicola fever...

Leptospirosis Synonyms: Weil’ disease, canicola fever, 7-day fever Leptospirosis is an important and widespread zoonosis. It was first described by Adolf Weil in 1886 when h

How could an adult lose billions of cells, How can an adult lose billions o...

How can an adult lose billions of cells from all parts of the body each day and still survive?

Explain the cardiovascular type of infantile beriberi, Explain The cardiova...

Explain The cardiovascular type of infantile beriberi? It manifests itself in babies between the ages of 2 and 4 months. The onset is acute with classical signs and symptoms of

Class of coclentrata, ????? # 100 ??????????? #Minimum ?????? ?????

????? # 100 ??????????? #Minimum ?????? ?????

Anticoagulation, In patients with left ventricular failure and reduced ejec...

In patients with left ventricular failure and reduced ejection fractions, the risk of LV thrombus formation and systemic arterial embolization appears to be primarily in patients

What are similarities between proteins, What are some similarities between ...

What are some similarities between proteins, carbohydrates, and nucleic acids?

What are cytokines, What are Cytokines? Cytokines are polypeptides, whi...

What are Cytokines? Cytokines are polypeptides, which influence the proliferation, differentiation, metabolism and activation of cells. There are three areas in cancer that hav

Explain change in body composition of infants, Explain Change in body Compo...

Explain Change in body Composition of infants? The weight gain comprise of growth in the muscle, organ tissue, adipose and skeletal structure. One compartment of body which reg

Explain the maintenance requirement of nutritional needs, Explain the Maint...

Explain the Maintenance Requirement of nutritional needs? This is defined as 'the amount of nutrient that is needed to replace the wear and tear of the tissues within the body

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd