Question

which tissues the mitotic cycle of a cell coincides with the entire period of its existence, i.e. with the life cycle of a cell?​

Answer 1

Answer:

involves both the elongation of overlapping microtubules and the use of two distinct sets of motor proteins: one pulls overlapping microtubules past each other, and the other pulls astral microtubules that have attached to the cell cortex. The contributions of early anaphase and late anaphase to anaphase as a whole vary by cell type. In mammalian cells, late anaphase follows shortly after early anaphase and extends the spindle to approximately twice its metaphase length; by contrast, yeast and certain protozoans use late metaphase as the main means of chromosome separation and, in the process, can extend their spindles to up to 15 times the metaphase length.[7]

Cyclins

Cyclins are a Group of proteins that control the progression of cells through the cell cycle by activating Cyclin-dependent kinase (Cdk) enzymes. Cyclins were discovered by R. Timothy Hunt in 1982 while studying the cell cycle of sea urchins.

Types of Cyclins

There are several different cyclins that are active in different parts of the cell cycle and that cause the Cdk to phosphorylate different substrates.

There are two groups of cyclins:

G1/S cyclins – These cyclins are essential for the control of the cell cycle at the G1/S transition, Cyclin A / CDK2 – active in S phase. Cyclin D / CDK4, Cyclin D / CDK6, and Cyclin E / CDK2 – regulates transition from G1 to S phase.

G2/M cyclins – essential for the control of the cell cycle at the G2/M transition (mitosis). G2/M cyclins accumulate steadily during G2 and are abruptly destroyed as cells exit from mitosis (at the end of the M-phase). Cyclin B / CDK1 – regulates progression from G2 to M phase.

There are also several “orphan” cyclins for which no Cdk partner has been identified. For example, cyclin F is an orphan cyclin that is essential for G2/M transition.[8]

Cyclin dependent kinases (CDKs)

CDKs are a family of protein kinases. CDKs are present in all known eukaryotes, and their regulatory function in the cell cycle has been evolutionarily conserved. CDKS are also involved in regulation of transcription, mRNA processing, and the differentiation of nerve cells. One interesting fact