Consists of three sub-phases

G₁ usually lasts 12 hours, but in some cells (nerve or

muscle cells) G₁ can last much longer such that the cell

appears to have been halted in the cycle. These cells

are said to be in the ... phase.

During this phase, chromosomal replication

occurs and

mitochondria and centrioles divide

Period of time after the G₂ phase of interphase

Levels of these proteins

remain steady throughout the cell cycle.

These proteins are inactive at

baseline.

******** are in a constant cycle of synthesis and degradation with resulting peaks and lows of levels.

The concentration of a particular ******** is related to the cell cycle phase.

************** forms a maturation-promoting factor (MPF).

********** halting the cell

cycle.

*********** are often activated in response to environmental

signals or by molecular signals associated with damaged DNA.

Select the correct sequence of phases of mitosis:

Select a set of periods which all are called the interphase:

In which phase of cell cycle is possible to study karyotype?

Phase of Mitosis

In what phase of the mitotic cycle, chromosomes are located in the center of the cell and their centromeres attached with the spindle thread?

Phase of Mitosis

Determine the amount of DNA in the G₂-period of the cell cycle:

Determine the amount of DNA in the G₁-period of the cell cycle:

Nuclear envelope disappears

Chromosomes condense – can see sister chromatids

and centromere

Spindle forms

The phase of the eukaryotic cell cycle between the end of cytokinesis and the start of DNA synthesis.

Mechanism ensuring that cells do not enter anaphase until all chromosomes are correctly bi-oriented on the mitotic spindle.