When is S-phase complete?

Explanation:

The S phase only begins when the cell has passed the G 1 { G }_{ 1 } G1 checkpoint and has grown enough to contain double the DNA. S phase is halted by a protein called p16 until this happens.

The S Phase of Interphase

Explanation:

The S phase only begins when the cell has passed the G 1 {G}_{1} checkpoint and has grown enough to contain double the DNA. S phase is halted by a protein called p 16 until this happens.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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