Progression through the cell cycle in the yeast Saccharomyces cerevisiae is regulated by
A) external signals such as availability of nutrients and mating factors.
B) internal signals such as growth factors and steroid hormones.
C) internal signals such as the availability of glucose and ATP.
D) simple organisms such as yeast do not have a cell cycle.

Question

Quizplus · Accepted Answer

The cell cycle in yeast is regulated by external signals such as availability of nutrients and mating factors. For example, cells will only progress through the G1 phase if there are sufficient nutrients available. Mating factors can also trigger progression through the cell cycle to allow for sexual reproduction.

Progression Through the Cell Cycle in the Yeast Saccharomyces Cerevisiae