The Cell Cycle is regulated by both external and internal factors. Part A: List two external factors that influence the cell cycle and briefly describe them. (2 points) Part B: List two internal factors that influence the cell cycle and briefly describe them. (2 points)

The correct answer is -

Mitochondria produce energy from food, while chloroplasts produce food from the Sun’s energy.

Mitochondria is a specialised membrane bound organelle that is present in the eukaryotes (such as plant and animals) and it is considered as the power house of the cells. It helps in the generation of large amount of energy in the form of ATP (adenosine triphosphate) through cellular respiration (that depicts complete oxidation of food, such as glucose).

Chloroplast is a membrane bound organelle, which is present in the photosynthetic organsisms such as green plants and algae. It is the site for photosynthesis, which is a process of formation of food using sunlight in the presence of carbon dioxide and water.

Thus, second option is the right answer.