Which statement BEST describes the relationship between MPF and the cell cycle? A. Cyclin binds with an enzyme to produce MPF Cyclin, and as its concentration rises, it promotes mitosis. B. Cyclin binds with a factor to produce MPF enzyme, and as the enzyme's concentration decreases, it promotes mitosis. C. The MPF Cyclin concentration remains constant, as the rise and fall of the MPF enzyme controls the cell cycle. D. The MPF Cyclin concentration increases and decreases in a cycle, but does not control the cell cycle.

Option A

Explanation:

Cyclin binds with an enzyme to produce MPF Cyclin, and as its concentration rises, it promotes mitosis.

Therefore, cyclin binds with a factor to produce MPF enzyme, and as the enzyme's concentration decreases, it promotes mitosis; the MPF Cyclin concentration remains constant, as the rise and fall of the MPF enzyme controls the cell cycle; the MPF Cyclin concentration increases and decreases in a cycle, but does not control the cell cycle are not best described the relationship between MPF and cell cycle.

the areas around the equator

well, i believe that the answer is 2. : 3