8. Which of the following are functions of external regulators of the cell cycle? Select two answers.
a. regulate checkpoints
b. make sure chromosomes have replicated
c. speed up or slow down the cell cycle
d. stop the cell cycle

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.

What factors contribute to the effect an environmental toxin has on the human body?

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin