Which is true about external regulators. (multiple answers)
a. They direct cells to speed up or slow down the cell cycle.
b. They prevent the cell from entering anaphase until all its chromosomes are attached
to the mitotic spindle.
c. They include growth factors.
d. They prevent excessive cell growth and keep the tissues of the body from disrupting
each other.

Question

Which is true about external regulators. (multiple answers) 
a. They direct cells to speed up or slow down the cell cycle.
b. They prevent the cell from entering anaphase until all its chromosomes are attached
to the mitotic spindle.
c. They include growth factors.
d. They prevent excessive cell growth and keep the tissues of the body from disrupting
each other.

anonymous · Answer

I know that A is true let me check for others.

anonymous · Answer

Probably C and D. Or just one of the two. Hope this is helpful!

anonymous · Answer

Dank! ^^

kira_yamato · Answer

Which is true about external regulators. (multiple answers)
a. They direct cells to speed up (Growth factors e.g. PDGF) or slow down (Growth inhibitory factors e.g. TGF-beta) the cell cycle.
b. They prevent the cell from entering anaphase until all its chromosomes are attached to the mitotic spindle.
c. They include growth factors. (see a)
d. They prevent excessive cell growth and keep the tissues of the body from disrupting each other. (see a)
So everything except B is true. This occurs at the M-phase checkpoint and is carried out by intracellular proteins.