5. Circle the letter of each sentence that is true about external regulators. 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
one another.

Match each description with the correct form of energy. 1. energy of an object's position above the ground. 2. stored in the bonds of atoms and molecules 3. stored in the nucleus of an atom 4. energy of vibrating molecules 5. movement of objects used to do work 6. created by vibrations in electric and magnetic fields chemical energy mechanical energy heat gravitational energy light nuclear energy