Which of the following occurs when a covalent bond forms?
a) The potential energy of electrons drops.
b) Electrons in valence shells are shared between nuclei.
c) Ions of opposite charge interact.
d) Polar molecules interact.

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.

Describe the function of the endomembrane system? what organelles are involved?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.