Which organelle changes chemical energy into a form that is usable by the cell?
a. mitochondria
b. ribosome
c. nucleus
d. cell wall

Explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?

True or false a fertilized cell divides many times to form an embryo

If scientists are trying to use what they know about hsv to devise a means of protecting other people from being infected, which of the following would have the best chance of lowering the number of new cases of infection? a) vaccinate of all persons with preexisting cases of hsvb) interfere with new viral replication in preexisting cases of hsvc) treat hsv lesions to shorten the breakoutd) educate people about avoiding sources of infection