Q: The spectrum is made up of discrete lines representing transitions of the hydrogen electron between specific energy levels within what? Choices: - a rainbow - an element - the molecule - the atom A:
the atom

Q: How many valence electrons does carbon have? Choices: - one - five - two - four A:
four

Q: What are the organic compounds that the body needs in small amounts to function properly; humans need 13 different ones? Choices: - minerals - proteins - nutrients - vitamins A:
vitamins

Q: What causes blood vessels to grow toward the tumour in cancer cells? Choices: - harnessing molecules - addressing molecules - communicating molecules - signaling molecules A:
signaling molecules