1. Negatively charged particles in an atom are called
neutrons.
electrons.
protons.
elements.

2. Substances that can not be broken down into simpler substances by ordinary chemical reactions are called
atoms.
compounds. 
elements.
molecules.

3. A particle with a negative or positive charge is referred to as 
electron.
proton.
ion.
isotope.

4. A chemical bond where electrons are transferred from one atom to another is a(n)
hydrogen bond
ionic bond.
covalent bond.
none of the above

5. The bond which is found between water molecules is a(n)
hydrogen bond.
ionic bond.
covalent bond.
none of the above

6. A chemical bond in which one pair of electrons is shared between atoms is a(n) 
hydrogen bond.
ionic bond.
covalent bond.
none of the above

7. All of the following are organic compounds EXCEPT
nucleic acids.
water.
proteins. 
carbohydrates.

8. Energy needed for chemical reactions in the body is provided by the breakdown of 
ribonucleic acid (RNA).
deoxyribonucleic acid (DNA).
adenosine triphosphate (ATP).
adenosine diphosphate (ADP).

9. Which of the following describes the most acidic solution?
pH 4
pH 5
pH 7
pH 14

10. The building blocks of proteins are
fatty acids.
nucleic acids.
amino acids.
monosaccarides.