1. Atoms bonded together to form a chemical unit are called
A. molecules.
B. ions.
C. radioisotopes.
D. buffers.
2. When one atom has a stronger attraction for shared electrons in a bond than the other atom, a(an)
___________ covalent bond is formed.
A. polar
B. nonpolar
C. ionic
D. metallic
3. The lower the pH,
A. the greater the hydrogen ion concentration.
B. the more acidic the solution.
C. both the greater the hydrogen ion concentration and the more acidic the solution are correct.
D. the greater the hydroxide ion concentration.
E. the more basic the solution and the greater the hydroxide ion concentration.
4. Organic compounds always contain ___________ atoms.
A. water
B. carbon
C. nitrogen
D. oxygen
, 5. Which of the following is NOT a monosaccharide?
A. Glucose
B. Fructose
C. Sucrose
D. Galactose
6. Glycogen is
A. a monosaccharide used for quick energy.
B. a protein found in cell membranes.
C. a polysaccharide used as stored energy in animals.
D. a fat found in margarine.
7. How many different amino acids compose all human polypeptides (proteins)?
A. 10
B. 15
C. 20
D. 25
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