1. Parts of the atom that carry single negative electrical charges are called:
A. electrons
B. neutrons
C. protons
D. plustrons
2. The building blocks of proteins are
A. nucleic acids
B. ATP
C. monosaccharides
D. amino acids
E. triglycerides
3. Which of the following is part of a nucleotide?
A. glycerol
B. sugar
C. fatty acids
D. all of the above
4. In ionic bonds, opposite ions are attracted to each other.
A. true
B. false
5. Which solution is the most acidic?
A. carrot juice pH 5.2
B. blood pH 7.2
C. water pH 7.0
D. milk of magnesia pH10.5
6. Which of the following is an organic compound?
A. water
B. carbon dioxide
C. a nucleotide
D. sodium chloride
7. Which of the following lists the components of a phospholipid?
A. glycerol molecule, two chains of fatty acids, and a phosphate group
B. glycerol molecule and three chains of fatty acids
C. glycerol molecule, three chains of fatty acids, and a phosphate group
D. a phosphate group, a sugar and an organic base
8. What is an ion?
A. an atom that has lost a neutron
B. an atom that has gained a proton
C. an atom that has lost or gained an electron
D. an atom that is bonded to another atom
9. What elements are present in all proteins?
A. carbon, hydrogen, oxygen, and nitrogen
B. carbon, hydrogen, and oxygen only
C. carbon and hydrogen only
D. carbon only
10. If an atom has an atomic weight of 20 and an atomic number of 10, is it stable?
A. yes
B. no
11. If an atom has an atomic weight of 20 and an atomic number of 10, how many protons does it have?
A. 10
B. 20
C. 30
D. 15
12. HOx is a substance that releases hydrogen ions when you put it in water, therefore it is
A. a base
B. an acid
C. a salt
D. organic
13. When thousands of monosaccharides bond together to make a polysaccharide, this type of reaction is
A. a decomposition reaction
B. a synthesis reaction
C. an exchange reaction
D. a reversible reaction
14. Enzymes slow down chemical reactions.
A. true
B. false
15. Bases are substances that accept hydrogen ions.
A. true
B. false
Answers:
1. a 2. d 3. b 4. a 5. a 6. c 7. a 8. c 9. a 10. a 11. a 12. b 13.b 14. b 15. a