BIOL 1020 EXAM 1 RIGGS COMPREHENSIVE
QUESTIONS WITH VERIFIED PRACTICE
SOLUTIONS
●● 2. Cellulose is a ___________.
A) polysaccharide stored in plant cells.
B) polysaccharide made of α-glucose.
C) a polysaccharide made of modified β-glucose units.
D) starch made of α-glucose.
E) starch made of amylopectins.
Answer: C) a polysaccharide made of modified β-glucose units.
●● 4. Why are water molecules cohesive?
A) because they create surface tension B) because they form hydrogen
bonds
D) because they stick to other polar molecules
E) because they are repelled by nonpolar molecules
Answer: B) because they form hydrogen bonds
,●● 5. A single covalent chemical bond represents the sharing of how
many electrons?
A)1
B)2
C)3
D)4
E)6
Answer: B) 2
●● 6. The formation of sodium chloride
(NaCl) is the result of
A) covalent bonding.
B) chemical unreactivity.
C) attraction between ions.
D) the lack of chemical attraction.
Answer: C) attraction between ions.
●● 7. Sodium (Na), atomic number 11, has a tendency to lose an
electron in the presence of chlorine. After losing the electron, Na will
have ________ protons in its nucleus.
,A) 10
B) 11
C) 12
D) 21
E) 22
Answer: B) 11
●● 8. How many electron pairs are shared between carbon atoms in a
molecule that has the formula C2H4?
A) 2
B) 1
C) 4
D) 3
Answer: A) 2
●● 9. Which of the following statements is true about buffer solutions?
A) They maintain a relatively constant pH when either acids or bases are
added to them.
B) They maintain a constant pH when bases are added to them but not
when acids are added to them. C) They fluctuate in pH when either acids
or bases are added to them.
, D) They maintain a constant pH when acids are added to them but not
when bases are added to them.
Answer: A) They maintain a relatively constant pH when either acids or
bases are added to them.
●● 10. What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds involve the sharing of electrons between atoms; ionic
bonds involve the sharing of protons between charged atoms.
B) Covalent bonds involve the sharing of pairs of electrons between
atoms; ionic bonds involve the sharing of single electrons between
atoms.
C) Covalent bonds involve the sharing of electrons between atoms; ionic
bonds involve the electrical attraction between charged atoms.
D) Covalent bonds involve the transfer of electrons between charged
atoms; ionic bonds involve the sharing of electrons between atoms.
Answer: C) Covalent bonds involve the sharing of electrons between
atoms; ionic bonds involve the electrical attraction between charged
atoms.
●● 13. An atom's nucleus is composed of
A) protons.
B) neutrons.
QUESTIONS WITH VERIFIED PRACTICE
SOLUTIONS
●● 2. Cellulose is a ___________.
A) polysaccharide stored in plant cells.
B) polysaccharide made of α-glucose.
C) a polysaccharide made of modified β-glucose units.
D) starch made of α-glucose.
E) starch made of amylopectins.
Answer: C) a polysaccharide made of modified β-glucose units.
●● 4. Why are water molecules cohesive?
A) because they create surface tension B) because they form hydrogen
bonds
D) because they stick to other polar molecules
E) because they are repelled by nonpolar molecules
Answer: B) because they form hydrogen bonds
,●● 5. A single covalent chemical bond represents the sharing of how
many electrons?
A)1
B)2
C)3
D)4
E)6
Answer: B) 2
●● 6. The formation of sodium chloride
(NaCl) is the result of
A) covalent bonding.
B) chemical unreactivity.
C) attraction between ions.
D) the lack of chemical attraction.
Answer: C) attraction between ions.
●● 7. Sodium (Na), atomic number 11, has a tendency to lose an
electron in the presence of chlorine. After losing the electron, Na will
have ________ protons in its nucleus.
,A) 10
B) 11
C) 12
D) 21
E) 22
Answer: B) 11
●● 8. How many electron pairs are shared between carbon atoms in a
molecule that has the formula C2H4?
A) 2
B) 1
C) 4
D) 3
Answer: A) 2
●● 9. Which of the following statements is true about buffer solutions?
A) They maintain a relatively constant pH when either acids or bases are
added to them.
B) They maintain a constant pH when bases are added to them but not
when acids are added to them. C) They fluctuate in pH when either acids
or bases are added to them.
, D) They maintain a constant pH when acids are added to them but not
when bases are added to them.
Answer: A) They maintain a relatively constant pH when either acids or
bases are added to them.
●● 10. What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds involve the sharing of electrons between atoms; ionic
bonds involve the sharing of protons between charged atoms.
B) Covalent bonds involve the sharing of pairs of electrons between
atoms; ionic bonds involve the sharing of single electrons between
atoms.
C) Covalent bonds involve the sharing of electrons between atoms; ionic
bonds involve the electrical attraction between charged atoms.
D) Covalent bonds involve the transfer of electrons between charged
atoms; ionic bonds involve the sharing of electrons between atoms.
Answer: C) Covalent bonds involve the sharing of electrons between
atoms; ionic bonds involve the electrical attraction between charged
atoms.
●● 13. An atom's nucleus is composed of
A) protons.
B) neutrons.
