BIOLOGY 1020 EXAM 1 | 114 ACTUAL
QUESTIONS AND CORRECT DETAILED
ANSWERS | ALREADY SCORED A+ | NEW
UPDATE 2025
1. How does a scientific theory differ from a scientific hypothesis?
A) Confirmed theories become scientific facts; hypotheses become theories.
B) Theories are proposed to test scientific hypotheses.
C) Hypothesis is a verifiable observation sensed directly, or sensed indirectly with
the aid of scientific instrumentation
D) Theories are usually an explanation for a more general phenomenon;
hypotheses typically address more specific issues.
E) Hypothesis is a fact based on quantitative data that is falsifiable - ANSWER
D) Theories are usually an explanation for a more general phenomenon;
hypotheses typically address more specific issues.
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.
C) protons and electrons.
D) protons and neutrons.
E) neutrons and electrons. - ANSWER D) protons and neutrons.
14. A strong acid like HCl _____.
QUESTIONS AND CORRECT DETAILED
ANSWERS | ALREADY SCORED A+ | NEW
UPDATE 2025
1. How does a scientific theory differ from a scientific hypothesis?
A) Confirmed theories become scientific facts; hypotheses become theories.
B) Theories are proposed to test scientific hypotheses.
C) Hypothesis is a verifiable observation sensed directly, or sensed indirectly with
the aid of scientific instrumentation
D) Theories are usually an explanation for a more general phenomenon;
hypotheses typically address more specific issues.
E) Hypothesis is a fact based on quantitative data that is falsifiable - ANSWER
D) Theories are usually an explanation for a more general phenomenon;
hypotheses typically address more specific issues.
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.
C) protons and electrons.
D) protons and neutrons.
E) neutrons and electrons. - ANSWER D) protons and neutrons.
14. A strong acid like HCl _____.
