BIOLOGY CUMULATIVE EXAM
# 3 QUESTIONS AND
CORRECT ANSWERS
A
VI
TU
IS
About 25 of the 92 natural elements are known to be essential to life. Which 4 of
these 25 elements make up approximately 96% of living matter? - ANSWER
carbon, hydrogen, nitrogen, oxygen
M
Trace elements are those required by an organism in only minute quantities.
O
Which of the following is a trace element that is required by humans and other
vertebrates, but not by other organisms such as bacteria or plants? - ANSWER
A
iodine
Which of the following statements is TRUE? - ANSWER Some naturally
N
occurring elements are toxic to organisms.
JP
Which of the following are compounds? - ANSWER H2O and CH4, but not
O2
Atoms have no electric charge because they have ________. - ANSWER an
equal number of protons and electrons
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic
number of ________. - ANSWER 6
, Molybdenum has an atomic number of 42. Several common isotopes exist, with
mass numbers from 92-100. Which of the following can be true? - ANSWER
Molybdenum atoms can have between 50 and 58 neutrons.
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen
atom by ________. - ANSWER Polar covalent bonds
A
The partial negative charge at one end of a water molecule is attracted to the
partial positive charge of another water molecule. What is this attraction called? -
VI
ANSWER a hydrogen bond
The partial negative charge in a molecule of water occurs because ________. -
TU
ANSWER the electrons shared between the oxygen and hydrogen atoms
spend more time around the oxygen atom nucleus than around the hydrogen
atom nucleus
IS
Sulfur is in the same column of the periodic table as oxygen, but has
electronegativity similar to carbon. Compared to water molecules, molecules of
H2S will ________. - ANSWER not form hydrogen bonds with each other
M
Water molecules can form hydrogen bonds with ________. - ANSWER
O
compounds that have polar covalent bonds
Cohesion, surface tension, and adhesion are the properties of water molecules
A
that ________. - ANSWER are a result of hydrogen bonding
N
Liquid water ________. - ANSWER has a heat of vaporization higher than
that of most other substances
JP
The complexity and variety of organic molecules is due to ________. - ANSWER
the chemical versatility of carbon atoms
The experimental approach taken in current biological investigations presumes
that ________. - ANSWER living organisms can be understood in terms of
the same physical and chemical laws that can be used to explain all natural
phenomena
# 3 QUESTIONS AND
CORRECT ANSWERS
A
VI
TU
IS
About 25 of the 92 natural elements are known to be essential to life. Which 4 of
these 25 elements make up approximately 96% of living matter? - ANSWER
carbon, hydrogen, nitrogen, oxygen
M
Trace elements are those required by an organism in only minute quantities.
O
Which of the following is a trace element that is required by humans and other
vertebrates, but not by other organisms such as bacteria or plants? - ANSWER
A
iodine
Which of the following statements is TRUE? - ANSWER Some naturally
N
occurring elements are toxic to organisms.
JP
Which of the following are compounds? - ANSWER H2O and CH4, but not
O2
Atoms have no electric charge because they have ________. - ANSWER an
equal number of protons and electrons
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic
number of ________. - ANSWER 6
, Molybdenum has an atomic number of 42. Several common isotopes exist, with
mass numbers from 92-100. Which of the following can be true? - ANSWER
Molybdenum atoms can have between 50 and 58 neutrons.
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen
atom by ________. - ANSWER Polar covalent bonds
A
The partial negative charge at one end of a water molecule is attracted to the
partial positive charge of another water molecule. What is this attraction called? -
VI
ANSWER a hydrogen bond
The partial negative charge in a molecule of water occurs because ________. -
TU
ANSWER the electrons shared between the oxygen and hydrogen atoms
spend more time around the oxygen atom nucleus than around the hydrogen
atom nucleus
IS
Sulfur is in the same column of the periodic table as oxygen, but has
electronegativity similar to carbon. Compared to water molecules, molecules of
H2S will ________. - ANSWER not form hydrogen bonds with each other
M
Water molecules can form hydrogen bonds with ________. - ANSWER
O
compounds that have polar covalent bonds
Cohesion, surface tension, and adhesion are the properties of water molecules
A
that ________. - ANSWER are a result of hydrogen bonding
N
Liquid water ________. - ANSWER has a heat of vaporization higher than
that of most other substances
JP
The complexity and variety of organic molecules is due to ________. - ANSWER
the chemical versatility of carbon atoms
The experimental approach taken in current biological investigations presumes
that ________. - ANSWER living organisms can be understood in terms of
the same physical and chemical laws that can be used to explain all natural
phenomena
