Bio 100 Exam 1 - mastering biology
questions Complete answers 2026
Elements - Correct answer-__________ are substances that CANNOT be broken
down into other substances by chemical reactions
Which four elements make up the bulk of living cells? - Correct answer-oxygen,
carbon, hydrogen, and nitrogen
Atomic number - Correct answer-...is the number of protons in the nucleus of an
atom, which determines the chemical properties of an element and its place in the
periodic table.
Atomic Weight - Correct answer-The number of protons plus neutrons in an atom,
represented as an average of all naturally occurring forms of the element, is known
as...
Trace elements - Correct answer-... also called micronutrients, are any chemical
element required by living organisms in minuscule amounts, but cells require them
to survive.
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,Nitrogen - Correct answer-...is one of the four elements that make up 96.3% of
living cells.
Calcium - Correct answer-...is one of the seven elements that make up a small
fraction, approximately 3.7%, of living cells.
Zinc - Correct answer-...is one of the fourteen trace elements and is a component of
certain digestive enzymes and other proteins.
A(n) ______ forms when one atom gives up one or more electrons to another atom.
- Correct answer-ionic bond
Atoms or molecules with a net electric charge due to the loss or gain of one or
more electrons are ___. - Correct answer-Ions
A(n) _____ involves the sharing of electron pairs between atoms, also known as a
molecular bond. - Correct answer-covalent bond
When one pair of electrons is shared between two atoms, a _____ is formed. -
Correct answer-single bond
When two pairs of electrons are shared between two atoms, a _____ is formed. -
Correct answer-double bond
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, A ____ is a type of chemical bond where a pair of electrons is unequally shared
between two atoms. As a result, one end of the molecule has a slightly negative
charge and the other a slightly positive charge. - Correct answer-polar bond
Atoms involved in a _____ equally share electrons; there is no charge separation to
the molecule. - Correct answer-non-polar bond
A weak bond called a _____ results from an attraction between a slightly positive
region in a molecule and a slightly negative region in the same or a different
molecule. - Correct answer-hydrogen bond
What is responsible for the unusual chemical properties of water? - Correct
answer-Water molecules can form an extensive network of hydrogen bonds with
one another.
A
B
C
D
E
F
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questions Complete answers 2026
Elements - Correct answer-__________ are substances that CANNOT be broken
down into other substances by chemical reactions
Which four elements make up the bulk of living cells? - Correct answer-oxygen,
carbon, hydrogen, and nitrogen
Atomic number - Correct answer-...is the number of protons in the nucleus of an
atom, which determines the chemical properties of an element and its place in the
periodic table.
Atomic Weight - Correct answer-The number of protons plus neutrons in an atom,
represented as an average of all naturally occurring forms of the element, is known
as...
Trace elements - Correct answer-... also called micronutrients, are any chemical
element required by living organisms in minuscule amounts, but cells require them
to survive.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Nitrogen - Correct answer-...is one of the four elements that make up 96.3% of
living cells.
Calcium - Correct answer-...is one of the seven elements that make up a small
fraction, approximately 3.7%, of living cells.
Zinc - Correct answer-...is one of the fourteen trace elements and is a component of
certain digestive enzymes and other proteins.
A(n) ______ forms when one atom gives up one or more electrons to another atom.
- Correct answer-ionic bond
Atoms or molecules with a net electric charge due to the loss or gain of one or
more electrons are ___. - Correct answer-Ions
A(n) _____ involves the sharing of electron pairs between atoms, also known as a
molecular bond. - Correct answer-covalent bond
When one pair of electrons is shared between two atoms, a _____ is formed. -
Correct answer-single bond
When two pairs of electrons are shared between two atoms, a _____ is formed. -
Correct answer-double bond
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, A ____ is a type of chemical bond where a pair of electrons is unequally shared
between two atoms. As a result, one end of the molecule has a slightly negative
charge and the other a slightly positive charge. - Correct answer-polar bond
Atoms involved in a _____ equally share electrons; there is no charge separation to
the molecule. - Correct answer-non-polar bond
A weak bond called a _____ results from an attraction between a slightly positive
region in a molecule and a slightly negative region in the same or a different
molecule. - Correct answer-hydrogen bond
What is responsible for the unusual chemical properties of water? - Correct
answer-Water molecules can form an extensive network of hydrogen bonds with
one another.
A
B
C
D
E
F
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
