Bio 100 Exam 1 - mastering biology
UPDATED ACTUAL Exam Questions and
CORRECT Answers
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.
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
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
UPDATED ACTUAL Exam Questions and
CORRECT Answers
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.
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
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
