BIO-100 Exam 5 Practice Test
Questions with Guaranteed Pass
Solutions 2025\2026 Edition.
elements - Answer substances that cannot be broken down into simpler substances by chemical
reactions
92 - Answer There are ___ naturally occurring elements
atomic number - Answer Signifies the number of protons an element has on the periodic table
atomic weight - Answer Signifies the number of protons + the number of neutrons an element
has on the periodic table
neutrons - Answer Atomic weight often appears as a decimal because it averages all naturally
occurring forms of the element, which vary in number of ____
25 - Answer How many of the naturally occurring elements are used by the human body?
carbon, oxygen, hydrogen, nitrogen - Answer Name the four elements that make up the
majority of living matter.
trace elements - Answer 14 elements such as zinc and iron which the body requires only in very
small amounts
protons and neutrons - Answer Which two atoms located in the nucleus have about the same
mass?
electron shells - Answer specific locations in which electrons rotate around the nucleus
These interactions determine the chemical bonds of the atom - Answer What is the significance
of electrons in the outer shell interacting with electrons of other atoms?
, neutral - Answer Atoms are electrically ____
extra - Answer N3- carries three ____ electrons
Ionic bond - Answer transfer of electrons from one atom to another; both ions then held
together by attraction of opposite charge
covalent bond - Answer each atom shares one electron with the other, forming a pair; this type
of bond holds atoms together within molecules
polar - Answer When the sharing of electrons in a covalent bond is unequal, the bond is ____
Overall neutral, with one positive pole and one negative pole - Answer Describe the charge of a
molecule created by a polar covalent bond.
hydrogen bond - Answer weak chemical bond of one partially positive hydrogen atom to a
partially negative atom from another polar molecule; networks of this type of bond are strong
enough to form liquid water
organic compounds - Answer molecules that contain carbon bonded to other elements; make
up most living matter (after water)
carbon; four - Answer Which element forms the skeleton of organic compounds? With how
many other atoms can it bond?
functional groups - Answer sets of atoms attached to the carbon skeleton which determine the
chemical properties of the organic compound
carbohydrates (cellulose & glucose), lipids (cholesterol), proteins (keratin), nucleic acids (DNA &
RNA) - Answer Name the four classes of biologically important organic compounds, and try to
provide an example of each.
water; macromolecules - Answer ____ comprises majority of body weight; the rest consists of
____
Questions with Guaranteed Pass
Solutions 2025\2026 Edition.
elements - Answer substances that cannot be broken down into simpler substances by chemical
reactions
92 - Answer There are ___ naturally occurring elements
atomic number - Answer Signifies the number of protons an element has on the periodic table
atomic weight - Answer Signifies the number of protons + the number of neutrons an element
has on the periodic table
neutrons - Answer Atomic weight often appears as a decimal because it averages all naturally
occurring forms of the element, which vary in number of ____
25 - Answer How many of the naturally occurring elements are used by the human body?
carbon, oxygen, hydrogen, nitrogen - Answer Name the four elements that make up the
majority of living matter.
trace elements - Answer 14 elements such as zinc and iron which the body requires only in very
small amounts
protons and neutrons - Answer Which two atoms located in the nucleus have about the same
mass?
electron shells - Answer specific locations in which electrons rotate around the nucleus
These interactions determine the chemical bonds of the atom - Answer What is the significance
of electrons in the outer shell interacting with electrons of other atoms?
, neutral - Answer Atoms are electrically ____
extra - Answer N3- carries three ____ electrons
Ionic bond - Answer transfer of electrons from one atom to another; both ions then held
together by attraction of opposite charge
covalent bond - Answer each atom shares one electron with the other, forming a pair; this type
of bond holds atoms together within molecules
polar - Answer When the sharing of electrons in a covalent bond is unequal, the bond is ____
Overall neutral, with one positive pole and one negative pole - Answer Describe the charge of a
molecule created by a polar covalent bond.
hydrogen bond - Answer weak chemical bond of one partially positive hydrogen atom to a
partially negative atom from another polar molecule; networks of this type of bond are strong
enough to form liquid water
organic compounds - Answer molecules that contain carbon bonded to other elements; make
up most living matter (after water)
carbon; four - Answer Which element forms the skeleton of organic compounds? With how
many other atoms can it bond?
functional groups - Answer sets of atoms attached to the carbon skeleton which determine the
chemical properties of the organic compound
carbohydrates (cellulose & glucose), lipids (cholesterol), proteins (keratin), nucleic acids (DNA &
RNA) - Answer Name the four classes of biologically important organic compounds, and try to
provide an example of each.
water; macromolecules - Answer ____ comprises majority of body weight; the rest consists of
____
