1
BIOLOGY 150 EXAM 1 QUESTIONS WITH
CORRECT ANSWERS 2026
Protons - CORRECT ANSWER ✅:-positive charge
Neutron - CORRECT ANSWER ✅:-neutral charge
Electrons - CORRECT ANSWER ✅:-negative charge
Ion - CORRECT ANSWER ✅:-electrically charged atom(s) formed by the loss
or gain of one or more electrons
Isotopes - CORRECT ANSWER ✅:-forms of an element with different
numbers of neutrons
Atomic Number - CORRECT ANSWER ✅:-number of protons
Atomic Mass - CORRECT ANSWER ✅:-protons+neutrons
Identify the number of electrons in the valence shell of an atom based on the
atomic number, atomic mass, and overall charge. - CORRECT ANSWER ✅:-
pg. 1
,2
The number of electrons in the valance shell is dependent on the atomic number. 2
in the first shell and 8 on each shell after.
Covalent Bond - CORRECT ANSWER ✅:-strong attraction where 2 atoms
share electrons
Nonpolar Covalent Bond - CORRECT ANSWER ✅:-equally shared electrons
Polar Covalent Bond - CORRECT ANSWER ✅:-not equally shared, spends
most of its time closest to the nucleus of the more electronegative atom.
Ionic Bond - CORRECT ANSWER ✅:-electrons in one atom are completely
transferred from one atom to the other
Positive Charge - CORRECT ANSWER ✅:-atom has more protons than
electrons
Negative Charge - CORRECT ANSWER ✅:-atom has more electrons than
protons
Ion - CORRECT ANSWER ✅:-atom that has a full charge
Cation - CORRECT ANSWER ✅:-positively charged ion
Anion - CORRECT ANSWER ✅:-negatively charged ion
pg. 2
, 3
Hydrogen Bond - CORRECT ANSWER ✅:-weak attraction between a
hydrogen atom with a partial positive charge and another atom (oxygen or
nitrogen) with a partial negative charge
Predict the number of covalent bonds formed between atoms based on atomic
number or number of electrons in valence shell. - CORRECT ANSWER ✅:-In
covalent bonds you can predict the number of bonds an atom will form by looking
at its valence electrons in its outer shell. An atom tends to fill its outer shell by
sharing electron with other atoms. The number of electrons in an atoms outer shell
determines the number of bonds it can make
Aqueous - CORRECT ANSWER ✅:-water based environment in which
chemical reactions occur Hydrophillic - CORRECT ANSWER ✅:-Ion and polar
molecules that stay in water because of their interactions with water's partial
charges. (love water)
Hydrophobic - CORRECT ANSWER ✅:-nonpolar molecules that don't interact
with water or dissolve in aqueous solutions. (hate water; fats)
pg. 3
BIOLOGY 150 EXAM 1 QUESTIONS WITH
CORRECT ANSWERS 2026
Protons - CORRECT ANSWER ✅:-positive charge
Neutron - CORRECT ANSWER ✅:-neutral charge
Electrons - CORRECT ANSWER ✅:-negative charge
Ion - CORRECT ANSWER ✅:-electrically charged atom(s) formed by the loss
or gain of one or more electrons
Isotopes - CORRECT ANSWER ✅:-forms of an element with different
numbers of neutrons
Atomic Number - CORRECT ANSWER ✅:-number of protons
Atomic Mass - CORRECT ANSWER ✅:-protons+neutrons
Identify the number of electrons in the valence shell of an atom based on the
atomic number, atomic mass, and overall charge. - CORRECT ANSWER ✅:-
pg. 1
,2
The number of electrons in the valance shell is dependent on the atomic number. 2
in the first shell and 8 on each shell after.
Covalent Bond - CORRECT ANSWER ✅:-strong attraction where 2 atoms
share electrons
Nonpolar Covalent Bond - CORRECT ANSWER ✅:-equally shared electrons
Polar Covalent Bond - CORRECT ANSWER ✅:-not equally shared, spends
most of its time closest to the nucleus of the more electronegative atom.
Ionic Bond - CORRECT ANSWER ✅:-electrons in one atom are completely
transferred from one atom to the other
Positive Charge - CORRECT ANSWER ✅:-atom has more protons than
electrons
Negative Charge - CORRECT ANSWER ✅:-atom has more electrons than
protons
Ion - CORRECT ANSWER ✅:-atom that has a full charge
Cation - CORRECT ANSWER ✅:-positively charged ion
Anion - CORRECT ANSWER ✅:-negatively charged ion
pg. 2
, 3
Hydrogen Bond - CORRECT ANSWER ✅:-weak attraction between a
hydrogen atom with a partial positive charge and another atom (oxygen or
nitrogen) with a partial negative charge
Predict the number of covalent bonds formed between atoms based on atomic
number or number of electrons in valence shell. - CORRECT ANSWER ✅:-In
covalent bonds you can predict the number of bonds an atom will form by looking
at its valence electrons in its outer shell. An atom tends to fill its outer shell by
sharing electron with other atoms. The number of electrons in an atoms outer shell
determines the number of bonds it can make
Aqueous - CORRECT ANSWER ✅:-water based environment in which
chemical reactions occur Hydrophillic - CORRECT ANSWER ✅:-Ion and polar
molecules that stay in water because of their interactions with water's partial
charges. (love water)
Hydrophobic - CORRECT ANSWER ✅:-nonpolar molecules that don't interact
with water or dissolve in aqueous solutions. (hate water; fats)
pg. 3
