WGU C190 BIOLOGY EXAMPREP QUESTIONS
AND DETAILED SOLUTIONS
◉ Natural Selection.
Answer: Individuals are always a bit different from their parents and
from each other, partly because of changes to their genes. These
differences may be helpful or harmful to the individuals that inherit
them. In nature, individuals often have very low odds of surviving to
reproduce. Individuals with slightly harmful or even average
characteristics might be less likely to make it, and those with traits
that fit in very well with the local habitat will have the greatest
chance to survive and reproduce. This sorting process goes on
generation after generation.
◉ Atomic Mass.
Answer: The sum of the number of protons and the number of
neutrons. The mass of an atom.
◉ Atomic Number.
Answer: The number of protons in an atom, displayed for each atom
in the periodic table.
◉ Chemical Bonds.
,Answer: Attractions between atoms that hold atoms and molecules
together.
◉ Covalent Bonds.
Answer: Strongest chemical bond. Occurs between atoms of in the
same molecule. Electron pairs are shared, creating a strong bond
between atoms.
◉ electron.
Answer: Subatomic particle, located in shells on the outside of the
nucleus, has a negative charge and almost no mass.
◉ electronegativity.
Answer: A measure of the tendency of an atom to attract a bonding
pair of electrons. How strongly does an atoms attract bonding
electrons to itself?
◉ element.
Answer: Atoms with unique properties, designated by the atomic
number.
◉ hydrogen bond.
,Answer: Weak chemical bond. Occurs between atoms in different
molecules or parts of molecules. Weak electrostatic attraction
between areas of molecules with opposite partial charges.
◉ ion.
Answer: Positively or negatively charged atom.
◉ ionic bond.
Answer: Moderately strong chemical bond. Occurs between atoms in
the same molecule. Electrons transfer from one atom to another.
◉ isotope.
Answer: Any or two or more forms of a chemical element, having the
same number of protons in the nucleus, or the same atomic number,
but having different numbers of neutrons in the nucleus, or different
atomic weights.
◉ matter.
Answer: Anything that occupies space and has mass.
◉ molecular formula.
Answer: A formula giving the number of atoms of each of the
elements present in one molecule of a specific compound.
, ◉ neutron.
Answer: Subatomic particle, electrically neutral, located in the
nucleus. Mass of one amu
◉ nucleus.
Answer: Center of the atom. Contains equal number of protons and
neutrons.
◉ Periodic Table.
Answer: Chart organizing elements by atomic number and weight.
◉ proton.
Answer: Subatomic particle, located in the nucleus, with a positive
charge. Mass of one amu.
◉ valence electron.
Answer: Electrons on the outermost shell of the atom. Involved in
chemical bonds.
◉ Adhesion.
Answer: The attraction between water molecules and other
molecules.
AND DETAILED SOLUTIONS
◉ Natural Selection.
Answer: Individuals are always a bit different from their parents and
from each other, partly because of changes to their genes. These
differences may be helpful or harmful to the individuals that inherit
them. In nature, individuals often have very low odds of surviving to
reproduce. Individuals with slightly harmful or even average
characteristics might be less likely to make it, and those with traits
that fit in very well with the local habitat will have the greatest
chance to survive and reproduce. This sorting process goes on
generation after generation.
◉ Atomic Mass.
Answer: The sum of the number of protons and the number of
neutrons. The mass of an atom.
◉ Atomic Number.
Answer: The number of protons in an atom, displayed for each atom
in the periodic table.
◉ Chemical Bonds.
,Answer: Attractions between atoms that hold atoms and molecules
together.
◉ Covalent Bonds.
Answer: Strongest chemical bond. Occurs between atoms of in the
same molecule. Electron pairs are shared, creating a strong bond
between atoms.
◉ electron.
Answer: Subatomic particle, located in shells on the outside of the
nucleus, has a negative charge and almost no mass.
◉ electronegativity.
Answer: A measure of the tendency of an atom to attract a bonding
pair of electrons. How strongly does an atoms attract bonding
electrons to itself?
◉ element.
Answer: Atoms with unique properties, designated by the atomic
number.
◉ hydrogen bond.
,Answer: Weak chemical bond. Occurs between atoms in different
molecules or parts of molecules. Weak electrostatic attraction
between areas of molecules with opposite partial charges.
◉ ion.
Answer: Positively or negatively charged atom.
◉ ionic bond.
Answer: Moderately strong chemical bond. Occurs between atoms in
the same molecule. Electrons transfer from one atom to another.
◉ isotope.
Answer: Any or two or more forms of a chemical element, having the
same number of protons in the nucleus, or the same atomic number,
but having different numbers of neutrons in the nucleus, or different
atomic weights.
◉ matter.
Answer: Anything that occupies space and has mass.
◉ molecular formula.
Answer: A formula giving the number of atoms of each of the
elements present in one molecule of a specific compound.
, ◉ neutron.
Answer: Subatomic particle, electrically neutral, located in the
nucleus. Mass of one amu
◉ nucleus.
Answer: Center of the atom. Contains equal number of protons and
neutrons.
◉ Periodic Table.
Answer: Chart organizing elements by atomic number and weight.
◉ proton.
Answer: Subatomic particle, located in the nucleus, with a positive
charge. Mass of one amu.
◉ valence electron.
Answer: Electrons on the outermost shell of the atom. Involved in
chemical bonds.
◉ Adhesion.
Answer: The attraction between water molecules and other
molecules.
