BIO 105 EXAM 1 MOCK TEST WITH ANSWER
RATIONALES 2026
◉ electron shell.
Answer: a grouping of electrons surrounding the nucleus of an atom
(location of electrons)
◉ valence shell.
Answer: outermost electron shell of an atom
◉ valence electrons.
Answer: electrons in the outermost shell (H and He ONLY!!!)
◉ octet rule.
Answer: state that atoms lose, gain or share electrons in order to
acquire a full set of eight valence electrons
◉ compound.
Answer: a substance made up of atoms of two or more different
elements joined by chemical bonds
◉ ionic bond.
,Answer: formed when one or more electrons are transferred from
one atom to another
◉ ion.
Answer: a charged atom
◉ covalent bond.
Answer: a chemical bond formed when two atoms share electrons
(single/double/triple)
◉ chemical formula.
Answer: a combination of chemical symbols and numbers to
represent a substance
◉ chemical structure.
Answer: the arrangement of atoms in a substance
◉ bond energy.
Answer: energy required to break a bond
◉ 1 bond (hydrogen).
Answer: How many bonds does Hydrogen have?
, ◉ 2 bonds (oxygen).
Answer: How many bonds does Oxygen have?
◉ 4 bonds (carbon.
Answer: How many bonds does Carbon have?
◉ carbon.
Answer: very stable and super versatile
◉ functional group.
Answer: elements attached to carbon (hands/feet of carbon
backbone)
◉ 3 bonds (nitrogen and phosphorus).
Answer: How many bonds does Nitrogen and Phosphorus have?
◉ amino acids.
Answer: building blocks of proteins
◉ nucleotide.
Answer: building block of DNA
RATIONALES 2026
◉ electron shell.
Answer: a grouping of electrons surrounding the nucleus of an atom
(location of electrons)
◉ valence shell.
Answer: outermost electron shell of an atom
◉ valence electrons.
Answer: electrons in the outermost shell (H and He ONLY!!!)
◉ octet rule.
Answer: state that atoms lose, gain or share electrons in order to
acquire a full set of eight valence electrons
◉ compound.
Answer: a substance made up of atoms of two or more different
elements joined by chemical bonds
◉ ionic bond.
,Answer: formed when one or more electrons are transferred from
one atom to another
◉ ion.
Answer: a charged atom
◉ covalent bond.
Answer: a chemical bond formed when two atoms share electrons
(single/double/triple)
◉ chemical formula.
Answer: a combination of chemical symbols and numbers to
represent a substance
◉ chemical structure.
Answer: the arrangement of atoms in a substance
◉ bond energy.
Answer: energy required to break a bond
◉ 1 bond (hydrogen).
Answer: How many bonds does Hydrogen have?
, ◉ 2 bonds (oxygen).
Answer: How many bonds does Oxygen have?
◉ 4 bonds (carbon.
Answer: How many bonds does Carbon have?
◉ carbon.
Answer: very stable and super versatile
◉ functional group.
Answer: elements attached to carbon (hands/feet of carbon
backbone)
◉ 3 bonds (nitrogen and phosphorus).
Answer: How many bonds does Nitrogen and Phosphorus have?
◉ amino acids.
Answer: building blocks of proteins
◉ nucleotide.
Answer: building block of DNA
