Biology 1406 Exam #1 Test Questions and Answers Rated A
Biology the scientific study of life
a suggested explanation for an observation which can be
Hypothesis
tested
Theory a tested observation with an explanation
Small --to--> Big
Atom - molecule - macromolecules - organelles - cells, tis-
Levels of Organization
sues - organs - organ system - organ system - organisms
- populations - communities - ecosystems - biosphere
-Archaea
Diversity of Life: The 3 Domains -Bacteria
-Eukarya
smallest functional units of matter that form all chemical
atom
substances and thus organisms
substance that cannot be broken down to other sub-
element
stances by chemical reactions
atoms of the same element that have ditterent numbers of
isotope
neutrons or ditterent atomic forms of the same element.
molecule two or more atoms held together by covalent bonds
an atom or group of atoms that has gained or lost one or
ion
more electrons, thus acquiring a charge
cation positively charged ion
mass number number of protons + neutrons
atomic number number of protons
number of neutrons = mass number - atomic number
Describe the basic structure of the atom
, Biology 1406 Exam #1 Test Questions and Answers Rated A
An atom is the smallest unit of matter that defines an
element. This unit consists of a nucleus surrounded by or-
biting, negatively charged electrons. The nucleus contains
positively charged protons and, most often, neutral neu-
trons. The number of protons in the nucleus determines
the number of electrons, maintaining electrical neutrality,
and the fundamental nature of the atom. Also, as tiny as
atoms are, they still consist mostly of empty space.
attractive force between oppositely charged ion, anion
and cation
ionic bond
sharing of electrons - may be equal or unequal sharing
covalent bond
uneven sharing of pairs of electrons, determined by the
electronegativity of atoms in the molecule, creates slight
positive or negative charges in ditterent regions of the
molecule
polar covalent bond
Biology the scientific study of life
a suggested explanation for an observation which can be
Hypothesis
tested
Theory a tested observation with an explanation
Small --to--> Big
Atom - molecule - macromolecules - organelles - cells, tis-
Levels of Organization
sues - organs - organ system - organ system - organisms
- populations - communities - ecosystems - biosphere
-Archaea
Diversity of Life: The 3 Domains -Bacteria
-Eukarya
smallest functional units of matter that form all chemical
atom
substances and thus organisms
substance that cannot be broken down to other sub-
element
stances by chemical reactions
atoms of the same element that have ditterent numbers of
isotope
neutrons or ditterent atomic forms of the same element.
molecule two or more atoms held together by covalent bonds
an atom or group of atoms that has gained or lost one or
ion
more electrons, thus acquiring a charge
cation positively charged ion
mass number number of protons + neutrons
atomic number number of protons
number of neutrons = mass number - atomic number
Describe the basic structure of the atom
, Biology 1406 Exam #1 Test Questions and Answers Rated A
An atom is the smallest unit of matter that defines an
element. This unit consists of a nucleus surrounded by or-
biting, negatively charged electrons. The nucleus contains
positively charged protons and, most often, neutral neu-
trons. The number of protons in the nucleus determines
the number of electrons, maintaining electrical neutrality,
and the fundamental nature of the atom. Also, as tiny as
atoms are, they still consist mostly of empty space.
attractive force between oppositely charged ion, anion
and cation
ionic bond
sharing of electrons - may be equal or unequal sharing
covalent bond
uneven sharing of pairs of electrons, determined by the
electronegativity of atoms in the molecule, creates slight
positive or negative charges in ditterent regions of the
molecule
polar covalent bond
