BIOLOGY 121 EXAM QUESTIONS WITH
VERIFIED ANSWERS
genetic basis of life - ANSWER-DNA, RNA, Nucleic Acids, Genes, Proteins,
Enzymes
feedback regulation example - ANSWER-eat, stomach signals brain to decrease
appetite
evolution - ANSWER-change in a kind of organism over time; process by which
modern organisms have descended from ancient organisms - all plants have
chloroplasts indicating their descent from a common ancestor
elements - ANSWER-a molecule composed of one kind of atom; cannot be broken
into simpler units by chemical reactions.
compound - ANSWER-substance formed by the chemical combination of two or
more elements in definite proportions
atom - ANSWER-the smallest unit of an element has
nucleus,protons,neutrons,atom,electrons.
atomic number - ANSWER-the number of protons in an atom
atomic mass - ANSWER-equal to sum of protons+neutrons measured in daltons
isotopes - ANSWER-atoms of the same element that differ in the number of neutrons
they contain
electron shells - ANSWER-an energy level representing the distance of an electron
from the nucleus of an atom.
valence shell - ANSWER-the outermost energy shell of an atom, containing the
valence electrons involved in the chemical reactions of that atom
orbitals - ANSWER-regions around the nucleus in which given electron or electron
pair is likely to be found
chemical bonds - ANSWER-the attractive forces that hold atoms together
covalent bonds - ANSWER-a type of strong chemical bond in which two atoms share
one pair of valence electrons
molecules - ANSWER-Chemicals that result from atoms linking together
electronegativity - ANSWER-The ability of an atom to attract electrons when the
atom is in a compound
, nonpolar covalent bond - ANSWER-covalent bond where electrons are shared
equally
polar covalent bond - ANSWER-a covalent bond in which electrons are not shared
equally
ion - ANSWER-atom that has a positive or negative charge
ionic bond - ANSWER-bond formed when one or more electrons are transferred from
one atom to another
hydrogen bond - ANSWER-bond created by the weak attraction of a slightly positive
hydrogen atom to a slightly negative portion of another molecule
inquiry - ANSWER-scientists make observations by collecting data
inductive reasoning - ANSWER-drawing a general conclusion
hypothesis - ANSWER-a proposal intended to explain certain facts or observations
deductive reasoning - ANSWER-predictions that can be used to test hypotheses
made from inductive reasoning
controlled experiments - ANSWER-designed to demonstrate effect of 1 variable by
testing control groups and experimental groups that differ in only that one variable
scientific theory - ANSWER-generated new hypotheses that is supported by large
body of evidence
technology - ANSWER-method or device that applies scientific knowledge for some
specific purpose that affects society
molecule - ANSWER-consists of atoms
organelle has - ANSWER-orderely arrangement of molecules
photosynthetic plant cells - ANSWER-contain organelles called chloroplasts
tissue - ANSWER-consists of a group of similar cells
population - ANSWER-set of organisms of the same spieces
community - ANSWER-consists of populations of various species inhabiting a
specific area
ecosystem - ANSWER-consists of a biological community along with the nonliving
factors important to life
biosphere - ANSWER-made up of all earth's ecosystems
VERIFIED ANSWERS
genetic basis of life - ANSWER-DNA, RNA, Nucleic Acids, Genes, Proteins,
Enzymes
feedback regulation example - ANSWER-eat, stomach signals brain to decrease
appetite
evolution - ANSWER-change in a kind of organism over time; process by which
modern organisms have descended from ancient organisms - all plants have
chloroplasts indicating their descent from a common ancestor
elements - ANSWER-a molecule composed of one kind of atom; cannot be broken
into simpler units by chemical reactions.
compound - ANSWER-substance formed by the chemical combination of two or
more elements in definite proportions
atom - ANSWER-the smallest unit of an element has
nucleus,protons,neutrons,atom,electrons.
atomic number - ANSWER-the number of protons in an atom
atomic mass - ANSWER-equal to sum of protons+neutrons measured in daltons
isotopes - ANSWER-atoms of the same element that differ in the number of neutrons
they contain
electron shells - ANSWER-an energy level representing the distance of an electron
from the nucleus of an atom.
valence shell - ANSWER-the outermost energy shell of an atom, containing the
valence electrons involved in the chemical reactions of that atom
orbitals - ANSWER-regions around the nucleus in which given electron or electron
pair is likely to be found
chemical bonds - ANSWER-the attractive forces that hold atoms together
covalent bonds - ANSWER-a type of strong chemical bond in which two atoms share
one pair of valence electrons
molecules - ANSWER-Chemicals that result from atoms linking together
electronegativity - ANSWER-The ability of an atom to attract electrons when the
atom is in a compound
, nonpolar covalent bond - ANSWER-covalent bond where electrons are shared
equally
polar covalent bond - ANSWER-a covalent bond in which electrons are not shared
equally
ion - ANSWER-atom that has a positive or negative charge
ionic bond - ANSWER-bond formed when one or more electrons are transferred from
one atom to another
hydrogen bond - ANSWER-bond created by the weak attraction of a slightly positive
hydrogen atom to a slightly negative portion of another molecule
inquiry - ANSWER-scientists make observations by collecting data
inductive reasoning - ANSWER-drawing a general conclusion
hypothesis - ANSWER-a proposal intended to explain certain facts or observations
deductive reasoning - ANSWER-predictions that can be used to test hypotheses
made from inductive reasoning
controlled experiments - ANSWER-designed to demonstrate effect of 1 variable by
testing control groups and experimental groups that differ in only that one variable
scientific theory - ANSWER-generated new hypotheses that is supported by large
body of evidence
technology - ANSWER-method or device that applies scientific knowledge for some
specific purpose that affects society
molecule - ANSWER-consists of atoms
organelle has - ANSWER-orderely arrangement of molecules
photosynthetic plant cells - ANSWER-contain organelles called chloroplasts
tissue - ANSWER-consists of a group of similar cells
population - ANSWER-set of organisms of the same spieces
community - ANSWER-consists of populations of various species inhabiting a
specific area
ecosystem - ANSWER-consists of a biological community along with the nonliving
factors important to life
biosphere - ANSWER-made up of all earth's ecosystems
