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BIOLOGY 93 UCI MIDTERM 1 KEY
TERMS ACTUAL 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
Hypothesis - (ANSWER)a tentative answer to a well framed question - an
explanation on trial
Prediction - (ANSWER)A logical statement about what will happen if the
hypothesis is correct.
Experiment - (ANSWER)a repeatable procedure that is used to test a hypothesis
(a scientific test carried under controlled condition)
Variable - (ANSWER)factors that vary in an experiment
Controlled Experiment - (ANSWER)An experiment in which all factors are
identical except the one being tested. Compares an experimental group with a
control group
Independent Variable - (ANSWER)the factor manipulated by the researchers
Dependent Variable - (ANSWER)a factor that is measured in the experiment
Theory - (ANSWER)1)Broader than a hypothesis. 2)broad enough to spin off many
new hypotheses that can be tested. 3) Supported by a great body of evidence
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Science - (ANSWER)an approach to understanding the natural world
Element - (ANSWER)is a chemical substance that cannot be broken down to other
substances
Compound - (ANSWER)a substance consisting of 2 or more different elements
combined in a fixed ratio.
Neutron - (ANSWER)a atomic particle that is electrically neutral (0)
Proton - (ANSWER)a atomic particle with one unit of positive charge
Electron - (ANSWER)a atomic particle with one unit of negative charge
Atom - (ANSWER)smallest unit of matter that still retains the properties of an
element. Made up of a neutron/proton nucleus, and shell(s) of electrons
Covalent Bond - (ANSWER)is the sharing of a pair of valence electrons by two
atoms.
Molecule - (ANSWER)two or more atoms held together by covalent bonds
constitute a molecule
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Single bond - (ANSWER)a covalent bond in which two atoms share one pair of
electrons
Double Bond - (ANSWER)a covalent bond produced by the sharing of two pairs of
electrons between two atoms
Valence - (ANSWER)Electrons on the outermost energy level of an atom:
electrons that form bonds.
Electronegativity - (ANSWER)Atom's ability to attract and hold electrons.
Non polar Covalent Bond - (ANSWER)a bond where electrons are shared equally
among two atoms or where symmetric structure causes polarity to cancel out.
Polar Covalent Bond - (ANSWER)Where asymmetric structure and unequal
sharing of electrons between two atoms with different electronegativity values
create partial charges within the molecule.
Ionic Bond - (ANSWER)When an electron is attracted to another atom of higher
electronegativity and the resulting charges create a ionic attraction.
Ion - (ANSWER)A charged atom or group of atoms that is charged due to a net
loss or gain of electrons
BIOLOGY 93 UCI MIDTERM 1 KEY
TERMS ACTUAL 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
Hypothesis - (ANSWER)a tentative answer to a well framed question - an
explanation on trial
Prediction - (ANSWER)A logical statement about what will happen if the
hypothesis is correct.
Experiment - (ANSWER)a repeatable procedure that is used to test a hypothesis
(a scientific test carried under controlled condition)
Variable - (ANSWER)factors that vary in an experiment
Controlled Experiment - (ANSWER)An experiment in which all factors are
identical except the one being tested. Compares an experimental group with a
control group
Independent Variable - (ANSWER)the factor manipulated by the researchers
Dependent Variable - (ANSWER)a factor that is measured in the experiment
Theory - (ANSWER)1)Broader than a hypothesis. 2)broad enough to spin off many
new hypotheses that can be tested. 3) Supported by a great body of evidence
,2
Science - (ANSWER)an approach to understanding the natural world
Element - (ANSWER)is a chemical substance that cannot be broken down to other
substances
Compound - (ANSWER)a substance consisting of 2 or more different elements
combined in a fixed ratio.
Neutron - (ANSWER)a atomic particle that is electrically neutral (0)
Proton - (ANSWER)a atomic particle with one unit of positive charge
Electron - (ANSWER)a atomic particle with one unit of negative charge
Atom - (ANSWER)smallest unit of matter that still retains the properties of an
element. Made up of a neutron/proton nucleus, and shell(s) of electrons
Covalent Bond - (ANSWER)is the sharing of a pair of valence electrons by two
atoms.
Molecule - (ANSWER)two or more atoms held together by covalent bonds
constitute a molecule
, 3
Single bond - (ANSWER)a covalent bond in which two atoms share one pair of
electrons
Double Bond - (ANSWER)a covalent bond produced by the sharing of two pairs of
electrons between two atoms
Valence - (ANSWER)Electrons on the outermost energy level of an atom:
electrons that form bonds.
Electronegativity - (ANSWER)Atom's ability to attract and hold electrons.
Non polar Covalent Bond - (ANSWER)a bond where electrons are shared equally
among two atoms or where symmetric structure causes polarity to cancel out.
Polar Covalent Bond - (ANSWER)Where asymmetric structure and unequal
sharing of electrons between two atoms with different electronegativity values
create partial charges within the molecule.
Ionic Bond - (ANSWER)When an electron is attracted to another atom of higher
electronegativity and the resulting charges create a ionic attraction.
Ion - (ANSWER)A charged atom or group of atoms that is charged due to a net
loss or gain of electrons
