UCI Bio 93- Midterm 1 Exam 2026
Questions and Answers
atoms - Correct answer-smallest unit of chemical elements
molecules - Correct answer-two or more atoms combined
compound - Correct answer-two or more elements combined in a fixed ration
C, O, H, N - Correct answer-... are 4 elements that make up 96% of all living
matter
covalent bond - Correct answer-what is the strongest bond?
covalent - Correct answer-sharing of electrons by two atoms
ionic - Correct answer-transfer of electrons between two atoms
hydrogen bond - Correct answer-what is a weak bond?
hydrogen bond - Correct answer-the H atom forms one covalent bond and a second
weaker bond with an atom in another molecules
nonpolar - Correct answer-equal sharing of electrons
(two of the same element)
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,polar - Correct answer-unequal sharing of electrons
has a charge
(water)
negative - Correct answer-what is the charge of O in water?
positive - Correct answer-what is the charge of H in water?
cohesion - Correct answer-interactions between water molecules
(H2O with H2O)
solvent - Correct answer-interactions between water and other molecules
4 bonds - Correct answer-what is the maximum amount of bonds that hydrogen can
form?
15% - Correct answer-in room temperature of water what % is the maximum
amount of bonds going to be made?
more acidic - Correct answer-when H+ concentration increases...
more basic - Correct answer-what H- concentration decreases...
hydrophilic - Correct answer-affinity for water
(polar and ionic bonds)
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, hydrophobic - Correct answer-repel water
(nonpolar covalent bonds)
buffers - Correct answer-chemical processes are sensitive to pH changes and resist
change in the pH solution
7.4 - Correct answer-the pH of human blood is...
carbonic acid and bicarbonate - Correct answer-what are the main buffers in blood?
right - Correct answer-response to a rise in pH in blood (becomes more basic)
left - Correct answer-response to a drop in pH in blood (becomes more acidic)
carbon atoms - Correct answer-building blocks for biological molecules
4 VE - Correct answer-how many VE does carbon have?
covalent bonds - Correct answer-how do functional groups join to the carbon
skeleton?
hydroxyl - Correct answer--alcohols
-polar
-dissolves organic compounds (like sugars)
carbonyl - Correct answer--ketones (within skeleton)
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Questions and Answers
atoms - Correct answer-smallest unit of chemical elements
molecules - Correct answer-two or more atoms combined
compound - Correct answer-two or more elements combined in a fixed ration
C, O, H, N - Correct answer-... are 4 elements that make up 96% of all living
matter
covalent bond - Correct answer-what is the strongest bond?
covalent - Correct answer-sharing of electrons by two atoms
ionic - Correct answer-transfer of electrons between two atoms
hydrogen bond - Correct answer-what is a weak bond?
hydrogen bond - Correct answer-the H atom forms one covalent bond and a second
weaker bond with an atom in another molecules
nonpolar - Correct answer-equal sharing of electrons
(two of the same element)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,polar - Correct answer-unequal sharing of electrons
has a charge
(water)
negative - Correct answer-what is the charge of O in water?
positive - Correct answer-what is the charge of H in water?
cohesion - Correct answer-interactions between water molecules
(H2O with H2O)
solvent - Correct answer-interactions between water and other molecules
4 bonds - Correct answer-what is the maximum amount of bonds that hydrogen can
form?
15% - Correct answer-in room temperature of water what % is the maximum
amount of bonds going to be made?
more acidic - Correct answer-when H+ concentration increases...
more basic - Correct answer-what H- concentration decreases...
hydrophilic - Correct answer-affinity for water
(polar and ionic bonds)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, hydrophobic - Correct answer-repel water
(nonpolar covalent bonds)
buffers - Correct answer-chemical processes are sensitive to pH changes and resist
change in the pH solution
7.4 - Correct answer-the pH of human blood is...
carbonic acid and bicarbonate - Correct answer-what are the main buffers in blood?
right - Correct answer-response to a rise in pH in blood (becomes more basic)
left - Correct answer-response to a drop in pH in blood (becomes more acidic)
carbon atoms - Correct answer-building blocks for biological molecules
4 VE - Correct answer-how many VE does carbon have?
covalent bonds - Correct answer-how do functional groups join to the carbon
skeleton?
hydroxyl - Correct answer--alcohols
-polar
-dissolves organic compounds (like sugars)
carbonyl - Correct answer--ketones (within skeleton)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
