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