UCI Bio 93 Midterm 1 UPDATED Questions
and CORRECT 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)
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)
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)
-aldehydes (at the end of skeleton)
carboxyl - CORRECT ANSWER - -is acidic
-weak acid
and CORRECT 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)
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)
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)
-aldehydes (at the end of skeleton)
carboxyl - CORRECT ANSWER - -is acidic
-weak acid
