BIO 348- EXAM QUESTIONS WITH
COMPLETE SOLUTIONS.
A base is a molecule that will __________ a
proton in water
Choose one:
A. accept
B. donate
C. repel
D. neutralize - correct answer - A. Accept
A cell's plasma membrane with a greater
degree of _________ hydrocarbons will exhibit
less fluidity at room temperature - correct
answer - Saturated
More saturated hydrocarbons is associated
with a denser, more solid substance as
opposed to more fluid and dense
,A molecule with a lot of polar covalent bonds
is likely to
Choose one:
A. be highly soluble in water.
B. be hydrophobic.
C. contain only atoms with low
electronegativity.
D. form ionic bonds. - correct answer - A. Be
highly soluble in water
Polar covalent bonds are formed when two
atoms unequally share an electron, forming
partial positive and partial negative charges
at either end of the bond. Water also has
partial positive and negative charges, and
thus will easily interact with other molecules'
partial charges, thus making it soluble.
A protein can be unfolded by a process called
- correct answer - Denaturation
,A protein can be unfolded, or denatured, by
treatment with solvents that disrupt the
noncovalent interactions holding the folded
chain together. This treatment converts the
protein into a flexible polypeptide chain that
has lost its natural shape.
A reaction occurs spontaneously only if the
change in free energy (change G) is
Positive
Negative
Neutral - correct answer - Negative
A reaction occurs spontaneously only if the
change in free energy (ΔG) is negative, which
means that it is increasing the disorder in the
system by decreasing the free energy
, All of the following are true concerning
enzymes except which statement?
A. They can bring reactants together in the
proper orientation for chemistry to occur.
B. They require an input of energy from ATP
for activation.
C. They can change the shape of substrates to
increase the rate of a particular reaction.
D. They can form covalent bonds with their
substrates. - correct answer - B. They
require an input of energy from ATP for
activation
Enzymes do not alter the overall
thermodynamics of a reaction; they merely
alter the kinetics, meaning they speed up the
rate of a biochemical reaction. It is meaningful
to note, however, that ATP, while not required
for all enzymatic reactions, is used by certain
enzymes (i.e., kinases).
COMPLETE SOLUTIONS.
A base is a molecule that will __________ a
proton in water
Choose one:
A. accept
B. donate
C. repel
D. neutralize - correct answer - A. Accept
A cell's plasma membrane with a greater
degree of _________ hydrocarbons will exhibit
less fluidity at room temperature - correct
answer - Saturated
More saturated hydrocarbons is associated
with a denser, more solid substance as
opposed to more fluid and dense
,A molecule with a lot of polar covalent bonds
is likely to
Choose one:
A. be highly soluble in water.
B. be hydrophobic.
C. contain only atoms with low
electronegativity.
D. form ionic bonds. - correct answer - A. Be
highly soluble in water
Polar covalent bonds are formed when two
atoms unequally share an electron, forming
partial positive and partial negative charges
at either end of the bond. Water also has
partial positive and negative charges, and
thus will easily interact with other molecules'
partial charges, thus making it soluble.
A protein can be unfolded by a process called
- correct answer - Denaturation
,A protein can be unfolded, or denatured, by
treatment with solvents that disrupt the
noncovalent interactions holding the folded
chain together. This treatment converts the
protein into a flexible polypeptide chain that
has lost its natural shape.
A reaction occurs spontaneously only if the
change in free energy (change G) is
Positive
Negative
Neutral - correct answer - Negative
A reaction occurs spontaneously only if the
change in free energy (ΔG) is negative, which
means that it is increasing the disorder in the
system by decreasing the free energy
, All of the following are true concerning
enzymes except which statement?
A. They can bring reactants together in the
proper orientation for chemistry to occur.
B. They require an input of energy from ATP
for activation.
C. They can change the shape of substrates to
increase the rate of a particular reaction.
D. They can form covalent bonds with their
substrates. - correct answer - B. They
require an input of energy from ATP for
activation
Enzymes do not alter the overall
thermodynamics of a reaction; they merely
alter the kinetics, meaning they speed up the
rate of a biochemical reaction. It is meaningful
to note, however, that ATP, while not required
for all enzymatic reactions, is used by certain
enzymes (i.e., kinases).
