BCHS 3304 Test 1 || with Complete Solution.
If completely dehydrated, human body would have _____ as the most abundant
element. correct answers Carbon (C)
About evolution, which of the following statement is NOT true? correct answers -Evolution is
ongoing
-Evolution is constrained by its past
-Evolution is not goal directed
***Evolution is about selection for the best traits, therefore no sloppiness is tolerated.
-All the above is true
The first thermodynamic law says _____ correct answers Energy cannot be created or destroyed.
It can only be conserved.
Which of the following represents an increase in entropy? correct answers -Gas is compressed to
a smaller volume
-A salt solution crystalizes
-A reaction releases heat to the surroundings
***2NH3--->N2+3NH2
-all the above
If ____, a reaction would be spontaneous regardless of temperature. correct answers ΔH<0 and
ΔS>0
About free energy change and enzyme catalyst, which of the following
statements is true? correct answers Enzymes accelerate reactions but it cannot change ΔG
, Rank the following interactions in order of increasing strength (start with the weakest
interaction). correct answers London dispersion forces, hydrogen bonds, ionic interactions,
covalent bonds.
Liquid water freezes to become ice. In this process, there is ______ correct answers Decrease in
entropy, decrease in density
The following structures illustrate hydrogen bonds between water and other organic functional
groups. In ____, the functional group acts as both hydrogen bond acceptor and donor. correct
answers figure a
Please name the following functional group. (Look at the diagram) correct answers Ester
A substance with the following structure is likely _____ (Look at chain diagram) correct answers
Amphiphilic
Which of the following statements about water is incorrect? correct answers -Water is an
excellent solvent for polar molecules.
-Pure water has a concentration of approximately 55.5 M.
-Cations are solvated by shells of water molecules oriented with their oxygen atoms pointed
toward the ions.
-Nonpolar molecules do not dissolve in water, but form a separate phase.
***Amphiphilic detergents often form micelles with the nonpolar groups on the outside exposed
to water (solvent) and the polar groups sequestered in the interior.
Which of the following is the best explanation for the hydrophobic effect? correct answers -It is
caused by an affinity of hydrophobic groups for each other.
-is caused by the affinity of water for hydrophobic groups.
-It is an entropic effect, caused by the desire of water molecules to increase their entropy by
forming highly ordered structures around the hydrophobic groups.
If completely dehydrated, human body would have _____ as the most abundant
element. correct answers Carbon (C)
About evolution, which of the following statement is NOT true? correct answers -Evolution is
ongoing
-Evolution is constrained by its past
-Evolution is not goal directed
***Evolution is about selection for the best traits, therefore no sloppiness is tolerated.
-All the above is true
The first thermodynamic law says _____ correct answers Energy cannot be created or destroyed.
It can only be conserved.
Which of the following represents an increase in entropy? correct answers -Gas is compressed to
a smaller volume
-A salt solution crystalizes
-A reaction releases heat to the surroundings
***2NH3--->N2+3NH2
-all the above
If ____, a reaction would be spontaneous regardless of temperature. correct answers ΔH<0 and
ΔS>0
About free energy change and enzyme catalyst, which of the following
statements is true? correct answers Enzymes accelerate reactions but it cannot change ΔG
, Rank the following interactions in order of increasing strength (start with the weakest
interaction). correct answers London dispersion forces, hydrogen bonds, ionic interactions,
covalent bonds.
Liquid water freezes to become ice. In this process, there is ______ correct answers Decrease in
entropy, decrease in density
The following structures illustrate hydrogen bonds between water and other organic functional
groups. In ____, the functional group acts as both hydrogen bond acceptor and donor. correct
answers figure a
Please name the following functional group. (Look at the diagram) correct answers Ester
A substance with the following structure is likely _____ (Look at chain diagram) correct answers
Amphiphilic
Which of the following statements about water is incorrect? correct answers -Water is an
excellent solvent for polar molecules.
-Pure water has a concentration of approximately 55.5 M.
-Cations are solvated by shells of water molecules oriented with their oxygen atoms pointed
toward the ions.
-Nonpolar molecules do not dissolve in water, but form a separate phase.
***Amphiphilic detergents often form micelles with the nonpolar groups on the outside exposed
to water (solvent) and the polar groups sequestered in the interior.
Which of the following is the best explanation for the hydrophobic effect? correct answers -It is
caused by an affinity of hydrophobic groups for each other.
-is caused by the affinity of water for hydrophobic groups.
-It is an entropic effect, caused by the desire of water molecules to increase their entropy by
forming highly ordered structures around the hydrophobic groups.
