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Biophysics Exam 1 || All Answers Are Correct 100%.
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True. correct answers A piston containing an ideal gas expands isothermally from 7 atm pressure to 2 atm pressure. The energy of the system (that is, the contents of the piston) remain constant during this process. T/F? a. Even though the protein is negatively charged overall, electrostatic focu...

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  • December 15, 2024
  • 7
  • 2024/2025
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Biophysics Exam 1 || All Answers Are Correct 100%.
True. correct answers A piston containing an ideal gas expands isothermally from 7 atm pressure
to 2 atm pressure. The energy of the system (that is, the contents of the piston) remain constant
during this process. T/F?

a. Even though the protein is negatively charged overall, electrostatic focusing effects provide a
pathway for a negatively charged molecule to enter the active site. correct answers A protein is
negatively charged, but it binds a negatively charged small molecule faster than binds a
positively charged small molecule. The most reasonable explanation for this phenomenon is:

a. Even though the protein is negatively charged overall, electrostatic focusing effects provide a
pathway for a negatively charged molecule to enter the active site.

b. The presence of water molecules screen the electrostatic effects.

c. The negatively charged molecule makes stronger hydrogen bonds than the positively charged
molecule.

d. Charged proteins normally bind substrates with the same overall charge.

c. amount of heat released.
e. energy.
g. number of moles.
h. mass.
i. volume. correct answers Which of the following properties are extensive? (There is more than
one)

a. temperature.
b. pressure.
c. amount of heat released.
d. density.
e. energy.
f. molarity.
g. number of moles.
h. mass.
i. volume.

b. constant pressure. correct answers The enthalpy change for a process is equal to the heat
transferred to the system under which of the following conditions?

a. constant volume.
b. constant pressure.
c. constant temperature.
d. reversible expansion.
e. expansion at a constant pressure followed by reversible compression.

, True. correct answers Energy is a good indicator of the direction of spontaneous change for
macroscopic mechanical objects but not for molecular process. T/F?

b. The potential energy of an atom is the work done in moving the atom from infinity to its
present position. correct answers Which of the following statements about potential energy is
true?

a. The potential energy of an ideal gas is equal to its kinetic energy.

b. The potential energy of an atom is the work done in moving the atom from infinity to its
present position.

c. Potential energy is always absolutely conserved.

d. The potential energy of a system always increase.

e. Potential energy is an intensive function.

a. like a bowl. correct answers The type of function that best describe the energy of a hydrogen
bond as the distance between the hydrogen atom and the acceptor atom varies between 1.5 and
2.5 angstrom:

a. like a bowl.
b. straight line with positive slope.
c. exponential line.
d. waves.

exothermic. correct answers A reaction that release energy is called an _____ reaction.

constant. correct answers The first law of thermodynamics states that the total energy of the
system and surroundings remains _____ .

coulomb correct answers Electrostatic interactions are governed by _____'s law.

aspartic acid ; glutamic acid. correct answers An ion pair with lysine can be formed by sidechain
of _____ or _____ .

infinite kcal/mol ; 0 kcal/mol. correct answers The energy for van der Waals interactions
approaches _____ as the distance between atom goes to zero and approaches _____ at infinite
distance.

zero. correct answers The force arising from a noncovalent interaction between two atoms is
always _____ at the energy minimum.

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