Question 1

How can a reaction that is endergonic occur in a biological system?

Accepted Answer

It must be paired wi

Question 2

As a protein folds,what are the stabilizing forces that help keep the protein folded?

Accepted Answer

A)  hydrophilic amino acids on the interior and hydrophobic amino acids on the exterior 
B)  increase in entropy in the surrounding water 
C)  favorable change in free energy 
D)  hydrophobic amino acids on the interior and hydrophilic amino acids on the exterior 
A)  hydrophilic amino acids on the interior and hydrophobic amino acids on the exterior 
B)  increase in entropy in the surrounding water 
C)  favorable change in free energy 
D)  hydrophobic amino acids on the interior and hydrophilic amino acids on the exterior

Question 3

The antifreeze proteins evolved independently through convergent evolution.What does that mean?

Accepted Answer

Convergent evolution is the independent

Question 4

If a reaction has a   and a  
,then __________ and the reaction is __________ at all temperatures.

Accepted Answer

A)    ; spontaneous 
B)    ; spontaneous 
C)    ; nonspontaneous 
D)    ; nonspontaneous 
A)    ; spontaneous 
B)    ; spontaneous 
C)    ; nonspontaneous 
D)    ; nonspontaneous

Question 5

What is the concentration of OH- in a solution that contains 3.9   10-4 M H+?

Accepted Answer

A)  2.6   10-11 M 
B)  3.9   10-4 
C)  2.7   10-2 M 
D)  1.0   10-14 M 
A)  2.6   10-11 M 
B)  3.9   10-4 
C)  2.7   10-2 M 
D)  1.0   10-14 M

Question 6

Hydrophobic interactions between nonpolar molecules result from the

Accepted Answer

A)  tendency to maximize water's interaction with nonpolar molecules. 
B)  strong attractions between nonpolar molecules. 
C)  water becoming more ordered around the nonpolar molecule. 
D)  water ionically bonding to the nonpolar molecule. 
A)  tendency to maximize water's interaction with nonpolar molecules. 
B)  strong attractions between nonpolar molecules. 
C)  water becoming more ordered around the nonpolar molecule. 
D)  water ionically bonding to the nonpolar molecule.

Question 7

Which of the following acids is the strongest given their Ka values?

Accepted Answer

A)  HF (3.5   10-4) 
B)  HClO2 (1.1   10-2) 
C)  HCN (4.9   10-10) 
D)  HNO2 (4.6   10-4) 
A)  HF (3.5   10-4) 
B)  HClO2 (1.1   10-2) 
C)  HCN (4.9   10-10) 
D)  HNO2 (4.6   10-4)

Question 8

The example of water freezing into ice shows

Accepted Answer

A)  an increase in entropy of the system. 
B)  a decrease in entropy of the system. 
C)  no change in the entropy of the system. 
D)  a decrease in the entropy of the surroundings. 
A)  an increase in entropy of the system. 
B)  a decrease in entropy of the system. 
C)  no change in the entropy of the system. 
D)  a decrease in the entropy of the surroundings.

Question 9

Which of the following best describes an open system?

Accepted Answer

A)  Matter and energy are freely exchanged with the surroundings. 
B)  Energy is exchanged with the surroundings but matter is not. 
C)  Matter is exchanged with the surroundings but energy is not. 
D)  Neither matter nor energy is exchanged with the surroundings. 
A)  Matter and energy are freely exchanged with the surroundings. 
B)  Energy is exchanged with the surroundings but matter is not. 
C)  Matter is exchanged with the surroundings but energy is not. 
D)  Neither matter nor energy is exchanged with the surroundings.

Question 10

The difference between an oxidation reaction and a reduction reaction is that oxidation is the __________ and reduction is the __________.

Accepted Answer

A)  loss of electrons; gain of electrons 
B)  gain of electrons; loss of electrons 
C)  loss of protons; gain of protons 
D)  gain of protons; loss of protons 
A)  loss of electrons; gain of electrons 
B)  gain of electrons; loss of electrons 
C)  loss of protons; gain of protons 
D)  gain of protons; loss of protons

Question 11

The standard free energy change is defined under what set of conditions?

Accepted Answer

A)  1 atm, 298 K, 1 M 
B)  1 atm, 273 K, 1 M 
C)  100 kPa, 273 K, 1 M 
D)  100 kPa, 298 K, 1 M 
A)  1 atm, 298 K, 1 M 
B)  1 atm, 273 K, 1 M 
C)  100 kPa, 273 K, 1 M 
D)  100 kPa, 298 K, 1 M

Question 12

The transfer of a phosphate from ATP to another molecule produces a(n)

Accepted Answer

A)  low-energy intermediate. 
B)  highly reactive intermediate. 
C)  neutral energy intermediate. 
D)  It is not possible to transfer a phosphate to another molecule. 
A)  low-energy intermediate. 
B)  highly reactive intermediate. 
C)  neutral energy intermediate. 
D)  It is not possible to transfer a phosphate to another molecule.

Question 13

Which of the following best defines the first law of thermodynamics?

Accepted Answer

A)  All spontaneous processes in the universe tend toward dispersal of energy. 
B)  Total amount of energy in the universe is a constant. 
C)  There is no entropy at zero Kelvin. 
D)  Entropy is a measure of disorder. 
A)  All spontaneous processes in the universe tend toward dispersal of energy. 
B)  Total amount of energy in the universe is a constant. 
C)  There is no entropy at zero Kelvin. 
D)  Entropy is a measure of disorder.

Question 14

Compare the reaction conditions for   and   
.

Accepted Answer

@#LAT-DLM&GS1U1P1$\circ$S1S1P0 is the standard free energy change and

Question 15

The interaction between an amino group and a carboxylate group is best characterized as

Accepted Answer

A)  hydrogen bonds. 
B)  ionic interactions. 
C)  van der Waals interactions. 
D)  a covalent bond. 
A)  hydrogen bonds. 
B)  ionic interactions. 
C)  van der Waals interactions. 
D)  a covalent bond.

Question 16

List the three chemical properties of ATP that account for the large standard free energy change that occurs when a phosphoanhydride bond is cleaved.

Accepted Answer

1.Electrostatic repulsion between the ch

Question 17

Weak acids have a high pKa because the

Accepted Answer

A)  HA concentration is high. 
B)  H+ concentration is high. 
C)  A-concentration is high. 
D)  HA concentration is low. 
A)  HA concentration is high. 
B)  H+ concentration is high. 
C)  A-concentration is high. 
D)  HA concentration is low.

Question 18

It is known that lipid molecules in a membrane are able to move throughout the membrane.Propose a method to determine which mode of motion is MOST likely to happen and justify your answer.

Accepted Answer

Fluorescence labeling of a phospholipid

Question 19

Justify the following sentence: The conversion of carbon dioxide and water into glucose and oxygen is a decrease of entropy.

Accepted Answer

The balanced chemical equation of 6 CO₂ (

Question 20

The characteristic(s)of a phospholipid is/are that they

Accepted Answer

A)  are overall nonpolar. 
B)  have a polar charged head group and nonpolar hydrocarbon tails. 
C)  have a nonpolar head group and polar hydrocarbon tails. 
D)  are overall polar. 
A)  are overall nonpolar. 
B)  have a polar charged head group and nonpolar hydrocarbon tails. 
C)  have a nonpolar head group and polar hydrocarbon tails. 
D)  are overall polar.

Exam 2: Physical Biochemistry: Energy Conversion,water,and Membranes

How can a reaction that is endergonic occur in a biological system?

As a protein folds,what are the stabilizing forces that help keep the protein folded?

The antifreeze proteins evolved independently through convergent evolution.What does that mean?

If a reaction has a and a ,then __________ and the reaction is __________ at all temperatures.

What is the concentration of OH- in a solution that contains 3.9 10-4 M H+?

Hydrophobic interactions between nonpolar molecules result from the

Which of the following acids is the strongest given their Ka values?

The example of water freezing into ice shows

Which of the following best describes an open system?

The difference between an oxidation reaction and a reduction reaction is that oxidation is the __________ and reduction is the __________.

The standard free energy change is defined under what set of conditions?

The transfer of a phosphate from ATP to another molecule produces a(n)

Which of the following best defines the first law of thermodynamics?

Compare the reaction conditions for and .

The interaction between an amino group and a carboxylate group is best characterized as

List the three chemical properties of ATP that account for the large standard free energy change that occurs when a phosphoanhydride bond is cleaved.

Weak acids have a high pKa because the

It is known that lipid molecules in a membrane are able to move throughout the membrane.Propose a method to determine which mode of motion is MOST likely to happen and justify your answer.

Justify the following sentence: The conversion of carbon dioxide and water into glucose and oxygen is a decrease of entropy.

The characteristic(s)of a phospholipid is/are that they

Principles of Biochemistry

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Enzyme Mechanisms

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Oxidative Phosphorylation

Photosynthesis

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Metabolic Integration

Dna Replication, repair, and Recombination

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

Filters

If a reaction has a and a ,then and the reaction is at all temperatures.

What is the concentration of OH^- in a solution that contains 3.9 10^-4 M H⁺?

The difference between an oxidation reaction and a reduction reaction is that oxidation is the and reduction is the .