Question 1

How do plants, fungi, and bacteria avoid the damaging effects of a hypotonic environment?

Accepted Answer

A)  flexible cells walls 
B)  rigid cells walls 
C)  semipermeable cell walls 
D)  photosynthesis 
A)  flexible cells walls 
B)  rigid cells walls 
C)  semipermeable cell walls 
D)  photosynthesis

Question 2

Compare a catabolic pathway versus an anabolic pathway.

Accepted Answer

Anabolic pathways synthesize b

Question 3

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 4

If the equilibrium constant (Keq) is greater than 1, what is the value of $\Delta$G $\degree$?

Accepted Answer

A)  "$\Delta$G $\degree$ $\gt$ 0" 
B)  "$\Delta$G $\degree$ = 0" 
C)  "$\Delta$G $\degree$   $\lt$ 0" 
D)  "$\Delta$G $\degree$ $\gt$ 1" 
A)  "$\Delta$G $\degree$ $\gt$ 0" 
B)  "$\Delta$G $\degree$ = 0" 
C)  "$\Delta$G $\degree$   $\lt$ 0" 
D)  "$\Delta$G $\degree$ $\gt$ 1"

Question 5

What is the expected osmotic pressure around the cells for the plant with low turgor pressure shown below?

Accepted Answer

A)  hypotonic 
B)  hypertonic 
C)  isotonic 
D)  equilibrium 
A)  hypotonic 
B)  hypertonic 
C)  isotonic 
D)  equilibrium

Question 6

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 7

A hot pack on your arm is an example of what kind of system?

Accepted Answer

A)  open 
B)  closed 
C)  isolated 
D)  surroundings 
A)  open 
B)  closed 
C)  isolated 
D)  surroundings

Question 8

Which of the following is the Kw value for pure water at 25 $\degree$C?

Accepted Answer

A)  1 *1014  
B)  1 *10-14  
C)  7 
D)  14 
A)  1 *1014  
B)  1 *10-14  
C)  7 
D)  14

Question 9

Freezing point depression, boiling point elevation, and osmotic pressure are all what kind of properties?

Accepted Answer

A)  intrinsic properties 
B)  colligative properties 
C)  state functions 
D)  hydrophobic effects 
A)  intrinsic properties 
B)  colligative properties 
C)  state functions 
D)  hydrophobic effects

Question 10

Compare the structure of a phospholipid bilayer and the structure of a micelle.

Accepted Answer

Phospholipid bilayers are characteristic

Question 11

Explain why a negative $\Delta$G does not necessarily mean it will be a rapid reaction.

Accepted Answer

@#LAT-DLM&G tells you whether a reaction is likely

Question 12

In a hydrogen bond between a water molecule and another water molecule,

Accepted Answer

A)  a hydrogen ion on the water molecule forms an ionic bond with the oxygen ion on the other water. 
B)  the hydrogen bond typically forms between the oxygen atom of the water and the hydrogen on the other water. 
C)  a hydrogen on the water molecule forms a covalent bond to a hydrogen atom on the other water. 
D)  the hydrogen atom forms an ionic bond with a carbon on the other water. 
A)  a hydrogen ion on the water molecule forms an ionic bond with the oxygen ion on the other water. 
B)  the hydrogen bond typically forms between the oxygen atom of the water and the hydrogen on the other water. 
C)  a hydrogen on the water molecule forms a covalent bond to a hydrogen atom on the other water. 
D)  the hydrogen atom forms an ionic bond with a carbon on the other water.

Question 13

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 14

Which of the following are true about buffers?

Accepted Answer

A)  An effective buffer is made from a strong acid and strong base. 
B)  A buffer is most resistant to changes in pH when [HA] = [A-]. 
C)  A buffer is only resistant to changes in pH when acid is added. 
D)  The pH range of a buffering system is 0 to 14. 
A)  An effective buffer is made from a strong acid and strong base. 
B)  A buffer is most resistant to changes in pH when [HA] = [A-]. 
C)  A buffer is only resistant to changes in pH when acid is added. 
D)  The pH range of a buffering system is 0 to 14.

Question 15

If $\Delta$G= 0 for a reaction, then this reaction

Accepted Answer

A)  is favorable in the forward direction. 
B)  is favorable in the reverse direction. 
C)  is at equilibrium. 
D)  cannot occur. 
A)  is favorable in the forward direction. 
B)  is favorable in the reverse direction. 
C)  is at equilibrium. 
D)  cannot occur.

Question 16

Explain why adding nonpolar compounds to water is energetically unfavorable.

Accepted Answer

The addition of nonpolar compounds to wa

Question 17

The lateral mobility of lipids with membrane depends on temperature as well as other factors. What would be expected to happen to the lateral mobility if the temperature was decreased?

Accepted Answer

A)  Mobility would be unaffected. 
B)  Mobility would increase. 
C)  Mobility would decrease. 
D)  The membrane would decompose. 
A)  Mobility would be unaffected. 
B)  Mobility would increase. 
C)  Mobility would decrease. 
D)  The membrane would decompose.

Question 18

Water is a simple molecule that has three distinct properties. What are these properties and how are they critical for life processes?

Accepted Answer

Water is less dense as a solid than a li

Question 19

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.

Question 20

Given 80 grams of water, how many calories are required to raise the temperature 1 $\degree$C?

Accepted Answer

A)  4.184 calories 
B)  15.7 calories 
C)  80 calories 
D)  Not enough information is given to calculate the answer. 
A)  4.184 calories 
B)  15.7 calories 
C)  80 calories 
D)  Not enough information is given to calculate the answer.

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

How do plants, fungi, and bacteria avoid the damaging effects of a hypotonic environment?

Compare a catabolic pathway versus an anabolic pathway.

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

If the equilibrium constant (Keq) is greater than 1, what is the value of Δ\DeltaΔ G °\degree° ?

What is the expected osmotic pressure around the cells for the plant with low turgor pressure shown below?

Weak acids have a high pKa because the

A hot pack on your arm is an example of what kind of system?

Which of the following is the Kw value for pure water at 25 °\degree° C?

Freezing point depression, boiling point elevation, and osmotic pressure are all what kind of properties?

Compare the structure of a phospholipid bilayer and the structure of a micelle.

Explain why a negative Δ\DeltaΔ G does not necessarily mean it will be a rapid reaction.

In a hydrogen bond between a water molecule and another water molecule,

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

Which of the following are true about buffers?

If Δ\DeltaΔ G= 0 for a reaction, then this reaction

Explain why adding nonpolar compounds to water is energetically unfavorable.

The lateral mobility of lipids with membrane depends on temperature as well as other factors. What would be expected to happen to the lateral mobility if the temperature was decreased?

Water is a simple molecule that has three distinct properties. What are these properties and how are they critical for life processes?

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

Given 80 grams of water, how many calories are required to raise the temperature 1 °\degree° C?

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 the equilibrium constant (K_eq) is greater than 1, what is the value of $\Delta$ G $\degree$ ?

Which of the following is the K_w value for pure water at 25 $\degree$ C?

Explain why a negative $\Delta$ G does not necessarily mean it will be a rapid reaction.

If $\Delta$ G= 0 for a reaction, then this reaction

Given 80 grams of water, how many calories are required to raise the temperature 1 $\degree$ C?