Question 1

For a reaction to be spontaneous,the change in the entropy of the universe must be

Accepted Answer

A)  greater than zero. 
B)  less than zero. 
C)  equal to zero. 
D)  equal to 1. 
A)  greater than zero. 
B)  less than zero. 
C)  equal to zero. 
D)  equal to 1.

Question 2

A molecule with hydrophobic and hydrophilic properties is best described as

Accepted Answer

A)  a zwitterion. 
B)  amphipathic. 
C)  polar. 
D)  nonpolar. 
A)  a zwitterion. 
B)  amphipathic. 
C)  polar. 
D)  nonpolar.

Question 3

What chemical reaction causes ATP to be a high-energy molecule?

Accepted Answer

A)  cleavage of phosphoanhydride bond 
B)  transfer of an adenylyl group to form a reactive intermediate 
C)  hydrolysis of phosphoryl group 
D)  oxidation of phosphoanhydride bond 
A)  cleavage of phosphoanhydride bond 
B)  transfer of an adenylyl group to form a reactive intermediate 
C)  hydrolysis of phosphoryl group 
D)  oxidation of phosphoanhydride bond

Question 4

What is the final molecule made from the oxidation of H2O by solar energy?

Accepted Answer

A)  ozone 
B)  glucose 
C)  fructose 
D)  carbon dioxide 
A)  ozone 
B)  glucose 
C)  fructose 
D)  carbon dioxide

Question 5

Energy conversion in living systems is required for what three types of work?

Accepted Answer

A)  osmotic work, chemical work, mechanical work 
B)  osmotic work, chemical work, potential work 
C)  kinetic work, chemical work, mechanical work 
D)  osmotic work, photosynthetic work, mechanical work 
A)  osmotic work, chemical work, mechanical work 
B)  osmotic work, chemical work, potential work 
C)  kinetic work, chemical work, mechanical work 
D)  osmotic work, photosynthetic work, mechanical work

Question 6

What chemical process is able to take place in the presence of solar energy?

Accepted Answer

A)  anaerobic respiration 
B)  photosynthesis 
C)  hydrogenation 
D)  hydrolysis 
A)  anaerobic respiration 
B)  photosynthesis 
C)  hydrogenation 
D)  hydrolysis

Question 7

Organisms on Earth cannot easily exist at temperatures below   because at that temperature

Accepted Answer

A)  hydrogen bonds cannot exist. 
B)  water does not exist in a tetrahedron. 
C)  ice crystals form in the organism. 
D)  proton hopping cannot occur. 
A)  hydrogen bonds cannot exist. 
B)  water does not exist in a tetrahedron. 
C)  ice crystals form in the organism. 
D)  proton hopping cannot occur.

Question 8

Under what conditions could a biological reaction spontaneously proceed to reactants if the   ?

Accepted Answer

A)  Reactant concentrations are greater than product concentrations. 
B)  Product concentrations are greater than reactant concentrations. 
C)  Reactant concentrations are equal to product concentrations. 
D)  There are no conditions where this could happen. 
A)  Reactant concentrations are greater than product concentrations. 
B)  Product concentrations are greater than reactant concentrations. 
C)  Reactant concentrations are equal to product concentrations. 
D)  There are no conditions where this could happen.

Question 9

Using the figure below,explain how having unsaturated fatty acid tails on phospholipids affects the fluidity of the membrane.

Accepted Answer

The kink in the tails that occ

Question 10

Fill in the table below.

Accepted Answer

The answer of Fill in the table below.  ...

Question 11

If the Gibbs free energy change value for a reaction is less than zero,this reaction is

Accepted Answer

A)  exergonic. 
B)  endergonic. 
C)  exothermic. 
D)  endothermic. 
A)  exergonic. 
B)  endergonic. 
C)  exothermic. 
D)  endothermic.

Question 12

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 13

The inclusion of cholesterol in a membrane can change the behavior of the membrane.Compare how the membrane behaves at low cholesterol concentration compared with high cholesterol concentration.

Accepted Answer

When small amounts of cholesterol are ad

Question 14

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

Accepted Answer

Phospholipid bilayers are characteristic

Question 15

Name and briefly describe the four types of weaker intermolecular forces found in biochemistry.

Accepted Answer

Hydrogen bonds: form between a hydrogen

Question 16

The combustion of gasoline is considered exothermic because heat is

Accepted Answer

A)  transferred from the surroundings to the system. 
B)  transferred from the system to the surroundings. 
C)  transferred to the universe. 
D)  not transferred. 
A)  transferred from the surroundings to the system. 
B)  transferred from the system to the surroundings. 
C)  transferred to the universe. 
D)  not transferred.

Question 17

Which of the following is an example of a system?

Accepted Answer

A)  the universe 
B)  the air 
C)  a test tube with reaction components 
D)  outer space 
A)  the universe 
B)  the air 
C)  a test tube with reaction components 
D)  outer space

Question 18

Explain why adding nonpolar compounds to water is energetically unfavorable.

Accepted Answer

The addition of nonpolar compounds to wa

Question 19

How are polar molecules like glucose transported across a membrane?

Accepted Answer

A)  There are holes in the membrane. 
B)  There are proteins that allow the transportation of polar molecules across the membrane. 
C)  Polar molecules cannot ever enter the cell. 
D)  Polar molecules diffuse across the hydrophobic barrier. 
A)  There are holes in the membrane. 
B)  There are proteins that allow the transportation of polar molecules across the membrane. 
C)  Polar molecules cannot ever enter the cell. 
D)  Polar molecules diffuse across the hydrophobic barrier.

Question 20

A solution of which of the following would be a good buffer system?

Accepted Answer

A)  HCl and NaOH 
B)  HCl and H2O 
C)  CH3COOH and NaCH3COO 
D)  NaOH and KOH 
A)  HCl and NaOH 
B)  HCl and H2O 
C)  CH3COOH and NaCH3COO 
D)  NaOH and KOH

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

For a reaction to be spontaneous,the change in the entropy of the universe must be

A molecule with hydrophobic and hydrophilic properties is best described as

What chemical reaction causes ATP to be a high-energy molecule?

What is the final molecule made from the oxidation of H2O by solar energy?

Energy conversion in living systems is required for what three types of work?

What chemical process is able to take place in the presence of solar energy?

Organisms on Earth cannot easily exist at temperatures below because at that temperature

Under what conditions could a biological reaction spontaneously proceed to reactants if the ?

Using the figure below,explain how having unsaturated fatty acid tails on phospholipids affects the fluidity of the membrane.

Fill in the table below.

If the Gibbs free energy change value for a reaction is less than zero,this reaction is

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

The inclusion of cholesterol in a membrane can change the behavior of the membrane.Compare how the membrane behaves at low cholesterol concentration compared with high cholesterol concentration.

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

Name and briefly describe the four types of weaker intermolecular forces found in biochemistry.

The combustion of gasoline is considered exothermic because heat is

Which of the following is an example of a system?

Explain why adding nonpolar compounds to water is energetically unfavorable.

How are polar molecules like glucose transported across a membrane?

A solution of which of the following would be a good buffer system?

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

What is the final molecule made from the oxidation of H₂O by solar energy?