Question 1

The transient force which, while weak, still has a large impact on how macromolecules interact is the ____________.

Accepted Answer

Van der Wa

Question 2

A solvent with a low dielectric constant would be a ____________ solvent for salts.

Accepted Answer

The answer of A solvent with a low dielectric constant...

Question 3

Hydrophobic molecules are driven together by ____________, not because they have an affinity for each other.

Accepted Answer

The answer of Hydrophobic molecules are driven together by ____________,...

Question 4

Choose the correct answer from the list below. Not all of the answers will be used.
-Movement of particles due to the random fluctuations of energy content of the environment is known as ____________.

Accepted Answer

A) ionic bonds or salt bridges 
B) Brownian motion 
C) hydrophobic 
D) hydrogen 
E) polar
F)nonpolar
G)van der Waals
H)entropy
I)zwitterion
J)amphipathic
K)positive
L)dielectric constant
M)negative 
A) ionic bonds or salt bridges 
B) Brownian motion 
C) hydrophobic 
D) hydrogen 
E) polar
F)nonpolar
G)van der Waals
H)entropy
I)zwitterion
J)amphipathic
K)positive
L)dielectric constant
M)negative

Question 5

Give examples of key functional groups found in biochemistry.

Accepted Answer

Hydrophobic, hydroxy

Question 6

Molecules that are readily soluble in water are considered ____________.

Accepted Answer

The answer of Molecules that are readily soluble in water...

Question 7

What charged group(s) are present in glycine at a pH of 7?

Accepted Answer

A)  -NH3+ 
B)  -COO- 
C)  -NH2+ 
D)  A and B 
E)  A, B, and C 
A)  -NH3+ 
B)  -COO- 
C)  -NH2+ 
D)  A and B 
E)  A, B, and C

Question 8

What happens to nonpolar molecules in water?

Accepted Answer

A)  They dissolve independently. 
B)  They aggregate together. 
C)  They precipitate. 
D)  All of the above. 
E)  None of the above. 
A)  They dissolve independently. 
B)  They aggregate together. 
C)  They precipitate. 
D)  All of the above. 
E)  None of the above.

Question 9

What thermodynamic and free-energy changes participate in protein folding?

Accepted Answer

A combination of hydrogen bond

Question 10

What is the [A−]/[HA] ratio when the weak acid is in a solution one pH unit above its pKa?

Accepted Answer

A)  1:1 
B)  1:10 
C)  10:1 
D)  2:1 
E)  None of the above. 
A)  1:1 
B)  1:10 
C)  10:1 
D)  2:1 
E)  None of the above.

Question 11

Water can form hydrogen bonds with the ___________ of another molecule.

Accepted Answer

A)  carbonyl groups 
B)  amine groups 
C)  aromatic rings 
D)  alcohol groups 
E)  A, B, and D 
A)  carbonyl groups 
B)  amine groups 
C)  aromatic rings 
D)  alcohol groups 
E)  A, B, and D

Question 12

What are the primary chemical components present in a phosphate buffer at pH 7.4?

Accepted Answer

A)  H3PO4 and PO4−3 
B)  H2PO4− and PO4−3 
C)  HPO4-2 and PO4-3 
D)  H2PO4− and HPO4−2 
E)  H3PO4 and HPO4−2 
A)  H3PO4 and PO4−3 
B)  H2PO4− and PO4−3 
C)  HPO4-2 and PO4-3 
D)  H2PO4− and HPO4−2 
E)  H3PO4 and HPO4−2

Question 13

What two properties of water are important for biological interactions?

Accepted Answer

A)  the polarity of water 
B)  the density of water 
C)  the cohesive properties of water 
D)  A and C 
E)  B and C 
A)  the polarity of water 
B)  the density of water 
C)  the cohesive properties of water 
D)  A and C 
E)  B and C

Question 14

Typical van der Waals energies are about:

Accepted Answer

A)  4-20 kJ/mol. 
B)  2-4 kJ/mol. 
C)  200 kJ/mol . 
D)  All of the above. 
E)  None of the above. 
A)  4-20 kJ/mol. 
B)  2-4 kJ/mol. 
C)  200 kJ/mol . 
D)  All of the above. 
E)  None of the above.

Question 15

Choose the correct answer from the list below. Not all of the answers will be used.
-____________: The type of bond found between an oxygen on one water molecule and hydrogen on a different water molecule.

Accepted Answer

A) ionic bonds or salt bridges 
B) Brownian motion 
C) hydrophobic 
D) hydrogen 
E) polar
F)nonpolar
G)van der Waals
H)entropy
I)zwitterion
J)amphipathic
K)positive
L)dielectric constant
M)negative 
A) ionic bonds or salt bridges 
B) Brownian motion 
C) hydrophobic 
D) hydrogen 
E) polar
F)nonpolar
G)van der Waals
H)entropy
I)zwitterion
J)amphipathic
K)positive
L)dielectric constant
M)negative

Question 16

What is the concentration of acetic acid in 250 ml of a 100 mM acetate buffer at pH 4.76?

Accepted Answer

A)  250 mM 
B)  100 mM 
C)  50 mM 
D)  75 mM 
E)  There is not enough information to tell. 
A)  250 mM 
B)  100 mM 
C)  50 mM 
D)  75 mM 
E)  There is not enough information to tell.

Question 17

Which of the following is considered a noncovalent bond?

Accepted Answer

A)  electrostatic interactions 
B)  hydrogen bonds 
C)  van der Waals interactions 
D)  All of the above. 
E)  None of the above. 
A)  electrostatic interactions 
B)  hydrogen bonds 
C)  van der Waals interactions 
D)  All of the above. 
E)  None of the above.

Question 18

Lipids that interact with both the water and the hydrophobic regions of the membrane are considered ____________.

Accepted Answer

The answer of Lipids that interact with both the water...

Question 19

Using Coulomb's law, describe how water is an ideal solvent for the ions found in cells?

Accepted Answer

The force which attracts two oppositely

Question 20

The force that is quantified by Coulomb's law is called the ____________.

Accepted Answer

ionic or e

Exam 2: Water, Weak Bonds, and the Generation of Order Out of Chaos

The transient force which, while weak, still has a large impact on how macromolecules interact is the ____________.

A solvent with a low dielectric constant would be a ____________ solvent for salts.

Hydrophobic molecules are driven together by ____________, not because they have an affinity for each other.

Choose the correct answer from the list below. Not all of the answers will be used. -Movement of particles due to the random fluctuations of energy content of the environment is known as ____________.

Give examples of key functional groups found in biochemistry.

Molecules that are readily soluble in water are considered ____________.

What charged group(s) are present in glycine at a pH of 7?

What happens to nonpolar molecules in water?

What thermodynamic and free-energy changes participate in protein folding?

What is the [A−]/[HA] ratio when the weak acid is in a solution one pH unit above its pKa?

Water can form hydrogen bonds with the ___________ of another molecule.

What are the primary chemical components present in a phosphate buffer at pH 7.4?

What two properties of water are important for biological interactions?

Typical van der Waals energies are about:

Choose the correct answer from the list below. Not all of the answers will be used. -____________: The type of bond found between an oxygen on one water molecule and hydrogen on a different water molecule.

What is the concentration of acetic acid in 250 ml of a 100 mM acetate buffer at pH 4.76?

Which of the following is considered a noncovalent bond?

Lipids that interact with both the water and the hydrophobic regions of the membrane are considered ____________.

Using Coulomb's law, describe how water is an ideal solvent for the ions found in cells?

The force that is quantified by Coulomb's law is called the ____________.

Biochemistry and the Unity of Life

Amino Acids

Protein Three-Dimensional Structure

Techniques in Protein Biochemistry

Basic Concepts of Enzyme Action

Kinetics and Regulation

Mechanisms and Inhibitors

Hemoglobin: an Allosteric Protein

Carbohydrates

Lipids

Membrane Structure and Function

Signal Transduction Pathways

Digestion: Turning a Meal Into Cellular Biochemicals

Metabolism: Basic Concepts and Design

Glycolysis

Gluconeogenesis

Preparation for the Cycle

Harvesting Electrons From the Cycle

The Electron Transport Chain

The Proton-Motive Force

The Light Reactions

The Calvin Cycle

Glycogen Degradation

Glycogen Synthesis

The Pentose Phosphate Pathway

Fatty Acid Degredation

Fatty Acid Synthesis

Lipid Synthesis

Amino Acid Degradation and the Urea Cycle

Amino Acids Synthesis

Nucleotide Metabolism

The Structure of Informational Macromolecules: Dna and Rna

DNA Replication

DNA Repair and Recombination

RNA Synthesis and Regulation in Prokaryotes

Gene Expression in Eukaryotes

RNA Processing in Eukaryotes

The Genetic Code

The Mechanism of Protein Synthesis

Recombinant DNA Techniques

Filters

What is the [A−]/[HA] ratio when the weak acid is in a solution one pH unit above its pK_a?