Question 1

Which of the following atoms commonly found in biological molecules are often hydrogen-bond acceptors?

Accepted Answer

A)  carbon 
B)  oxygen 
C)  nitrogen 
D)  All of the answers are correct. 
E)  oxygen and nitrogen

Question 2

What happens to nonpolar molecules in water?

Accepted Answer

A)  They dissolve independently. 
B)  They aggregate together. 
C)  They precipitate. 
D)  All of the answers are correct. 
E)  None of the answers is correct.

Question 3

What is the net effect of many van der Waals interactions?

Accepted Answer

The answer of What is the net effect of many...

Question 4

Provide a simple example of a process in which the entropy of a system changes.

Accepted Answer

The answer of Provide a simple example of a process...

Question 5

Why does DNA denature when the pH is raised above 9?

Accepted Answer

A) 	Protons dissociate from guanine bases disrupting the hydrogen bonding to the other strand. 
B) 	Protons bind to guanine residues giving them additional positive charges which disrupt the hydrogen bonding to the other strand. 
C) 	Protons bind to functional groups that serve as hydrogen-bond acceptors, thus disrupting the hydrogen bonding to the other strand. 
D) 	Protons dissociate from the phosphate groups in the backbone, which disrupts the hydrogen-bonding pattern between strands. 
E) 	None of the answers is correct.

Question 6

If most proteins are found surrounded by water in the cell, what type of functional groups would you expect to find on the surface of a water-soluble protein?

Accepted Answer

The answer of If most proteins are found surrounded by...

Question 7

How can a cell exist if the Second Law of Thermodynamics is true?

Accepted Answer

The answer of How can a cell exist if the...

Question 8

When solutions containing complementary single strands of DNA are mixed, a loss of entropy occurs. How is it that the Second Law of Thermodynamics is not violated?

Accepted Answer

The answer of When solutions containing complementary single strands of...

Question 9

What are some of the medical implications of the human genome project?

Accepted Answer

The answer of What are some of the medical implications...

Question 10

Approximately what percentage of the human genome encodes proteins?

Accepted Answer

A)  50% 
B)  90% 
C)  20% 
D)  3% 
E)  None of the answers is correct.

Question 11

The Second Law of Thermodynamics states

Accepted Answer

A)  the total entropy of a system and its surroundings always increases for a spontaneous process. 
B)  temperatures will always decrease in a spontaneous process. 
C)  the total energy of a system and its surroundings is constant. 
D)  diversity is the result of gradual evolution. 
E)  None of the answers is correct.

Question 12

The fundamental groups of organisms include Eukarya, Bacteria, and _____.

Accepted Answer

A)  Plantae 
B)  Animalia 
C)  Protista 
D)  Archaea 
E)  Fungi

Question 13

DNA is made from the building blocks adenine, guanine, cytosine and _____.

Accepted Answer

A)  uridine 
B)  thymine 
C)  inosine 
D)  ribose 
E)  None of the answers is correct.

Question 14

Describe resonance structures.

Accepted Answer

The answer of Describe resonance structures....

Question 15

If a particular reaction has a negative $\Delta$G, is it likely to occur?

Accepted Answer

A)  Not unless energy is added to the system 
B)  Yes, if it is coupled to another reaction 
C)  Yes, it is spontaneous. 
D)  No, it is not spontaneous. 
E)  Yes, as long as the temperature increases

Question 16

What is the significance of using $\Delta$G in biochemistry?

Accepted Answer

The answer of What is the significance of using $\Delta$G...

Question 17

The First Law of Thermodynamics states

Accepted Answer

A)  diversity is the result of gradual evolution. 
B)  the total entropy of a system and its surroundings always increases for a spontaneous process. 
C)  the total energy of a system and its surroundings is constant. 
D)  light is both particle and wave. 
E)  None of the answers is correct.

Question 18

What did Watson and Crick suggest to be significant about the base pairing found in the helix?

Accepted Answer

A)  It allowed the DNA to twist in a helix. 
B)  The DNA could be circular. 
C)  It was a mechanism for copying. 
D)  All of the answers are correct. 
E)  None of the answers is correct.

Question 19

Which is the correct order of decreasing bond strengths?

Accepted Answer

A)  hydrogen bonds, covalent bonds, van der Waals interactions 
B)  hydrogen bonds, electrostatic interactions, covalent bonds 
C)  van der Waals interactions, covalent bonds, hydrogen bonds 
D)  covalent bonds, hydrogen bonds, van der Waals interactions 
E)  hydrophobic interactions, hydrogen bonds, electrostatic interactions

Question 20

The structure of DNA described by Watson and Crick included

Accepted Answer

A)  a double helix. 
B)  the sugar phosphate backbone aligned in the center of the helix. 
C)  the base pairs that are stacked on the inside of the double helix. 
D)  both a double helix and the sugar phosphate backbone aligned in the center of the helix 
E)  a double helix and the base pairs that are stacked on the inside of the double helix

Exam 1: Biochemistry: an Evolving Science

Which of the following atoms commonly found in biological molecules are often hydrogen-bond acceptors?

What happens to nonpolar molecules in water?

What is the net effect of many van der Waals interactions?

Provide a simple example of a process in which the entropy of a system changes.

Why does DNA denature when the pH is raised above 9?

If most proteins are found surrounded by water in the cell, what type of functional groups would you expect to find on the surface of a water-soluble protein?

How can a cell exist if the Second Law of Thermodynamics is true?

When solutions containing complementary single strands of DNA are mixed, a loss of entropy occurs. How is it that the Second Law of Thermodynamics is not violated?

What are some of the medical implications of the human genome project?

Approximately what percentage of the human genome encodes proteins?

The Second Law of Thermodynamics states

The fundamental groups of organisms include Eukarya, Bacteria, and _____.

DNA is made from the building blocks adenine, guanine, cytosine and _____.

Describe resonance structures.

If a particular reaction has a negative $\Delta$ G, is it likely to occur?

What is the significance of using $\Delta$ G in biochemistry?

The First Law of Thermodynamics states

What did Watson and Crick suggest to be significant about the base pairing found in the helix?

Which is the correct order of decreasing bond strengths?

The structure of DNA described by Watson and Crick included

Exam 1: Biochemistry: an Evolving Science

Which of the following atoms commonly found in biological molecules are often hydrogen-bond acceptors?

What happens to nonpolar molecules in water?

What is the net effect of many van der Waals interactions?

Provide a simple example of a process in which the entropy of a system changes.

Why does DNA denature when the pH is raised above 9?

If most proteins are found surrounded by water in the cell, what type of functional groups would you expect to find on the surface of a water-soluble protein?

How can a cell exist if the Second Law of Thermodynamics is true?

When solutions containing complementary single strands of DNA are mixed, a loss of entropy occurs. How is it that the Second Law of Thermodynamics is not violated?

What are some of the medical implications of the human genome project?

Approximately what percentage of the human genome encodes proteins?

The Second Law of Thermodynamics states

The fundamental groups of organisms include Eukarya, Bacteria, and _____.

DNA is made from the building blocks adenine, guanine, cytosine and _____.

Describe resonance structures.

If a particular reaction has a negative Δ\DeltaΔ G, is it likely to occur?

What is the significance of using Δ\DeltaΔ G in biochemistry?

The First Law of Thermodynamics states

What did Watson and Crick suggest to be significant about the base pairing found in the helix?

Which is the correct order of decreasing bond strengths?

The structure of DNA described by Watson and Crick included

If a particular reaction has a negative $\Delta$ G, is it likely to occur?

What is the significance of using $\Delta$ G in biochemistry?