Question 1

Describe the DNA helix proposed by Watson and Crick.

Accepted Answer

The DNA model proposed by Watson and Cri...

Question 2

Choose the correct answer from the list below. Not all of the answers will be used.
-The axis of a double helix can be twisted by a mechanism called _______________.

Accepted Answer

A)  supercoiling
B)  DNA
C)  5` → 3`
D)  circular
E)  stem loopF) B-DNAG) retrovirusesH) exonI) Erwin ChargaffJ) histonesK) RNAL) Rosalind FranklinM) A-DNAN) 3` → 5`

Question 3

What role does a nucleosome play in DNA structure?

Accepted Answer

A nucleosome consists of approximately 2...

Question 4

The process of rehybridizing melted DNA is called:

Accepted Answer

A)   denaturation.
B)   Tm.
C)   annealing.
D)   dehybridization.
E)   replication.

Question 5

Proteins that bind to DNA are rich the amino acids __________________ and __________________.

Accepted Answer

The answer of Proteins that bind to DNA are rich...

Question 6

How does a nucleotide differ from a nucleoside?

Accepted Answer

A)   Nucleosides are found in DNA, whereas nucleotides are found in RNA.
B)   Purines are only found in nucleotides.
C)   Nucleosides contain only deoxyribose sugars.
D)   A nucleotide is a nucleoside with a phosphate ester linked to the sugar .
E)   None of the above.

Question 7

The __________________ effect stabilizes the structure of DNA, resulting in more polar surfaces being exposed to the aqueous media.

Accepted Answer

The answer of The __________________ effect stabilizes the structure of...

Question 8

Draw two nucleotides in DNA, showing the linkage between the sugars.

Accepted Answer

The 3` oxygen of one nucleotide is linke...

Question 9

Why is there a major and a minor groove in DNA?

Accepted Answer

The major and minor grooves arise becaus...

Question 10

What are topoisomers of DNA?

Accepted Answer

Topoisomers, or topological isomers, are...

Question 11

The chemical forces that contribute to the stability of the DNA due to the base stacking present in the DNA helix are:

Accepted Answer

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

Question 12

Compare and contrast the three forms of DNA with respect to handedness and hydration state.

Accepted Answer

The Watson and Crick model of DNA is known as B-DNA and is a right-handed helix. A-DNA is also a right-handed helix, but is a less hydrated form. Z-DNA is a left-handed helix characterized by a zigzag arrangement of the backbone phosphoryl groups.

Question 13

Replication takes place in which manner?

Accepted Answer

A)   conservative
B)   random
C)   semiconservative
D)   N-linked
E)   None of the above.

Question 14

How many different sequence possibilities are there for a DNA polymer that is 10 bases long?

Accepted Answer

A)   262,13232
B)   320
C)   32,000
D)   1,048,576
E)   100,000

Question 15

The shorthand notation pApCpG denotes that:

Accepted Answer

A)   a phosphate is attached to the 5` of the adenosine nucleotide unit.
B)   a phosphate is attached to the 3` of the guanine nucleotide unit.
C)   the cytosine nucleotide has a free hydroxyl group.
D)   A and C.
E)   All of the above.

Question 16

Choose the correct answer from the list below. Not all of the answers will be used.
-The stable genetic information passed on from one generation to the next is _______________.

Accepted Answer

A)  supercoiling
B)  DNA
C)  5` → 3`
D)  circular
E)  stem loopF) B-DNAG) retrovirusesH) exonI) Erwin ChargaffJ) histonesK) RNAL) Rosalind FranklinM) A-DNAN) 3` → 5`

Question 17

A nitrogen containing an aromatic base attached to a ribose is a __________________.

Accepted Answer

The answer of A nitrogen containing an aromatic base attached...

Question 18

The form of DNA that is the narrowestbut having the longest pitch per turn of helix is the:

Accepted Answer

A)   A form
B)   B form
C)   C form
D)   Z form
E)   None of the above. D

Question 19

Briefly describe the Meselson and Stahl experiment that indicated that DNA replication is semiconservative

Accepted Answer

Meselson and Stahl grew bacteria in the presence of 15N, or "heavy" nitrogen. They rapidly replaced the 15N media with 14N, or "light" nitrogen. DNA was extracted at various intervals during the growth of the bacteria, representing different generations. Meselson and Stahl examined the DNA using density-gradient centrifugation and observed that no "heavy" DNA was present in the first generation, but that the DNA was intermediate between light and heavy. After the second generation, there were equal amounts of intermediate and light. This confirmed that one strand of the parent DNA is present in each daughter strand of replicated DNA.

Question 20

The difference in RNA bases compared to DNA bases is:

Accepted Answer

A)   RNA contains A instead of T.
B)   RNA contains U instead of G.
C)   RNA contains U instead of T.
D)   RNA contains A instead of U.
E)   None of the above.

Exam 33: The Structure of Informational Macromolecules: Dna and Rna

Describe the DNA helix proposed by Watson and Crick.

Correct Answer
verified
The DNA model proposed by Watson and Cri...
View Answer

Choose the correct answer from the list below. Not all of the answers will be used. -The axis of a double helix can be twisted by a mechanism called _______________.

Correct Answer
verified

What role does a nucleosome play in DNA structure?

Correct Answer
verified
A nucleosome consists of approximately 2...
View Answer

The process of rehybridizing melted DNA is called:

Correct Answer
verified

Proteins that bind to DNA are rich the amino acids and .

Correct Answer
verified

How does a nucleotide differ from a nucleoside?

Correct Answer
verified

The __________________ effect stabilizes the structure of DNA, resulting in more polar surfaces being exposed to the aqueous media.

Correct Answer
verified

Draw two nucleotides in DNA, showing the linkage between the sugars.

Correct Answer
verified
The 3` oxygen of one nucleotide is linke...
View Answer

Why is there a major and a minor groove in DNA?

Correct Answer
verified
The major and minor grooves arise becaus...
View Answer

What are topoisomers of DNA?

Correct Answer
verified
Topoisomers, or topological isomers, are...
View Answer

The chemical forces that contribute to the stability of the DNA due to the base stacking present in the DNA helix are:

Correct Answer
verified

Compare and contrast the three forms of DNA with respect to handedness and hydration state.

Correct Answer
verified
The Watson and Crick model of DNA is known as B-DNA and is a right-handed helix. A-DNA is also a right-handed helix, but is a less hydrated form. Z-DNA is a left-handed helix characterized by a zigzag arrangement of the backbone phosphoryl groups.

Replication takes place in which manner?

Correct Answer
verified

How many different sequence possibilities are there for a DNA polymer that is 10 bases long?

Correct Answer
verified

The shorthand notation pApCpG denotes that:

Correct Answer
verified

Choose the correct answer from the list below. Not all of the answers will be used. -The stable genetic information passed on from one generation to the next is _______________.

Correct Answer
verified

A nitrogen containing an aromatic base attached to a ribose is a __________________.

Correct Answer
verified

The form of DNA that is the narrowestbut having the longest pitch per turn of helix is the:

Correct Answer
verified
D

Briefly describe the Meselson and Stahl experiment that indicated that DNA replication is semiconservative

The difference in RNA bases compared to DNA bases is:

Correct Answer
verified

Exam 33: The Structure of Informational Macromolecules: Dna and Rna

Describe the DNA helix proposed by Watson and Crick.

Correct AnswerverifiedThe DNA model proposed by Watson and Cri...View AnswerShow Answer

Choose the correct answer from the list below. Not all of the answers will be used. -The axis of a double helix can be twisted by a mechanism called _______________.

Correct AnswerverifiedShow Answer

What role does a nucleosome play in DNA structure?

Correct AnswerverifiedA nucleosome consists of approximately 2...View AnswerShow Answer

The process of rehybridizing melted DNA is called:

Correct AnswerverifiedShow Answer

Proteins that bind to DNA are rich the amino acids __________________ and __________________.

Correct AnswerverifiedShow Answer

How does a nucleotide differ from a nucleoside?

Correct AnswerverifiedShow Answer

The __________________ effect stabilizes the structure of DNA, resulting in more polar surfaces being exposed to the aqueous media.

Correct AnswerverifiedShow Answer

Draw two nucleotides in DNA, showing the linkage between the sugars.

Correct AnswerverifiedThe 3` oxygen of one nucleotide is linke...View AnswerShow Answer

Why is there a major and a minor groove in DNA?

Correct AnswerverifiedThe major and minor grooves arise becaus...View AnswerShow Answer

What are topoisomers of DNA?

Correct AnswerverifiedTopoisomers, or topological isomers, are...View AnswerShow Answer

The chemical forces that contribute to the stability of the DNA due to the base stacking present in the DNA helix are:

Correct AnswerverifiedShow Answer

Compare and contrast the three forms of DNA with respect to handedness and hydration state.

Correct AnswerverifiedThe Watson and Crick model of DNA is known as B-DNA and is a right-handed helix. A-DNA is also a right-handed helix, but is a less hydrated form. Z-DNA is a left-handed helix characterized by a zigzag arrangement of the backbone phosphoryl groups.

Replication takes place in which manner?

Correct AnswerverifiedShow Answer

How many different sequence possibilities are there for a DNA polymer that is 10 bases long?

Correct AnswerverifiedShow Answer

The shorthand notation pApCpG denotes that:

Correct AnswerverifiedShow Answer

Choose the correct answer from the list below. Not all of the answers will be used. -The stable genetic information passed on from one generation to the next is _______________.

Correct AnswerverifiedShow Answer

A nitrogen containing an aromatic base attached to a ribose is a __________________.

Correct AnswerverifiedShow Answer

The form of DNA that is the narrowestbut having the longest pitch per turn of helix is the:

Correct AnswerverifiedD

Briefly describe the Meselson and Stahl experiment that indicated that DNA replication is semiconservative

The difference in RNA bases compared to DNA bases is:

Correct AnswerverifiedShow Answer

Correct Answer
verified
The DNA model proposed by Watson and Cri...
View Answer

Correct Answer
verified

Correct Answer
verified
A nucleosome consists of approximately 2...
View Answer

Correct Answer
verified

Proteins that bind to DNA are rich the amino acids and .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The 3` oxygen of one nucleotide is linke...
View Answer

Correct Answer
verified
The major and minor grooves arise becaus...
View Answer

Correct Answer
verified
Topoisomers, or topological isomers, are...
View Answer

Correct Answer
verified

Correct Answer
verified
The Watson and Crick model of DNA is known as B-DNA and is a right-handed helix. A-DNA is also a right-handed helix, but is a less hydrated form. Z-DNA is a left-handed helix characterized by a zigzag arrangement of the backbone phosphoryl groups.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified