Question 1

Draw the structure of uridine.

Accepted Answer

The answer of Draw the structure of uridine....

Question 2

Which of the following statements is not true about the structure of DNA as proposed by Watson and Crick?

Accepted Answer

A) The number of adenines in DNA is equal to the number of thymines. 
B) The number of cytosines is equal to the number of guanines. 
C) DNA consists of two strands of nucleic acids with the sugar-phosphate backbone on the inside and the bases on the outside. 
D) The chains in DNA are held together by hydrogen bonding. 
E) Adenine always pairs with thymine and guanine always pairs with cytosine. 
A) The number of adenines in DNA is equal to the number of thymines. 
B) The number of cytosines is equal to the number of guanines. 
C) DNA consists of two strands of nucleic acids with the sugar-phosphate backbone on the inside and the bases on the outside. 
D) The chains in DNA are held together by hydrogen bonding. 
E) Adenine always pairs with thymine and guanine always pairs with cytosine. C

Question 3

Which of the following is not true about retroviruses?

Accepted Answer

A) The genetic information is contained in RNA. 
B) The genetic information flows from DNA to RNA. 
C) Drugs have been designed to interfere with the synthesis of DNA by retroviruses. 
D) AZT is a design drug that was synthesized to combat the HIV retrovirus. 
E) The retrovirus uses the sequence of bases in RNA as a template to synthesize DNA which enters and infects the host cell. 
A) The genetic information is contained in RNA. 
B) The genetic information flows from DNA to RNA. 
C) Drugs have been designed to interfere with the synthesis of DNA by retroviruses. 
D) AZT is a design drug that was synthesized to combat the HIV retrovirus. 
E) The retrovirus uses the sequence of bases in RNA as a template to synthesize DNA which enters and infects the host cell. B

Question 4

What is the major structural difference between a ribonucleoside and a ribonucleotide?

Accepted Answer

A ribonucleotide is

Question 5

Which of the following is the first step in the mechanism of the reaction shown below?

Accepted Answer

A) Carboxylate ion attacks the thiol. 
B) Carboxylate ion attacks the α-phosphorus of ATP. 
C) Carboxylate ion attacks the γ-phosphorus of ATP. 
D) Thiol molecule attacks the β-phosphorus of ATP. 
E) Thiol molecule attacks the acyl group. 
A) Carboxylate ion attacks the thiol. 
B) Carboxylate ion attacks the α-phosphorus of ATP. 
C) Carboxylate ion attacks the γ-phosphorus of ATP. 
D) Thiol molecule attacks the β-phosphorus of ATP. 
E) Thiol molecule attacks the acyl group.

Question 6

Which of the following is true about tRNA?

Accepted Answer

A) All tRNA's have a CCG sequence at the 3'-end. 
B) All tRNA's have a CCG sequence at the 5'-end. 
C) All tRNA's have a CCA sequence at the 5'-end. 
D) All tRNA's have a CCA sequence at the 3'-end. 
E) All tRNA's have a CAC sequence at the 3'-end. 
A) All tRNA's have a CCG sequence at the 3'-end. 
B) All tRNA's have a CCG sequence at the 5'-end. 
C) All tRNA's have a CCA sequence at the 5'-end. 
D) All tRNA's have a CCA sequence at the 3'-end. 
E) All tRNA's have a CAC sequence at the 3'-end.

Question 7

What is a nucleotide? Give an example.

Accepted Answer

A nucleotide is a nucleoside with one of

Question 8

What is the sequence of bases in the strand of DNA that is complementary to that shown below? 5'-T-T-C-A-C-T-G-A-C-3'

Accepted Answer

A) 5'-T-T-C-A-C-T-G-A-C-3' 
B) 3'-T-T-C-A-C-T-G-A-C-5' 
C) 5'-A-A-G-T-G-A-C-T-G-3' 
D) 5'-G-T-C-A-G-T-G-A-A-3' 
E) 3'-U-U-C-A-C-U-G-A-C-5' 
A) 5'-T-T-C-A-C-T-G-A-C-3' 
B) 3'-T-T-C-A-C-T-G-A-C-5' 
C) 5'-A-A-G-T-G-A-C-T-G-3' 
D) 5'-G-T-C-A-G-T-G-A-A-3' 
E) 3'-U-U-C-A-C-U-G-A-C-5'

Question 9

All tRNAs have ________ at the 3'-end.

Accepted Answer

A) CCA 
B) UUC 
C) GCC 
D) CAG 
E) GGA 
A) CCA 
B) UUC 
C) GCC 
D) CAG 
E) GGA

Question 10

Which of the following statements concerning nucleic acids is not correct?

Accepted Answer

A) The enzymes that catalyze DNA synthesis are known as DNA polymerases. 
B) The growing DNA polymer is synthesized in the 5' to 3' direction. 
C) RNA strands are synthesized in the 3' to 5' direction. 
D) In DNA the distance between the strands of the double helix is relatively constant. 
E) Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose can act as the nucleophile that cleaves the strand. 
A) The enzymes that catalyze DNA synthesis are known as DNA polymerases. 
B) The growing DNA polymer is synthesized in the 5' to 3' direction. 
C) RNA strands are synthesized in the 3' to 5' direction. 
D) In DNA the distance between the strands of the double helix is relatively constant. 
E) Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose can act as the nucleophile that cleaves the strand.

Question 11

Draw the structure of thymidine.

Accepted Answer

The answer of Draw the structure of thymidine....

Question 12

What are Maxam-Gilbert and Sanger sequencing?

Accepted Answer

They are methods use

Question 13

Identify the nucleoside shown below.

Accepted Answer

The answer of Identify the nucleoside shown below.  ...

Question 14

Show that you understand how the structural components of DNA are bonded together by drawing a linear segment that contains 3 base residues.

Accepted Answer

Other choices for th

Question 15

Identify the sugar and the base in the structure below.

Accepted Answer

b-D-ribofu

Question 16

Which of the following statements explains what nucleic acids are?

Accepted Answer

A) They are acidic in nature. 
B) They are the carriers of genetic information. 
C) DNA and RNA are collectively known as nucleic acids. 
D) Nucleic acids are chains of five-membered ring sugars, each bonded to a heterocyclic amine, linked by phosphate groups. 
E) all of the above 
A) They are acidic in nature. 
B) They are the carriers of genetic information. 
C) DNA and RNA are collectively known as nucleic acids. 
D) Nucleic acids are chains of five-membered ring sugars, each bonded to a heterocyclic amine, linked by phosphate groups. 
E) all of the above

Question 17

What is meant by semiconservative DNA replication?

Accepted Answer

When DNA strands are replicated, two dau

Question 18

Which of the following is the conventional method of writing the base sequence of a portion of a DNA chain?

Accepted Answer

A) 5'-end--bases--5'-end 
B) 5'-end--bases--3'-end 
C) 3'-end--bases--5'-end 
D) 3'-end--bases--3'-end 
E) 5'-end--bases--2'-end 
A) 5'-end--bases--5'-end 
B) 5'-end--bases--3'-end 
C) 3'-end--bases--5'-end 
D) 3'-end--bases--3'-end 
E) 5'-end--bases--2'-end

Question 19

Draw the structure of UDP.

Accepted Answer

The answer of Draw the structure of UDP....

Question 20

What are the four common ribonucleosides?

Accepted Answer

cytidine,

Exam 26: Nucleosides, Nucleotides, and Nucleic Acids

Draw the structure of uridine.

Which of the following statements is not true about the structure of DNA as proposed by Watson and Crick?

Which of the following is not true about retroviruses?

What is the major structural difference between a ribonucleoside and a ribonucleotide?

Which of the following is the first step in the mechanism of the reaction shown below?

Which of the following is true about tRNA?

What is a nucleotide? Give an example.

What is the sequence of bases in the strand of DNA that is complementary to that shown below? 5'-T-T-C-A-C-T-G-A-C-3'

All tRNAs have ________ at the 3'-end.

Which of the following statements concerning nucleic acids is not correct?

Draw the structure of thymidine.

What are Maxam-Gilbert and Sanger sequencing?

Identify the nucleoside shown below.

Show that you understand how the structural components of DNA are bonded together by drawing a linear segment that contains 3 base residues.

Identify the sugar and the base in the structure below.

Which of the following statements explains what nucleic acids are?

What is meant by semiconservative DNA replication?

Which of the following is the conventional method of writing the base sequence of a portion of a DNA chain?

Draw the structure of UDP.

What are the four common ribonucleosides?

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Synthetic Polymers

Pericyclic Reactions

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