Question 1

In the DNA double helix,two strands of nucleic acids are held together by _____________.

Accepted Answer

hydrogen bonds

Question 2

Concerning the genetic code,which of the following is an incorrect statement?

Accepted Answer

A)  Not all codons specify amino acids. 
B)  There are a total of 64 different triplets. 
C)  For each amino acid there are the same number of codons. 
D)  The triplet codons are incorporated in messenger RNA. 
E)  The triplet AUG is a "start" codon. 
A)  Not all codons specify amino acids. 
B)  There are a total of 64 different triplets. 
C)  For each amino acid there are the same number of codons. 
D)  The triplet codons are incorporated in messenger RNA. 
E)  The triplet AUG is a "start" codon. C

Question 3

Draw structures to represent the bonding between deoxyribose and thymine.

Accepted Answer

The answer of Draw structures to represent the bonding between...

Question 4

The primary function of nucleic acids is:

Accepted Answer

A)  the catalysis of biochemical reactions. 
B)  the regulation of reactions that occur in the body. 
C)  the preservation,transcription and translation of information. 
D)  the acid-catalyzed hydrolysis of nucleotides. 
E)  the neutralization of nucleic bases. 
A)  the catalysis of biochemical reactions. 
B)  the regulation of reactions that occur in the body. 
C)  the preservation,transcription and translation of information. 
D)  the acid-catalyzed hydrolysis of nucleotides. 
E)  the neutralization of nucleic bases.

Question 5

Nitrous acid is a suspected mutagen because of its reaction with:

Accepted Answer

A)  amine groups. 
B)  monosaccharides. 
C)  phosphates. 
D)  alcohols. 
E)  ketones. 
A)  amine groups. 
B)  monosaccharides. 
C)  phosphates. 
D)  alcohols. 
E)  ketones.

Question 6

Specific amino acids attach to the arm of a tRNA that ends in __________,via a(n)_________ bond.

Accepted Answer

A)  CCG,ester 
B)  ACG,ether 
C)  CCA,glycosidic 
D)  ACA,amide 
E)  CCA,ester 
A)  CCG,ester 
B)  ACG,ether 
C)  CCA,glycosidic 
D)  ACA,amide 
E)  CCA,ester

Question 7

The secondary structure of DNA was proposed by Watson and Crick to be a ___________________.

Accepted Answer

The answer of The secondary structure of DNA was proposed...

Question 8

In the DNA base pairs,adenine always bonds with _________ and cytosine with __________.

Accepted Answer

The answer of In the DNA base pairs,adenine always bonds...

Question 9

The four bases that make up the DNA "ladder" are: ____________.

Accepted Answer

adenine,cy

Question 10

What product is likely to be formed from the reaction between an adenine residue on a nucleotide and nitrous acid? Explain the possible involvement of the product of this reaction in causing spontaneous mutation during replication.

Accepted Answer

The product resembles a guanine nucleoti

Question 11

Which heterocyclic base found in RNA does not occur in DNA?

Accepted Answer

A)  Guanine 
B)  Thymine 
C)  Cytosine 
D)  Uracil 
E)  Adenine 
A)  Guanine 
B)  Thymine 
C)  Cytosine 
D)  Uracil 
E)  Adenine

Question 12

The four bases found in RNA are: _________.

Accepted Answer

adenine,cy

Question 13

The synthesis of adenosine by the reaction shown below likely occurs by what reaction mechanism?

Accepted Answer

A)  An SN2 reaction 
B)  An SNAr reaction 
C)  An elimination-addition reaction 
D)  An SN1 reaction 
E)  An E2 reaction 
A)  An SN2 reaction 
B)  An SNAr reaction 
C)  An elimination-addition reaction 
D)  An SN1 reaction 
E)  An E2 reaction

Question 14

If a tRNA anticodon is GUC,what was the original base sequence in DNA?

Accepted Answer

A)  GUC 
B)  GTC 
C)  CAG 
D)  GAC 
E)  CTG 
A)  GUC 
B)  GTC 
C)  CAG 
D)  GAC 
E)  CTG

Question 15

If the base sequence along a segment of DNA were G-C-C-A-T,what would be the base sequence of messenger RNA synthesized from this sequence?

Accepted Answer

A)  C-U-U-T-A 
B)  C-G-G-T-A 
C)  C-G-G-U-A 
D)  G-C-C-A-U 
E)  A-T-T-G-C 
A)  C-U-U-T-A 
B)  C-G-G-T-A 
C)  C-G-G-U-A 
D)  G-C-C-A-U 
E)  A-T-T-G-C

Question 16

The synthesis of proteins according to "the central dogma of molecular genetics" would require:

Accepted Answer

A)  replication then translation. 
B)  translation then replication. 
C)  replication then transcription. 
D)  transcription then translation. 
E)  Any of these 
A)  replication then translation. 
B)  translation then replication. 
C)  replication then transcription. 
D)  transcription then translation. 
E)  Any of these

Question 17

What anticodon sequences of tRNA's are coded for by the mRNA sequence CUU-AUG-GCU-UGG-CCC-UAA?

Accepted Answer

mRNA CUU-AUG-GCU-UGG

Question 18

2'-Deoxythymine exist in the lactam form rather than in the tautomeric lactim form.Explain.

Accepted Answer

@#IMG-DLM& The lacta

Question 19

Amino acids bear the same relation to proteins as __________ do to nucleic acids.

Accepted Answer

The answer of Amino acids bear the same relation to...

Question 20

Supply the missing reagent(s)in the synthesis below.

Accepted Answer

A)  PO4-3 and C6H5CH2OH 
B)  PO4-3 and C6H5CH2Cl 
C) 
  
D)  C6H5CH3 + POCl3 
E)  C6H5CH2OH + H3PO4 
A)  PO4-3 and C6H5CH2OH 
B)  PO4-3 and C6H5CH2Cl 
C) 
  
D)  C6H5CH3 + POCl3 
E)  C6H5CH2OH + H3PO4

Exam 25: Nucleic Acids and Protein Synthesis

In the DNA double helix,two strands of nucleic acids are held together by _____________.

Concerning the genetic code,which of the following is an incorrect statement?

Draw structures to represent the bonding between deoxyribose and thymine.

The primary function of nucleic acids is:

Nitrous acid is a suspected mutagen because of its reaction with:

Specific amino acids attach to the arm of a tRNA that ends in __________,via a(n)_________ bond.

The secondary structure of DNA was proposed by Watson and Crick to be a ___________________.

In the DNA base pairs,adenine always bonds with _________ and cytosine with __________.

The four bases that make up the DNA "ladder" are: ____________.

What product is likely to be formed from the reaction between an adenine residue on a nucleotide and nitrous acid? Explain the possible involvement of the product of this reaction in causing spontaneous mutation during replication.

Which heterocyclic base found in RNA does not occur in DNA?

The four bases found in RNA are: _________.

The synthesis of adenosine by the reaction shown below likely occurs by what reaction mechanism?

If a tRNA anticodon is GUC,what was the original base sequence in DNA?

If the base sequence along a segment of DNA were G-C-C-A-T,what would be the base sequence of messenger RNA synthesized from this sequence?

The synthesis of proteins according to "the central dogma of molecular genetics" would require:

What anticodon sequences of tRNA's are coded for by the mRNA sequence CUU-AUG-GCU-UGG-CCC-UAA?

2'-Deoxythymine exist in the lactam form rather than in the tautomeric lactim form.Explain.

Amino acids bear the same relation to proteins as __________ do to nucleic acids.

Supply the missing reagent(s)in the synthesis below.

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Filters

Specific amino acids attach to the arm of a tRNA that ends in __,via a(n)_ bond.

In the DNA base pairs,adenine always bonds with _ and cytosine with __.