Question 1

Why does the polymerase enzyme used in the PCR not denature at high temperature?

Accepted Answer

Because extremozymes are used.

Question 2

For the following statements,answer yes or no.
a)Is the genetic code embodied in DNA? Yes/No
b)Does a sequence of three bases in a DNA polymer code for two amino acids that are used in protein synthesis? Yes/No
c)Is the genetic code transcribed to mRNA? Yes/No
d)Are amino acids carried to the protein building site by mRNA? Yes/No

Accepted Answer

a)Yes; 
b)No (a sequence of th

Question 3

Which is the messenger codon which calls for the initiation of protein synthesis?

Accepted Answer

A) AUG 
B) GUA 
C) UAG 
D) AUC 
E) CAC 
A) AUG 
B) GUA 
C) UAG 
D) AUC 
E) CAC

Question 4

Which of the following is not a pyrimidine?

Accepted Answer

A) Cytosine 
B) Thymine 
C) Guanine 
D) Uracil 
E) All of these choices are pyrimidines. 
A) Cytosine 
B) Thymine 
C) Guanine 
D) Uracil 
E) All of these choices are pyrimidines.

Question 5

What are the names of the nucleosides found in DNA?

Accepted Answer

A) 2'-Deoxyadenosine,uridine,thymine,2'-deoxyguanosine, 
B) 2'-Deoxyadenosine,2'-deoxythymidine,2'-deoxyguanosine,2'-deoxycytidine 
C) 2'-Deoxyadenoside,2'-deoxythymidine,2'-deoxyguanoside,2'-deoxycytidine 
D) Adenosine,uridine,guanosine,cytidine 
E) 2'-Deoxyadenoside,thymidine,2'-deoxyguanoside,2'-deoxycytidine 
A) 2'-Deoxyadenosine,uridine,thymine,2'-deoxyguanosine, 
B) 2'-Deoxyadenosine,2'-deoxythymidine,2'-deoxyguanosine,2'-deoxycytidine 
C) 2'-Deoxyadenoside,2'-deoxythymidine,2'-deoxyguanoside,2'-deoxycytidine 
D) Adenosine,uridine,guanosine,cytidine 
E) 2'-Deoxyadenoside,thymidine,2'-deoxyguanoside,2'-deoxycytidine

Question 6

Complete hydrolysis of adenylic acid would yield which of these?

Accepted Answer

A) Adenosine and a phosphate ion 
B) Adenine,d-ribose,and a phosphate ion 
C) Adenine and d-ribose 
D) Adenine and 2-deoxy-d-ribose 
E) A pyrimidine,a pentose,and a phosphate ion 
A) Adenosine and a phosphate ion 
B) Adenine,d-ribose,and a phosphate ion 
C) Adenine and d-ribose 
D) Adenine and 2-deoxy-d-ribose 
E) A pyrimidine,a pentose,and a phosphate ion

Question 7

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 8

Where is the sequence of bases termed an "anticodon" found?

Accepted Answer

A) mRNA 
B) tRNA 
C) rRNA 
D) DNA 
E) Polysomes 
A) mRNA 
B) tRNA 
C) rRNA 
D) DNA 
E) Polysomes

Question 9

The anticodon is part of

Accepted Answer

A) mRNA 
B) tRNA 
C) rRNA 
D) DNA 
E) None of these choices. 
A) mRNA 
B) tRNA 
C) rRNA 
D) DNA 
E) None of these choices.

Question 10

The following structure represents the less common (in DNA,at least)tautomeric form of ___.

Accepted Answer

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

Question 11

What are the introns?

Accepted Answer

They are segments that are tra

Question 12

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 13

In DNA,the lactim form of guanine will pair with which base?

Accepted Answer

A) Cytosine 
B) Adenine 
C) Uracil 
D) Thymine 
E) No pairing is possible. 
A) Cytosine 
B) Adenine 
C) Uracil 
D) Thymine 
E) No pairing is possible.

Question 14

An RNA nucleoside will undergo hydrolysis in dilute acid to yield which of the following?

Accepted Answer

A) 2-Deoxy-d-ribose and a heterocyclic base 
B) 2-Deoxy-d-ribose,a heterocyclic base,and phosphate ion 
C) d-Ribose and a heterocyclic base 
D) d-Ribose,a heterocyclic base,and phosphate ion 
E) d-Ribose and phosphate ion 
A) 2-Deoxy-d-ribose and a heterocyclic base 
B) 2-Deoxy-d-ribose,a heterocyclic base,and phosphate ion 
C) d-Ribose and a heterocyclic base 
D) d-Ribose,a heterocyclic base,and phosphate ion 
E) d-Ribose and phosphate ion

Question 15

What are the names of the nucleosides found in RNA?

Accepted Answer

A) Adenosine,uracil,thymine,guanoside 
B) 2'-Deoxyadenosine,2'-deoxythymidine,2'-deoxyguanosine,2'-deoxycytidine 
C) Adenosine,thymidine,guanosine,cytidine 
D) Adenosine,uridine,guanosine,cytidine 
E) Adenine,uracil,guanoside and cytosine 
A) Adenosine,uracil,thymine,guanoside 
B) 2'-Deoxyadenosine,2'-deoxythymidine,2'-deoxyguanosine,2'-deoxycytidine 
C) Adenosine,thymidine,guanosine,cytidine 
D) Adenosine,uridine,guanosine,cytidine 
E) Adenine,uracil,guanoside and cytosine

Question 16

What is the base sequence in the original DNA strand on which the mRNA sequence: CUU-AUG-GCU-UGG-CCC-UAA was made?

Accepted Answer

mRNA CUU-AUG-GCU-UGG

Question 17

The formation of a new DNA molecule which is an exact copy of a pre-existing one is designated by what term?

Accepted Answer

A) Duplication 
B) Transcription 
C) Translation 
D) Replication 
E) Reproduction 
A) Duplication 
B) Transcription 
C) Translation 
D) Replication 
E) Reproduction

Question 18

Which is an incorrect statement concerning DNA structure?

Accepted Answer

A) The base and the phosphate units are linked by phosphodiester bonds. 
B) The sugar and the phosphate units are linked by hydrogen bonds. 
C) The base and the sugar units are linked by $\beta$-N-glycosidic bonds. 
D) Two of these statements are incorrect. 
E) All of these statements are incorrect. 
A) The base and the phosphate units are linked by phosphodiester bonds. 
B) The sugar and the phosphate units are linked by hydrogen bonds. 
C) The base and the sugar units are linked by $\beta$-N-glycosidic bonds. 
D) Two of these statements are incorrect. 
E) All of these statements are incorrect.

Question 19

While proteins are made up of amino acids connected by amide bonds,nucleic acids are made up of nucleotides connected by ___.

Accepted Answer

phosphate

Question 20

Draw the structure with hydrogen bonds between uracil and adenine.

Accepted Answer

The answer of Draw the structure with hydrogen bonds between...

Exam 25: Nucleic Acids and Protein Synthesis

Why does the polymerase enzyme used in the PCR not denature at high temperature?

Which is the messenger codon which calls for the initiation of protein synthesis?

Which of the following is not a pyrimidine?

What are the names of the nucleosides found in DNA?

Complete hydrolysis of adenylic acid would yield which of these?

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

Where is the sequence of bases termed an "anticodon" found?

The anticodon is part of

The following structure represents the less common (in DNA,at least)tautomeric form of ___.

What are the introns?

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?

In DNA,the lactim form of guanine will pair with which base?

An RNA nucleoside will undergo hydrolysis in dilute acid to yield which of the following?

What are the names of the nucleosides found in RNA?

What is the base sequence in the original DNA strand on which the mRNA sequence: CUU-AUG-GCU-UGG-CCC-UAA was made?

The formation of a new DNA molecule which is an exact copy of a pre-existing one is designated by what term?

Which is an incorrect statement concerning DNA structure?

While proteins are made up of amino acids connected by amide bonds,nucleic acids are made up of nucleotides connected by ___.

Draw the structure with hydrogen bonds between uracil and adenine.

The Basics

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Stereochemistry

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

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Amino Acids and Proteins

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