Question 1

Aminoacyl-tRNA synthetases catalyze covalent addition of __________ __________ to tRNAs.

Accepted Answer

The answer of Aminoacyl-tRNA synthetases catalyze covalent addition of __________...

Question 2

Over twisting or under twisting of helical DNA generates

Accepted Answer

A)  hypertwists.
B)  hypotwists.
C)  hypercoils.
D)  supercoils.E) None of the above
F) A) and D)

Question 3

All prokaryotes initiate the synthesis of proteins with formylmethionine.

Accepted Answer

A) True 
 B)False

Question 4

When RNA polymerase catalyzes the addition of a nucleotide to a growing mRNA chain,a byproduct of this reaction is

Accepted Answer

A)  phosphate.
B)  pyrophosphate.
C)  orthophosphate.
D)  water.E) B) and C)
F) C) and D)

Question 5

The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein is called

Accepted Answer

A)  replication.
B)  transcription.
C)  reverse transcription.
D)  translation.E) B) and C)
F) C) and D)

Question 6

Each chromosome has one or more __________ site(s) where replication begins.

Accepted Answer

A)  promoter
B)  replicon
C)  origin
D)  bifurcateE) C) and D)
F) B) and D)

Question 7

Hershey and Chase demonstrated that when the bacteriophage T2 infected its host cell,the __________ is injected into the host but the __________ remained outside.

Accepted Answer

The answer of Hershey and Chase demonstrated that when the...

Question 8

What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?

Accepted Answer

A)  20.
B)  61.
C)  64.
D)  as many as there are different tRNAs.E) C) and D)
F) B) and C)

Question 9

Which of the following is not a complementary base pair usually found in DNA molecules?

Accepted Answer

A)  adenine-thymine
B)  guanine-cytosine
C)  adenine-uracil
D)  all of the choicesE) A) and D)
F) None of the above

Question 10

The transcribed and translated region of a gene is the __________ region.

Accepted Answer

A)  leader
B)  promoter
C)  coding
D)  trailerE) B) and C)
F) A) and B)

Question 11

A section of DNA that codes for a protein or other functional product is called a(n)

Accepted Answer

A)  codon.
B)  gene.
C)  replicon.
D)  anticodon.E) A) and B)
F) A) and C)

Question 12

The B form of the DNA double helix contains a wider major groove and a narrower minor groove because the two polynucleotide strands are not positioned directly opposite one another in the helical cylinder.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following is true about the structure of DNA?

Accepted Answer

A)  Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars.
B)  Purine and pyrimidine bases are joined by phosphodiester bonds.
C)  Adjacent bases are stacked on top of each other,one base pair every 0.34 nm.
D)  all of the choicesE) A) and B)
F) All of the above

Question 14

Which of the following nitrogenous bases is usually found in RNA but not in DNA?

Accepted Answer

A)  adenine
B)  thymine
C)  uracil
D)  guanineE) None of the above
F) C) and D)

Question 15

Key sequences exist within promoters,which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position.These representations are called __________ sequences.

Accepted Answer

A)  convergence
B)  idealized
C)  consensus
D)  commonE) B) and D)
F) B) and C)

Question 16

During replication the 2 strands of the DNA molecule are unwound from one another by enzymes called

Accepted Answer

A)  ligases.
B)  unwindases.
C)  helicases.
D)  primases.E) A) and D)
F) A) and C)

Question 17

The noncoding sequences located between the start codon and the stop codon in interrupted genes are called introns.

Accepted Answer

A) True 
 B)False

Question 18

________ molecules deliver amino acids to ribosomes during translation.

Accepted Answer

A)  Messenger RNA (mRN
A)  
B)  Transfer RNA (tRN
A)  
C)  Ribosomal RNA (rRN
A)  
D)  Heterogeneous nuclear RNA (hnRN
A)  E) None of the above
F) A) and D)

Question 19

Which of the following is in the coding region of a gene?

Accepted Answer

A)  promoter
B)  leader
C)  trailer
D)  none of the choicesE) All of the above
F) A) and B)

Question 20

Which of the following is not a pyrimidine?

Accepted Answer

A)  adenine
B)  cytosine
C)  thymine
D)  uracilE) A) and B)
F) A) and C)

Exam 13: Bacterial Genome Replication and Expression

During replication the 2 strands of the DNA molecule are unwound from one another by enzymes called

Correct AnswerverifiedShow Answer

Which of the following is not a complementary base pair usually found in DNA molecules?

Correct AnswerverifiedShow Answer

The noncoding sequences located between the start codon and the stop codon in interrupted genes are called introns.

Correct AnswerverifiedShow Answer

All prokaryotes initiate the synthesis of proteins with formylmethionine.

Correct AnswerverifiedShow Answer

Which of the following nitrogenous bases is usually found in RNA but not in DNA?

Correct AnswerverifiedShow Answer

Which of the following is true about the structure of DNA?

Correct AnswerverifiedShow Answer

A section of DNA that codes for a protein or other functional product is called a(n)

Correct AnswerverifiedShow Answer

Which of the following is not a pyrimidine?

Correct AnswerverifiedShow Answer

The transcribed and translated region of a gene is the __________ region.

Correct AnswerverifiedShow Answer

When RNA polymerase catalyzes the addition of a nucleotide to a growing mRNA chain,a byproduct of this reaction is

Correct AnswerverifiedShow Answer

Which of the following is in the coding region of a gene?

Correct AnswerverifiedShow Answer

Hershey and Chase demonstrated that when the bacteriophage T2 infected its host cell,the __________ is injected into the host but the __________ remained outside.

Correct AnswerverifiedShow Answer

Aminoacyl-tRNA synthetases catalyze covalent addition of __________ __________ to tRNAs.

Correct AnswerverifiedShow Answer

________ molecules deliver amino acids to ribosomes during translation.

Correct AnswerverifiedShow Answer

The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein is called

Correct AnswerverifiedShow Answer

What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?

Correct AnswerverifiedShow Answer

The B form of the DNA double helix contains a wider major groove and a narrower minor groove because the two polynucleotide strands are not positioned directly opposite one another in the helical cylinder.

Correct AnswerverifiedShow Answer

Each chromosome has one or more __________ site(s) where replication begins.

Correct AnswerverifiedShow Answer

Over twisting or under twisting of helical DNA generates

Correct AnswerverifiedShow Answer

Key sequences exist within promoters,which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position.These representations are called __________ sequences.

Correct AnswerverifiedShow Answer

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Hershey and Chase demonstrated that when the bacteriophage T2 infected its host cell,the is injected into the host but the remained outside.

Correct Answer
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Aminoacyl-tRNA synthetases catalyze covalent addition of to tRNAs.

Correct Answer
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