Question 1

Consider the following reaction.     In the sequence of protein synthesis, what type of reaction is this?

Accepted Answer

A)  activation 
B)  initiation 
C)  elongation 
D)  translocation 
E)  termination 
A)  activation 
B)  initiation 
C)  elongation 
D)  translocation 
E)  termination

Question 2

Which polymerases interact with their promoters via transcription factors?

Accepted Answer

A)  pol I 
B)  pol II 
C)  pol III 
D)  all of these 
A)  pol I 
B)  pol II 
C)  pol III 
D)  all of these

Question 3

A sequence of how many bases is needed to code for an amino acid?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 4

Which of the following is true of enhancers?

Accepted Answer

A)  They are always located next to the TATA box. 
B)  They are always part of the promoter. 
C)  They are always located far from the promoter. 
D)  They may be located far from the promoter. 
A)  They are always located next to the TATA box. 
B)  They are always part of the promoter. 
C)  They are always located far from the promoter. 
D)  They may be located far from the promoter.

Question 5

Which of the following is the vector commonly used in in vivo gene therapy?

Accepted Answer

A)  adenovirus 
B)  Maloney murine leukemia virus 
C)  weakened flu virus 
D)  vaccinia virus 
A)  adenovirus 
B)  Maloney murine leukemia virus 
C)  weakened flu virus 
D)  vaccinia virus

Question 6

Which of the following is not deficient in patients with severe combined immune deficiency?

Accepted Answer

A)  dATP 
B)  dCTP 
C)  dGTP 
D)  dTTP 
A)  dATP 
B)  dCTP 
C)  dGTP 
D)  dTTP

Question 7

Which of the following is involved in unwinding the DNA double helix?

Accepted Answer

A)  acetylase 
B)  helicase 
C)  binding proteins 
D)  polymerases 
A)  acetylase 
B)  helicase 
C)  binding proteins 
D)  polymerases

Question 8

Examine the following diagram.  
-Which of the following processes is represented?

Accepted Answer

A)  DNA replication 
B)  transcription 
C)  translation 
A)  DNA replication 
B)  transcription 
C)  translation

Question 9

The restriction endonuclease EcoRI recognizes the sequence GAATTC and cuts it between G and A on both strands. What sticky ends will be produced when EcoRI cuts the sequence which follows?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 10

During elongation how many of the general transcription factors remain bound to the TATA box?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
A)  0 
B)  1 
C)  2 
D)  3

Question 11

Where on the tRNA molecule is the anticodon located?

Accepted Answer

A)  at the 3' end 
B)  at the 5' end 
C)  in a loop in the molecule which is physically far from the 3' end 
D)  in a loop in the molecule which is physically near to the 3' end 
A)  at the 3' end 
B)  at the 5' end 
C)  in a loop in the molecule which is physically far from the 3' end 
D)  in a loop in the molecule which is physically near to the 3' end

Question 12

Which of the following catalyzes peptide bond formation during protein synthesis?

Accepted Answer

A)  a purine of the ribosomal RNA 
B)  a pyrimidine of the ribosomal RNA 
C)  a specialized protein found in the ribosome 
D)  all of the above 
A)  a purine of the ribosomal RNA 
B)  a pyrimidine of the ribosomal RNA 
C)  a specialized protein found in the ribosome 
D)  all of the above

Question 13

Restriction endonucleases do which of the following?

Accepted Answer

A)  cleave DNA at very specific locations based on the sequence of bases 
B)  limit which bases can be at the ends of a strand of DNA 
C)  remove specific codons DNA 
D)  remove specific exons from DNA 
A)  cleave DNA at very specific locations based on the sequence of bases 
B)  limit which bases can be at the ends of a strand of DNA 
C)  remove specific codons DNA 
D)  remove specific exons from DNA

Question 14

Which of the following describes a plasmid?

Accepted Answer

A)  It is a circular loop of double stranded DNA. 
B)  It is a left handed double helix of DNA. 
C)  It is a single stranded DNA. 
D)  None of these is correct. 
A)  It is a circular loop of double stranded DNA. 
B)  It is a left handed double helix of DNA. 
C)  It is a single stranded DNA. 
D)  None of these is correct.

Question 15

During protein synthesis how is the code on mRNA read?

Accepted Answer

A)  in the 3' → 5'direction 
B)  in the 5' → 3' direction 
C)  Starting from the methionine codon it is read in both directions. 
D)  Starting from the middle codon it is read in both directions. 
A)  in the 3' → 5'direction 
B)  in the 5' → 3' direction 
C)  Starting from the methionine codon it is read in both directions. 
D)  Starting from the middle codon it is read in both directions.

Question 16

Which of the following is the consensus base sequence of a TATA box?

Accepted Answer

A)  TATA 
B)  TATATA 
C)  TATAAT 
D)  TTAATTAA 
A)  TATA 
B)  TATATA 
C)  TATAAT 
D)  TTAATTAA

Question 17

How many different codons are there?

Accepted Answer

A)  3 
B)  20 
C)  64 
D)  256 
A)  3 
B)  20 
C)  64 
D)  256

Question 18

Which type of radiation is capable of causing a mutation?

Accepted Answer

A)  microwaves 
B)  radio waves 
C)  ultraviolet light 
D)  all of these 
A)  microwaves 
B)  radio waves 
C)  ultraviolet light 
D)  all of these

Question 19

Which portion of a eukaryotic gene carries information which will be transcribed to the RNA?

Accepted Answer

A)  the entire gene 
B)  the promoter 
C)  the regulatory portion 
D)  the structural gene 
A)  the entire gene 
B)  the promoter 
C)  the regulatory portion 
D)  the structural gene

Question 20

How is an amino acid transported by tRNA?

Accepted Answer

A)  It is bound to the 3' end. 
B)  It is bound to the 5' end. 
C)  It is bound to either the 3' or the 5' end. 
D)  It is enveloped by the tRNA. 
A)  It is bound to the 3' end. 
B)  It is bound to the 5' end. 
C)  It is bound to either the 3' or the 5' end. 
D)  It is enveloped by the tRNA.

Exam 26: Gene Expression and Protein Synthesis

Consider the following reaction. In the sequence of protein synthesis, what type of reaction is this?

Which polymerases interact with their promoters via transcription factors?

A sequence of how many bases is needed to code for an amino acid?

Which of the following is true of enhancers?

Which of the following is the vector commonly used in in vivo gene therapy?

Which of the following is not deficient in patients with severe combined immune deficiency?

Which of the following is involved in unwinding the DNA double helix?

Examine the following diagram. -Which of the following processes is represented?

The restriction endonuclease EcoRI recognizes the sequence GAATTC and cuts it between G and A on both strands. What sticky ends will be produced when EcoRI cuts the sequence which follows?

During elongation how many of the general transcription factors remain bound to the TATA box?

Where on the tRNA molecule is the anticodon located?

Which of the following catalyzes peptide bond formation during protein synthesis?

Restriction endonucleases do which of the following?

Which of the following describes a plasmid?

During protein synthesis how is the code on mRNA read?

Which of the following is the consensus base sequence of a TATA box?

How many different codons are there?

Which type of radiation is capable of causing a mutation?

Which portion of a eukaryotic gene carries information which will be transcribed to the RNA?

How is an amino acid transported by tRNA?

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