Question 1

Transcription occurs within the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False

Question 2

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False

Question 3

A nucleosome is a linear chromosome wound around the _______.

Accepted Answer

A)  nuclear membrane
B)  rRNA
C)  mRNA
D)  histone
E)  nucleolusF) B) and C)
G) A) and D)

Question 4

The development of virulent, toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of ________.

Accepted Answer

A)  bacterial conjugation
B)  transformation
C)  generalized transduction
D)  specialized transductionE) A) and C)
F) All of the above

Question 5

Base pairs in DNA are held together by ______ bonds.

Accepted Answer

A)  peptide
B)  nonpolar covalent
C)  polar covalent
D)  hydrogen
E)  sulfhydrylF) All of the above
G) B) and C)

Question 6

Which of the following is incorrect about transfer RNA?

Accepted Answer

A)  It has a bottom hairpin loop with an anticodon.
B)  It has an anticodon that is complementary to a codon.
C)  It contains a binding site for an amino acid.
D)  The initiator tRNA that binds to the P site has the anticodon UAC.
E)  The initiator tRNA in bacteria carries tryptophan.F) A) and E)
G) B) and D)

Question 7

An unidentified cell was found to contain introns and exons.It also expresses DNA polymerase and RNA polymerase.Although it exhibits a promoter region, it has no operons.You conclude that this cell

Accepted Answer

A)  is eukaryotic.
B)  is prokaryotic.
C)  is either a prokaryotic or eukaryotic cell.
D)  is actually a virus.E) A) and B)
F) A) and C) A

Question 8

Repressible operons are normally turned on in the cell.

Accepted Answer

A) True 
 B)False

Question 9

DNA Polymerase I

Accepted Answer

A)  removes primers.
B)  adds bases to new DNA chain.
C)  seals DNA gaps.
D)  proofreads DNA chain.E) None of the above
F) A) and C) A

Question 10

Which cell can transfer the most DNA?

Accepted Answer

A)  F+ cell
B)  F-cell
C)  Hfr cell
D)  R cell
E)  B cellF) A) and C)
G) A) and B)

Question 11

What type of mutation alters the base but not the amino acid being coded for?

Accepted Answer

A)  Silent
B)  Back
C)  Point
D)  Nonsense
E)  MissenseF) A) and B)
G) D) and E)

Question 12

Which molecule is translated into an amino acid sequence?

Accepted Answer

A)  Ribosomal RNA
B)  Messenger RNA
C)  Transfer RNA
D)  Primer RNA
E)  RibozymesF) A) and B)
G) C) and D)

Question 13

A ______ is a specific segment of DNA that codes for the production of one functional product.

Accepted Answer

A)  intron
B)  exon
C)  gene
D)  operator
E)  tripletF) A) and B)
G) A) and C)

Question 14

Introns have no detectable functions.

Accepted Answer

A) True 
 B)False

Question 15

The most serious type of mutation is a ______ mutation.

Accepted Answer

A)  point
B)  silent
C)  frameshift
D)  backE) A) and B)
F) C) and D) C

Question 16

Which of the following is not a type of microRNA?

Accepted Answer

A)  tRNA
B)  miRNA
C)  Antisense RNA
D)  Riboswitch
E)  siRNAF) All of the above
G) A) and D)

Question 17

Looking at your results of the Ames test using bacteriological agar medium plates lacking the amino acid histidine, you find that there are many colonies growing on the agar.How do you interpret this result?

Accepted Answer

A)  The bacterium has turned its operon genes on, producing proteins necessary for growth.
B)  The chemical being tested is mutagenic.
C)  The bacterium does not have any plasmids, so it cannot grow on the medium.
D)  The drug being tested has no inhibitory effect on the bacterium; therefore, it is not a good antibiotic to give for treatment of disease.E) C) and D)
F) A) and B)

Question 18

The enzyme that can proofread replicating DNA, detect incorrect bases, excise them, and correctly replace them is _______.

Accepted Answer

A)  DNA ligase
B)  DNA polymerase
C)  DNA helicase
D)  DNA gyrase
E)  primaseF) A) and B)
G) A) and E)

Question 19

RNA polymerase binds to the

Accepted Answer

A)  start codon.
B)  termination sequence.
C)  regulation sequence.
D)  promoter sequence.E) B) and D)
F) C) and D)

Question 20

Gene regulation can involve a protein repressor that blocks ______ from initiating transcription.

Accepted Answer

A)  DNA polymerase I
B)  DNA polymerase III
C)  RNA polymerase
D)  mRNA
E)  rRNAF) None of the above
G) D) and E)

Exam 9: Microbial Genetics

Transcription occurs within the nucleus or at the nucleoid.

Correct AnswerverifiedShow Answer

Excised introns form structures called lariats.

Correct AnswerverifiedShow Answer

A nucleosome is a linear chromosome wound around the _______.

Correct AnswerverifiedShow Answer

The development of virulent, toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of ________.

Correct AnswerverifiedShow Answer

Base pairs in DNA are held together by ______ bonds.

Correct AnswerverifiedShow Answer

Which of the following is incorrect about transfer RNA?

Correct AnswerverifiedShow Answer

An unidentified cell was found to contain introns and exons.It also expresses DNA polymerase and RNA polymerase.Although it exhibits a promoter region, it has no operons.You conclude that this cell

Correct AnswerverifiedA

Repressible operons are normally turned on in the cell.

Correct AnswerverifiedShow Answer

DNA Polymerase I

Correct AnswerverifiedA

Which cell can transfer the most DNA?

Correct AnswerverifiedShow Answer

What type of mutation alters the base but not the amino acid being coded for?

Correct AnswerverifiedShow Answer

Which molecule is translated into an amino acid sequence?

Correct AnswerverifiedShow Answer

A ______ is a specific segment of DNA that codes for the production of one functional product.

Correct AnswerverifiedShow Answer

Introns have no detectable functions.

Correct AnswerverifiedShow Answer

The most serious type of mutation is a ______ mutation.

Correct AnswerverifiedC

Which of the following is not a type of microRNA?

Correct AnswerverifiedShow Answer

Looking at your results of the Ames test using bacteriological agar medium plates lacking the amino acid histidine, you find that there are many colonies growing on the agar.How do you interpret this result?

Correct AnswerverifiedShow Answer

The enzyme that can proofread replicating DNA, detect incorrect bases, excise them, and correctly replace them is _______.

Correct AnswerverifiedShow Answer

RNA polymerase binds to the

Correct AnswerverifiedShow Answer

Gene regulation can involve a protein repressor that blocks ______ from initiating transcription.

Correct AnswerverifiedShow Answer

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A

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A

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C

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