Question 1

Each _____ is a specific segment of the DNA with the code for production of one functional product.

Accepted Answer

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

Question 2

RNA molecules differ from DNA molecules because only RNA

Accepted Answer

A)  has ribose.
B)  has uracil.
C)  is typically one strand of nucleotides.
D)  does not have thymine.
E)  All of these choices are correct.F) A) and B)
G) B) and E)

Question 3

The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called

Accepted Answer

A)  ribosomal RNA.
B)  messenger RNA.
C)  transfer RNA.
D)  primer RNA.
E)  ribozymes.F) A) and D)
G) B) and E)

Question 4

Which of the following is incorrect about transfer RNA?

Accepted Answer

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

Question 5

DNA replication proceeds in one direction around the bacterial chromosome.

Accepted Answer

A) True 
 B)False

Question 6

Replication of DNA begins at a(n)

Accepted Answer

A)  guanine-cytosine rich area.
B)  uracil-adenine rich area.
C)  adenine-thymine rich area.
D)  adenine-cytosine rich area.
E)  guanine-adenine rich area.F) B) and C)
G) A) and C)

Question 7

Repressible operons require that _____ bind to the repressor protein before it can bind to the operator.

Accepted Answer

A)  the product
B)  a cofactor
C)  a coenzyme
D)  the substrate
E)  the reactantF) All of the above
G) A) and B)

Question 8

The most damaging type of mutation is a

Accepted Answer

A)  point mutation.
B)  silent mutation.
C)  frameshift mutation.
D)  back mutation.
E)  All the choices are equally damaging.F) C) and E)
G) None of the above C

Question 9

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

Accepted Answer

A)  primer.
B)  Okazaki fragment.
C)  template.
D)  rolling circle.
E)  replication fork.F) A) and B)
G) B) and E)

Question 10

DNA polymerase I

Accepted Answer

A)  removes primers.
B)  adds bases to new DNA chain.
C)  seals DNA gaps.
D)  proofreads DNA chain.
E)  All of these choices are correct,F) A) and E)
G) B) and D)

Question 11

Which of the following is not true of transposons?

Accepted Answer

A)  can change pigmentation
B)  can replace damaged DNA
C)  can transfer drug resistance
D)  can change the genome
E)  are always part of plasmidsF) B) and C)
G) B) and D) E

Question 12

The DNA of microorganisms is made up of subunits called

Accepted Answer

A)  histones.
B)  amino acids.
C)  nucleotides.
D)  mRNA.
E)  polymerases.F) B) and C)
G) A) and E)

Question 13

The three-base sequence on DNA that codes for an amino acid is called a(n)

Accepted Answer

A)  codon.
B)  exon.
C)  anticodon.
D)  intron.
E)  triplet.F) B) and D)
G) B) and C)

Question 14

The process in which mutations are removed and replaced with the correct bases is called

Accepted Answer

A)  transduction.
B)  excision repair.
C)  frameshift.
D)  back mutation.
E)  transformation.F) A) and D)
G) A) and E)

Question 15

The duplication of a cell's DNA is called

Accepted Answer

A)  mitosis.
B)  replication.
C)  transcription.
D)  translation.
E)  mutation.F) D) and E)
G) A) and C)

Question 16

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATE THE BAG RAT?

Accepted Answer

A)  missense
B)  nonsense
C)  insertion
D)  deletion
E)  silentF) A) and B)
G) A) and C)

Question 17

Which of the following is incorrect about termination codons?

Accepted Answer

A)  They are also called nonsense codons.
B)  They occur where the bond between the final tRNA and the growing polypeptide is broken.
C)  Termination codons include AUG.
D)  Termination codons include UAA, UAG, UGA.
E)  Termination codons do not have corresponding tRNA.F) C) and E)
G) D) and E)

Question 18

Lactose is a corepressor in the lac operon.

Accepted Answer

A) True 
 B)False

Question 19

In bacteria, initiator tRNA carries formyl methionine.

Accepted Answer

A) True 
 B)False

Question 20

Which is incorrect about inducible operons?

Accepted Answer

A)  have genes turned off by a buildup of end product
B)  often encode enzymes for catabolic pathways
C)  are normally turned off
D)  are turned on by the substrate of the enzyme
E)  include the lac operonF) A) and B)
G) A) and C)

Exam 9: Microbial Genetics

Each _____ is a specific segment of the DNA with the code for production of one functional product.

Correct AnswerverifiedShow Answer

RNA molecules differ from DNA molecules because only RNA

Correct AnswerverifiedShow Answer

The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called

Correct AnswerverifiedShow Answer

Which of the following is incorrect about transfer RNA?

Correct AnswerverifiedE

DNA replication proceeds in one direction around the bacterial chromosome.

Correct AnswerverifiedShow Answer

Replication of DNA begins at a(n)

Correct AnswerverifiedShow Answer

Repressible operons require that _____ bind to the repressor protein before it can bind to the operator.

Correct AnswerverifiedShow Answer

The most damaging type of mutation is a

Correct AnswerverifiedC

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

Correct AnswerverifiedShow Answer

DNA polymerase I

Correct AnswerverifiedShow Answer

Which of the following is not true of transposons?

Correct AnswerverifiedE

The DNA of microorganisms is made up of subunits called

Correct AnswerverifiedShow Answer

The three-base sequence on DNA that codes for an amino acid is called a(n)

Correct AnswerverifiedShow Answer

The process in which mutations are removed and replaced with the correct bases is called

Correct AnswerverifiedShow Answer

The duplication of a cell's DNA is called

Correct AnswerverifiedShow Answer

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATE THE BAG RAT?

Correct AnswerverifiedShow Answer

Which of the following is incorrect about termination codons?

Correct AnswerverifiedShow Answer

Lactose is a corepressor in the lac operon.

Correct AnswerverifiedShow Answer

In bacteria, initiator tRNA carries formyl methionine.

Correct AnswerverifiedShow Answer

Which is incorrect about inducible operons?

Correct AnswerverifiedShow Answer

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C

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E

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