Question 1

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False

Question 2

A mutation that changes a normal codon to a stop codon is called a

Accepted Answer

A)  point mutation.
B)  silent mutation.
C)  back mutation.
D)  missense mutation.
E)  nonsense mutation.F) C) and D)
G) A) and D)

Question 3

The smallest unit of heredity is a chromosome.

Accepted Answer

A) True 
 B)False

Question 4

The transfer of DNA fragments from a dead cell to a live, competent recipient cell that results in a changed recipient cell is

Accepted Answer

A)  transduction.
B)  conjugation.
C)  transformation.
D)  transmission.
E)  mitosis.F) B) and D)
G) A) and B)

Question 5

Synthesis of an inducible enzyme requires

Accepted Answer

A)  repressor alone bound to operator.
B)  substrate bound to repressor.
C)  substrate bound to promoter.
D)  corepressor and repressor binding to operator.E) C) and D)
F) B) and C)

Question 6

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) C) and D)

Question 7

Helicase

Accepted Answer

A)  unwinds DNA.
B)  supercoils DNA.
C)  unwinds RNA.
D)  winds RNA.E) None of the above
F) B) and C)

Question 8

Genes that jump from one location to another in the genome are

Accepted Answer

A)  repressors.
B)  transposons.
C)  transformers.
D)  plasmids.
E)  operons.F) None of the above
G) B) and D)

Question 9

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Accepted Answer

A)  promoter.
B)  operator.
C)  operon.
D)  exon.
E)  intron.F) A) and C)
G) C) and D)

Question 10

DNA gyrase

Accepted Answer

A)  unwinds DNA.
B)  supercoils DNA.
C)  cleaves DNA.
D)  joins free DNA ends.E) C) and D)
F) A) and B)

Question 11

Riboswitches exert effects on ______________ whereas repressors and inducers exert effects on ________________.

Accepted Answer

A)  replication; translation
B)  translation; transcription.
C)  replication; translation,
D)  translation; transcriptionE) None of the above
F) A) and B)

Question 12

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 (stop) ?

Accepted Answer

A)  Missense
B)  Nonsense
C)  Insertion
D)  Deletion
E)  SilentF) B) and D)
G) All of the above

Question 13

What molecule is synthesized as a copy of a gene from the DNA template strand?

Accepted Answer

A)  ribosomal RNA
B)  messenger RNA
C)  transfer RNA
D)  primer RNA
E)  ribozymesF) A) and C)
G) B) and D)

Question 14

DNA polymerase can only add new nucleotides to the old 3'DNA end.

Accepted Answer

A) True 
 B)False

Question 15

In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated Streptococci were converted into smooth encapsulated Streptococci in the presence of the heat-killed smooth encapsulated Streptococci.What is the term that describes this process?

Accepted Answer

A)  transduction
B)  conjugation
C)  transformation
D)  cloningE) A) and D)
F) All of the above

Question 16

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

Accepted Answer

A)  DNA ligase.
B)  DNA polymerase.
C)  DNA helicase.
D)  DNA gyrase.
E)  primase.F) A) and D)
G) A) and E)

Question 17

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATA ETH EBI GRA T?

Accepted Answer

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

Question 18

The analysis of the nitrogenous bases of the nucleic acid of a newly discovered virus showed 20% adenine, 40% guanine, 10% thymine, and 30% cytosine.The viral nucleic acid is most likely

Accepted Answer

A)  double-stranded DNA.
B)  double-stranded RNA.
C)  single-stranded RNA.
D)  single-stranded DNA.E) None of the above
F) All of the above

Question 19

The lactose repressor

Accepted Answer

A)  is transcribed with the structural lac genes.
B)  is activated by binding lactose.
C)  is inactivated by binding lactose.
D)  requires lactose for its transcription.E) A) and C)
F) None of the above

Question 20

Bacterial conjugation involves

Accepted Answer

A)  bacteriophage carrying donor DNA to the recipient cell.
B)  a donor cell that transfers a copy of a plasmid to a recipient cell through a pilus.
C)  the take-up of naked DNA fragments from a lysed donor cell by a recipient cell.
D)  new progeny cells with genes from two parent bacterial cells.E) A) and B)
F) B) and D)

Exam 9: Microbial Genetics

The lactose repressor

Correct AnswerverifiedShow Answer

Riboswitches exert effects on ______________ whereas repressors and inducers exert effects on ________________.

Correct AnswerverifiedShow Answer

Bacterial conjugation involves

Correct AnswerverifiedShow Answer

What molecule is synthesized as a copy of a gene from the DNA template strand?

Correct AnswerverifiedShow Answer

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

Correct AnswerverifiedShow Answer

Base pairs in DNA are held together by _____ bonds.

Correct AnswerverifiedShow Answer

DNA gyrase

Correct AnswerverifiedShow Answer

A mutation that changes a normal codon to a stop codon is called a

Correct AnswerverifiedShow Answer

The transfer of DNA fragments from a dead cell to a live, competent recipient cell that results in a changed recipient cell is

Correct AnswerverifiedShow Answer

The analysis of the nitrogenous bases of the nucleic acid of a newly discovered virus showed 20% adenine, 40% guanine, 10% thymine, and 30% cytosine.The viral nucleic acid is most likely

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 (stop) ?

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 ATA ETH EBI GRA T?

Correct AnswerverifiedShow Answer

Synthesis of an inducible enzyme requires

Correct AnswerverifiedShow Answer

The smallest unit of heredity is a chromosome.

Correct AnswerverifiedShow Answer

Genes that jump from one location to another in the genome are

Correct AnswerverifiedShow Answer

DNA polymerase can only add new nucleotides to the old 3'DNA end.

Correct AnswerverifiedShow Answer

Helicase

Correct AnswerverifiedShow Answer

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Correct AnswerverifiedShow Answer

Excised introns form structures called lariats.

Correct AnswerverifiedShow Answer

In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated Streptococci were converted into smooth encapsulated Streptococci in the presence of the heat-killed smooth encapsulated Streptococci.What is the term that describes this process?

Correct AnswerverifiedShow Answer

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Riboswitches exert effects on whereas repressors and inducers exert effects on __.

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