Question 1

Which of the following is incorrect about termination codons?

Accepted Answer

A)  Are also called nonsense codons
B)  Where the bond between the final tRNA and the growing polypeptide is broken
C)  Include AUG
D)  Include UAA, UAG, UGA
E)  Do not have corresponding tRNAF) C) and D)
G) B) and E)

Question 2

The jumping of a gene from one location to another is done by

Accepted Answer

A)  Conjugation
B)  Transposons
C)  Transformation
D)  Transduction
E)  TransmissionF) B) and D)
G) B) and C)

Question 3

Structural genes code for

Accepted Answer

A)  Ribosomal RNA molecules
B)  Transfer RNA molecules
C)  Cellular proteins
D)  Gene expression elements
E)  All of the choices are correctF) A) and C)
G) A) and D)

Question 4

Split genes

Accepted Answer

A)  Are common in prokaryotes and eukaryotes
B)  Only have exons initially transcribed to mRNA
C)  Have introns located only at the beginning and end of a coding region
D)  Use spliceosomes to excise introns and then join exons
E)  All of the choices are correctF) A) and B)
G) All of the above

Question 5

DNA replication proceeds in one direction around the bacterial chromosome.

Accepted Answer

A) True 
 B)False

Question 6

Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have

Accepted Answer

A)  Histone proteins
B)  Chromosomes in a nucleus
C)  Several to many chromosomes
D)  Elongated, not circular, chromosomes
E)  All of the choices are correctF) B) and E)
G) A) and B)

Question 7

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

Accepted Answer

A)  Promoter
B)  Operator
C)  Operon
D)  Exon
E)  IntronF) B) and D)
G) A) and B)

Question 8

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)  PrimaseF) A) and B)
G) B) and C)

Question 9

Introns have no detectable functions.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is not true of conjugation?

Accepted Answer

A)  Involves direct contact between cells
B)  Transfers genes for drug resistance
C)  Transfers genes for enzymes and adherence molecules
D)  Transfers genes for a polysaccharide capsule
E)  The donor retains a copy of the transferred genesF) B) and D)
G) B) and E)

Question 11

Okazaki fragments are attached to the growing end of the lagging strand by

Accepted Answer

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

Question 12

The duplication of a cell's DNA is called

Accepted Answer

A)  Mitosis
B)  Replication
C)  Transcription
D)  Translation
E)  MutationF) C) and E)
G) B) and D)

Question 13

This molecule is synthesized as a copy of a gene on the DNA template strand

Accepted Answer

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

Question 14

RNA polymerase binds to the

Accepted Answer

A)  Start codon
B)  Termination sequence
C)  Regulation sequence
D)  Promoter sequence
E)  None of the choices are correctF) C) and E)
G) D) and E)

Question 15

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)  TripletF) A) and E)
G) A) and C)

Question 16

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 tryptophanF) None of the above
G) C) and E)

Question 17

The smallest unit of heredity is a chromosome.

Accepted Answer

A) True 
 B)False

Question 18

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 areaF) A) and B)
G) B) and E)

Question 19

In Griffith's experiments with Streptococcus pneumoniae, rough non-encapsulated 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 B)
F) A) and C)

Question 20

A nucleosome is a linear chromosome wound around the

Accepted Answer

A)  Nuclear membrane
B)  rRNA
C)  mRNA
D)  Histone
E)  NucleolusF) A) and E)
G) C) and E)

Exam 9: An Introduction to Microbial Genetics

In Griffith's experiments with Streptococcus pneumoniae, rough non-encapsulated 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?

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The jumping of a gene from one location to another is done by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The smallest unit of heredity is a chromosome.

Correct AnswerverifiedShow Answer

DNA replication proceeds in one direction around the bacterial chromosome.

Correct AnswerverifiedShow Answer

Which of the following is incorrect about transfer RNA?

Correct AnswerverifiedShow Answer

Replication of DNA begins at a(n)

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Which of the following is incorrect about termination codons?

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Which of the following is not true of conjugation?

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

Correct AnswerverifiedShow Answer

This molecule is synthesized as a copy of a gene on the DNA template strand

Correct AnswerverifiedShow Answer

A nucleosome is a linear chromosome wound around the

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Split genes

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Okazaki fragments are attached to the growing end of the lagging strand by

Correct AnswerverifiedShow Answer

Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have

Correct AnswerverifiedShow Answer

RNA polymerase binds to the

Correct AnswerverifiedShow Answer

The duplication of a cell's DNA is called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Structural genes code for

Correct AnswerverifiedShow Answer

Introns have no detectable functions.

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