Question 1

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is

Accepted Answer

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

Question 2

A sequence of bases within a gene that will be transcribed, but removed from the transcript prior to translation is a/an

Accepted Answer

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

Question 3

Which of the following additions have been made to principles of the central dogma of biology?

Accepted Answer

A)  DNA information cannot be converted into RNA information.
B)  Protein information can be converted into DNA information.
C)  RNA can be used to regulate gene function.
D)  DNA codes for proteins.
E)  All of these choices are correct.F) A) and C)
G) C) and D)

Question 4

Hfr transfer involves all of the following except

Accepted Answer

A)  gene integration into the bacterial chromosome.
B)  plasmid gene transfer.
C)  F factor is part of the F+ donor chromosome.
D)  high frequency transfer.
E)  a pilus connection between F+ and F- cells.F) B) and E)
G) B) and D)

Question 5

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) All of the above
G) A) and B)

Question 6

A nucleosome is a linear chromosome wound around the

Accepted Answer

A)  nuclear membrane.
B)  rRNA.
C)  mRNA.
D)  histone.
E)  nucleolus.F) C) and E)
G) C) and D)

Question 7

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)  primase.F) D) and E)
G) B) and C)

Question 8

The antiparallel arrangement within DNA molecules refers to

Accepted Answer

A)  each base bonding at the 1'position of the sugar.
B)  a purine always bonding to a pyrimidine.
C)  one helix strand that runs from the 5'to 3'direction and the other strand runs from the 3'to 5'direction.
D)  an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.E) A) and B)
F) All of the above

Question 9

Of the following list, which antibiotics affect protein synthesis?

Accepted Answer

A)  penicillin
B)  tetracycline
C)  chloramphenicol
D)  ciprofloxacin
E)  Both tetracycline and chloramphenicol are correct.F) D) and E)
G) All of the above

Question 10

Groups of three consecutive bases along the DNA of a gene have the code for one

Accepted Answer

A)  protein.
B)  nucleotide.
C)  amino acid.
D)  purine.E) None of the above
F) C) and D)

Question 11

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 genes.F) A) and B)
G) A) and E)

Question 12

Short interfering RNAs affect gene expression in eukaryotes by

Accepted Answer

A)  blocking replication of certain genes.
B)  blocking transcription of certain genes.
C)  binding to mRNAs and preventing translation.
D)  binding to ribosomes, preventing the two subunits from joining.E) None of the above
F) A) and B)

Question 13

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) C) and E)

Question 14

Synthesis of a repressible enzyme is inhibited by

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) None of the above
F) All of the above

Question 15

All of the following pertain to nitrogenous bases except

Accepted Answer

A)  they form pairs by hydrogen bonding.
B)  guanine pairs with uracil.
C)  adenine pairs with thymine.
D)  cytosine and thymine are pyrimidines.
E)  they allow variation from one nucleotide to another which creates the encoded information.F) C) and E)
G) A) and B)

Question 16

Introns have no detectable functions.

Accepted Answer

A) True 
 B)False

Question 17

A permanent, inheritable change in the genetic information is called a(n)

Accepted Answer

A)  translation.
B)  transcription.
C)  mutation.
D)  alteration.
E)  regeneration.F) C) and E)
G) A) and D)

Question 18

While studying the infection process and life cycle of a newly discovered virus, it was determined that the virus never entered the nucleus of the host cell.This virus may have any of the following genomes except

Accepted Answer

A)  DNA.
B)  double-stranded RNA.
C)  single (+)  strand RNA.
D)  single (-)  strand RNA.E) All of the above
F) A) and B)

Question 19

DNA photolyase, in the presence of visible light, can repair DNA damage due to ultraviolet radiation.

Accepted Answer

A) True 
 B)False

Question 20

Each nucleotide is composed of

Accepted Answer

A)  one phosphate, one nitrogenous base, one sugar.
B)  one phosphate, one nitrogenous base, two sugars.
C)  two phosphates, one nitrogenous base, one sugar.
D)  two phosphates, one nitrogenous base, two sugars.
E)  one phosphate, two nitrogenous bases, one sugar.F) A) and E)
G) A) and D)

Exam 9: Microbial Genetics

Synthesis of a repressible enzyme is inhibited by

Correct AnswerverifiedShow Answer

Which of the following is not true of conjugation?

Correct AnswerverifiedShow Answer

Each nucleotide is composed of

Correct AnswerverifiedShow Answer

Which of the following additions have been made to principles of the central dogma of biology?

Correct AnswerverifiedShow Answer

A permanent, inheritable change in the genetic information is called a(n)

Correct AnswerverifiedShow Answer

Groups of three consecutive bases along the DNA of a gene have the code for one

Correct AnswerverifiedShow Answer

Introns have no detectable functions.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A sequence of bases within a gene that will be transcribed, but removed from the transcript prior to translation is a/an

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Hfr transfer involves all of the following except

Correct AnswerverifiedShow Answer

Short interfering RNAs affect gene expression in eukaryotes by

Correct AnswerverifiedShow Answer

All of the following pertain to nitrogenous bases except

Correct AnswerverifiedShow Answer

While studying the infection process and life cycle of a newly discovered virus, it was determined that the virus never entered the nucleus of the host cell.This virus may have any of the following genomes except

Correct AnswerverifiedShow Answer

DNA photolyase, in the presence of visible light, can repair DNA damage due to ultraviolet radiation.

Correct AnswerverifiedShow Answer

The antiparallel arrangement within DNA molecules refers to

Correct AnswerverifiedShow Answer

A nucleosome is a linear chromosome wound around the

Correct AnswerverifiedShow Answer

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is

Correct AnswerverifiedShow Answer

Of the following list, which antibiotics affect protein synthesis?

Correct AnswerverifiedShow Answer

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