Question 1

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) B) and C)

Question 2

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) A) and C)
G) D) and E)

Question 3

Folding of the 5'end of a mRNA, such that binding to the ribosome is altered, is most likely to affect

Accepted Answer

A)   replication.
B)   transcription.
C)   translation.
D)   transformation.E) A) and D)
F) None of the above

Question 4

If a codon for alanine is GCA. What is the anticodon?

Accepted Answer

A)   GCA
B)   CGT
C)   ACG
D)   CGU
E)   UGCF) A) and E)
G) C) and D)

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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 plidsF) B) and C)
G) A) and B)

Question 7

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) None of the above
G) B) and C)

Question 8

The smallest unit of heredity is a chromosome.

Accepted Answer

A) True 
 B)False

Question 9

A primer of ____ is needed at the origin of nucleotide addition.

Accepted Answer

A)   polymerase III
B)   polymerase I
C)   helicase
D)   RNA
E)   DNAF) A) and B)
G) B) and E)

Question 10

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 D)
G) A) and E)

Question 11

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

Accepted Answer

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

Question 12

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) B) and C)
G) A) and E)

Question 13

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) All of the above
F) A) and C)

Question 14

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) B) and D)
G) B) and C)

Question 15

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)   require spliceosomes to excise introns and then join exons.
E)   All of these choices are correct.F) A) and B)
G) B) and C)

Question 16

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) C) and D)
G) A) and C)

Question 17

Lactose is a corepressor in the lac operon.

Accepted Answer

A) True 
 B)False

Question 18

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) A) and C)

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

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) None of the above
F) All of the above

Exam 9: Microbial Genetics

A primer of ____ is needed at the origin of nucleotide addition.

Correct AnswerverifiedShow Answer

Which of the following is not true of transposons?

Correct AnswerverifiedShow Answer

The antiparallel arrangement within DNA molecules refers to

Correct AnswerverifiedShow Answer

Which is incorrect about inducible operons?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Split genes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

DNA polymerase I

Correct AnswerverifiedShow Answer

RNA molecules differ from DNA molecules because only RNA

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Folding of the 5'end of a mRNA, such that binding to the ribosome is altered, is most likely to affect

Correct AnswerverifiedShow Answer

The most damaging type of mutation is a

Correct AnswerverifiedShow Answer

Lactose is a corepressor in the lac operon.

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

The smallest unit of heredity is a chromosome.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The lactose repressor

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a codon for alanine is GCA. What is the anticodon?

Correct AnswerverifiedShow Answer

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