Question 1

Which of the following is not a type of microRNA?

Accepted Answer

A)   tRNA
B)   miRNA
C)   Antisense RNA
D)   Riboswitch
E)   siRNAF) C) and D)
G) A) and E)

Question 2

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is _______.

Accepted Answer

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

Question 3

DNA gyrase

Accepted Answer

A)   copies DNA bases.
B)   synthesizes RNA primers.
C)   closes gaps between DNA bases.
D)   removes supercoiling ahead of origin.E) A) and B)
F) A) and C)

Question 4

Streptomycin,an aminoglycoside,inhibits protein synthesis

Accepted Answer

A)   by preventing the formation of the initiation complex.
B)   by binding to the tRNA preventing peptide bond formation between amino acids.
C)   by binding to the ribosome, preventing translocation due to interference with the attachment of mRNA.
D)   by interfering with both the initiation and elongation stages of translation.E) A) and D)
F) B) and D)

Question 5

Which of the following is incorrect about transfer RNA?

Accepted Answer

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

Question 6

Which of the following is not true of an organism's genotype?

Accepted Answer

A)   It contains structural genes that code for proteins.
B)   It has regulatory genes that control gene expression.
C)   It contains genes that code for RNA.
D)   It is inherited.
E)   It has expressed traits governed by the genes.F) A) and E)
G) A) and B)

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

The DNA of an organism is made up of subunits called _______.

Accepted Answer

A)   histones
B)   amino acids
C)   nucleotides
D)   mRNA
E)   polymerasesF) D) and E)
G) C) and E)

Question 9

Lactose is a corepressor in the lac operon.

Accepted Answer

A) True 
 B)False

Question 10

A permanent,inheritable change in the genetic information is called ________.

Accepted Answer

A)   translation
B)   transcription
C)   a mutation
D)   an alteration
E)   regenerationF) A) and E)
G) All of the above

Question 11

The most serious type of mutation is a ______ mutation.

Accepted Answer

A)   point
B)   silent
C)   frameshift
D)   backE) A) and D)
F) None of the above

Question 12

A primer comprised 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 D)
G) A) and B)

Question 13

A bacterial cell has replicated its plasmid,and when this cell divides into 2 daughter cells,each cell receives one copy of the plasmid.This is an example of horizontal gene transfer.

Accepted Answer

A) True 
 B)False

Question 14

Eukaryotic chromosomes differ from bacterial 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 correct.F) A) and C)
G) B) and C)

Question 15

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 the choices are correct.F) A) and E)
G) All of the above

Question 16

If a codon for alanine is GCA,then the anticodon is ______.

Accepted Answer

A)   GCA
B)   CGT
C)   ACG
D)   CGU
E)   UGCF) All of the above
G) A) and D)

Question 17

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) B) and E)
G) A) and D)

Question 18

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

Accepted Answer

A)   point
B)   silent
C)   back
D)   missense
E)   nonsenseF) B) and D)
G) D) and E)

Question 19

The fundamental difference between an organism's genotype and its phenotype is that

Accepted Answer

A)   the phenotype refers to all of the genetic material in the organism, whereas the genotype represents only the genetic material that is expressed into proteins.
B)   the genotype refers to the organism's genes and the phenotype refers to the non-coding segments of DNA.
C)   the genotype refers to eukaryotic genes that contain both introns and exons, whereas phenotype refers to bacterial DNA that has only exons.
D)   the genotype refers to all of the genetic material in the organism, whereas the phenotype represents only the genetic material that is expressed into proteins.E) All of the above
F) C) and D)

Question 20

The field of genomics refers to

Accepted Answer

A)   the study of an organism's complete genome, including plasmid, mitochondrial, and chloroplast DNA.
B)   the study of chromosomal DNA.
C)   the study of an organism's plasmids.
D)   the study of cellular, but not viral, genomes.E) A) and D)
F) C) and D)

Exam 9: Microbial Genetics

If a codon for alanine is GCA,then the anticodon is ______.

Correct AnswerverifiedShow Answer

The most serious type of mutation is a ______ mutation.

Correct AnswerverifiedShow Answer

DNA gyrase

Correct AnswerverifiedShow Answer

The field of genomics refers to

Correct AnswerverifiedShow Answer

A permanent,inheritable change in the genetic information is called ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is incorrect about transfer RNA?

Correct AnswerverifiedShow Answer

Which of the following is not a type of microRNA?

Correct AnswerverifiedShow Answer

RNA molecules differ from DNA molecules because only RNA

Correct AnswerverifiedShow Answer

A primer comprised of _______ is needed at the origin of nucleotide addition.

Correct AnswerverifiedShow Answer

The DNA of an organism is made up of subunits called _______.

Correct AnswerverifiedShow Answer

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is _______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Lactose is a corepressor in the lac operon.

Correct AnswerverifiedShow Answer

Eukaryotic chromosomes differ from bacterial chromosomes because only eukaryotes have

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The fundamental difference between an organism's genotype and its phenotype is that

Correct AnswerverifiedShow Answer

A bacterial cell has replicated its plasmid,and when this cell divides into 2 daughter cells,each cell receives one copy of the plasmid.This is an example of horizontal gene transfer.

Correct AnswerverifiedShow Answer

Streptomycin,an aminoglycoside,inhibits protein synthesis

Correct AnswerverifiedShow Answer

Which of the following is not true of an organism's genotype?

Correct AnswerverifiedShow Answer

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