Question 1

All of the following pertain to transcription except

Accepted Answer

A)   occurs on a ribosome in the cytopl.
B)   occurs before translation.
C)   requires RNA polymerase.
D)   requires a template DNA strand.
E)   is a process of protein synthesis.F) B) and C)
G) B) and E)

Question 2

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) A) and B)
F) A) and C)

Question 3

All mutations are harmful to the cell.

Accepted Answer

A) True 
 B)False

Question 4

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 E)
G) All of the above

Question 5

The following pertain to ribosomes during protein synthesis except

Accepted Answer

A)   they contain codons within their rRNA molecules.
B)   ribosomes participate only in translation.
C)   ribosomes bind to the 5'end of mRNA by their small subunit.
D)   ribosomes use their large subunit to supply enzymes for peptide bonding.
E)   ribosomes shift toward the 3'end of the mRNA strand from one codon to the next.F) A) and D)
G) B) and D)

Question 6

The gene of an operon that codes for a protein repressor is called the

Accepted Answer

A)   operator.
B)   structural locus.
C)   regulator.
D)   promoter.E) B) and C)
F) All of the above C

Question 7

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

Accepted Answer

A)   repressors.
B)   transposons.
C)   transformers.
D)   plids.
E)   operons.F) C) and E)
G) D) and E)

Question 8

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 C)
G) C) and D)

Question 9

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False

Question 10

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) B) and C)

Question 11

Which of the following is incorrect about termination codons?

Accepted Answer

A)   They are also called nonsense codons.
B)   They occur where the bond between the final tRNA and the growing polypeptide is broken.
C)   Termination codons include AUG.
D)   Termination codons include UAA, UAG, UGA.
E)   Termination codons do not have corresponding tRNA.F) B) and D)
G) C) and D) C

Question 12

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 linear, not circular, chromosomes.
E)   All of these choices are correct.F) A) and B)
G) B) and E)

Question 13

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) B) and C)
F) A) and B)

Question 14

Repressible operons are normally turned on in the cell.

Accepted Answer

A) True 
 B)False  True

Question 15

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) A) and B)

Question 16

Replication of DNA begins at an)

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 area.F) All of the above
G) A) and B)

Question 17

A nucleosome is a linear chromosome wound around the

Accepted Answer

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

Question 18

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

Accepted Answer

A)   replication; translation
B)   translation; transcription
C)   replication; translation.
D)   translation; transcription.E) B) and C)
F) All of the above

Question 19

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 D)
G) A) and E)

Question 20

The expression of genetic traits is the

Accepted Answer

A)   genome.
B)   genotype.
C)   proteome.
D)   phenotype.
E)   proteotype.F) A) and D)
G) B) and D)

Exam 9: Microbial Genetics

All of the following pertain to transcription 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

All mutations are harmful to the cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The following pertain to ribosomes during protein synthesis except

Correct AnswerverifiedShow Answer

The gene of an operon that codes for a protein repressor is called the

Correct AnswerverifiedC

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

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

Excised introns form structures called lariats.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is incorrect about termination codons?

Correct AnswerverifiedC

Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Repressible operons are normally turned on in the cell.

Correct AnswerverifiedTrue

Synthesis of a repressible enzyme is inhibited by

Correct AnswerverifiedShow Answer

Replication of DNA begins at an)

Correct AnswerverifiedShow Answer

A nucleosome is a linear chromosome wound around the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The expression of genetic traits is the

Correct AnswerverifiedShow Answer

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C

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True

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

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