Question 1

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

Question 2

Which is incorrect about inducible operons?

Accepted Answer

A)  they have genes turned off by a buildup of end product.
B)  they are often for catabolic pathways.
C)  they are normally turned off.
D)  they are turned on by the substrate of the enzyme.
E)  they include the lac operon.F) A) and B)
G) C) and D)

Question 3

Which of the following is incorrect about termination codons?

Accepted Answer

A)  they are also called nonsense codons
B)  where the bond between the final tRNA and the polymerase is broken
C)  they include AUG
D)  they include UAA, UAG, UGA
E)  they do not have corresponding tRNAF) A) and D)
G) A) and C)

Question 4

Lactose is a corepressor in the lac operon.

Accepted Answer

A) True 
 B)False

Question 5

Much of what was previously thought to be "junk" DNA has been found to have which purpose?

Accepted Answer

A)  It codes for antibiotic resistance proteins.
B)  It codes for repressor proteins.
C)  It codes for RNA regulatory molecules.
D)  It codes for repair enzymes to fix mutations.
E)  None of the choices are correct.F) B) and E)
G) B) and C)

Question 6

The enzymes that can proofread replicating DNA, detect incorrect bases, excise them, and correctly replace them are

Accepted Answer

A)  DNA ligases.
B)  DNA polymerases.
C)  DNA helicases.
D)  DNA gyrases.
E)  primases.F) A) and C)
G) C) and D)

Question 7

Base pairs in DNA are held together by _____ bonds.

Accepted Answer

hydrogen

Question 8

Which of the following is incorrect about transfer RNA?

Accepted Answer

A)  it has a bottom hairpin loop with an anticodon.
B)  an anticodon 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) None of the above
G) B) and D)

Question 9

The duplication of a cell's DNA is called

Accepted Answer

A)  mitosis.
B)  replication.
C)  transcription.
D)  translation.
E)  mutation.F) D) and E)
G) C) and D)

Question 10

Which is incorrect about purines?

Accepted Answer

A)  only found in DNA, not in RNA
B)  are nitrogenous bases
C)  always paired with a specific pyrimidine
D)  include adenine and guanine
E)  found within nucleotidesF) D) and E)
G) None of the above

Question 11

A nucleosome is a linear chromosome wound around the _____.

Accepted Answer

The answer of A nucleosome is a linear chromosome wound...

Question 12

Bacterial conjugation involves

Accepted Answer

A)  bacteriophage carrying donor DNA to the recipient cell.
B)  a donor cell with a plasmid and a pilus.
C)  naked DNA fragments from a lysed donor cell are taken up by a recipient cell.
D)  new progeny cells with genes from two parent bacterial cells.
E)  None of the choices are correct.F) A) and E)
G) B) and E)

Question 13

The on/off switch for transcription in the lactose operon is called the regulator.

Accepted Answer

A) True 
 B)False

Question 14

Discuss the interrelationship of DNA, RNA, and proteins in the cell.Explain the specific underlying cellular mechanisms of this relationship.

Accepted Answer

The interrelationship of DNA, RNA, and p...

Question 15

Each nucleotide is composed of one phosphate, one 5-carbon _____, and one _____ base.

Accepted Answer

sugar, nitrogenous

Question 16

In order for a retrovirus to insert itself into the host's DNA, it must do which of the following?

Accepted Answer

A)  DNA →DNA
B)  DNA →RNA
C)  RNA →RNA
D)  RNA →DNA
E)  RNA →proteinF) D) and E)
G) A) and B)

Question 17

The non-transcribed 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 B)
G) A) and C)

Question 18

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

Accepted Answer

The answer of Gene regulation can involve a protein repressor...

Question 19

All of the following pertain to RNA virus replication, except:

Accepted Answer

A)  positive-sense viruses first replicate a negative strand as a template.
B)  retroviruses synthesize DNA from their RNA genome.
C)  retroviruses carry reverse transcriptase into the host cell.
D)  negative-sense viruses directly undergo translation.
E)  All of the choices are correct.F) A) and B)
G) A) and C)

Question 20

Bacterial resistance to antimicrobial drugs is on the increase.Using your knowledge of microbial genetics, discuss at least 2 specific cell mechanisms that would allow development of antimicrobial resistance.

Accepted Answer

Bacterial resistance to antimicrobial dr...

Exam 9: Microbial Genetics

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

Correct AnswerverifiedC

Which is incorrect about inducible operons?

Correct AnswerverifiedShow Answer

Which of the following is incorrect about termination codons?

Correct AnswerverifiedShow Answer

Lactose is a corepressor in the lac operon.

Correct AnswerverifiedShow Answer

Much of what was previously thought to be "junk" DNA has been found to have which purpose?

Correct AnswerverifiedShow Answer

The enzymes that can proofread replicating DNA, detect incorrect bases, excise them, and correctly replace them are

Correct AnswerverifiedShow Answer

Base pairs in DNA are held together by _____ bonds.

Correct Answerverifiedhydrogen

Which of the following is incorrect about transfer RNA?

Correct AnswerverifiedShow Answer

The duplication of a cell's DNA is called

Correct AnswerverifiedShow Answer

Which is incorrect about purines?

Correct AnswerverifiedShow Answer

A nucleosome is a linear chromosome wound around the _____.

Correct AnswerverifiedShow Answer

Bacterial conjugation involves

Correct AnswerverifiedShow Answer

The on/off switch for transcription in the lactose operon is called the regulator.

Correct AnswerverifiedShow Answer

Discuss the interrelationship of DNA, RNA, and proteins in the cell.Explain the specific underlying cellular mechanisms of this relationship.

Correct AnswerAnswered by ExamLex AIThe interrelationship of DNA, RNA, and p...View AnswerShow Answer

Each nucleotide is composed of one phosphate, one 5-carbon _____, and one _____ base.

Correct Answerverifiedsugar, nitrogenous

In order for a retrovirus to insert itself into the host's DNA, it must do which of the following?

Correct AnswerverifiedShow Answer

The non-transcribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All of the following pertain to RNA virus replication, except:

Correct AnswerverifiedShow Answer

Bacterial resistance to antimicrobial drugs is on the increase.Using your knowledge of microbial genetics, discuss at least 2 specific cell mechanisms that would allow development of antimicrobial resistance.

Correct AnswerAnswered by ExamLex AIBacterial resistance to antimicrobial dr...View AnswerShow Answer

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hydrogen

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Answered by ExamLex AI
The interrelationship of DNA, RNA, and p...
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Each nucleotide is composed of one phosphate, one 5-carbon _, and one _ base.

Correct Answer
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sugar, nitrogenous

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Answered by ExamLex AI
Bacterial resistance to antimicrobial dr...
View Answer