Question 1

Each _____ is a specific segment of the DNA with the code for production of one functional product.

Accepted Answer

A)   intron
B)   exon
C)   gene
D)   operator
E)   tripletF) A) and D)
G) A) and B)

Question 2

Hfr transfer involves all of the following except

Accepted Answer

A)   gene integration into the bacterial chromosome.
B)   plid 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) A) and C)
G) A) and D)

Question 3

The analysis of the nitrogenous bases of the nucleic acid of a newly discovered virus showed 20% adenine, 40% guanine, 10% thymine, and 30% cytosine. The viral nucleic acid is most likely

Accepted Answer

A)   double-stranded DNA.
B)   double-stranded RNA.
C)   single-stranded RNA.
D)   single-stranded DNA.E) None of the above
F) B) and D)

Question 4

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

Accepted Answer

A)   point mutation.
B)   silent mutation.
C)   back mutation.
D)   missense mutation.
E)   nonsense mutation.F) A) and B)
G) A) and C)

Question 5

The different types of nucleic acids found in viruses include all of the following except

Accepted Answer

A)   double-stranded DNA.
B)   single-stranded DNA.
C)   double-stranded RNA.
D)   single-stranded RNA.
E)   There are no exceptions here. Each of these types may be found in viruses.F) C) and D)
G) A) and E)

Question 6

DNA polymerase III

Accepted Answer

A)   is needed for adding nucleotides during mRNA synthesis.
B)   synthesizes new DNA only in the 5'to 3'direction.
C)   cannot add nucleotides to the lagging strand.
D)   synthesizes an RNA primer.
E)   All of these choices are correct.F) C) and D)
G) A) and C)

Question 7

In bacteria, initiator tRNA carries formyl methionine.

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

Transcription occurs in the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False

Question 10

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

Question 11

What molecule is synthesized as a copy of a gene from the DNA template strand?

Accepted Answer

A)   ribosomal RNA
B)   messenger RNA
C)   transfer RNA
D)   primer RNA
E)   ribozymesF) None of the above
G) B) and D)

Question 12

In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated Streptococci were converted into smooth encapsulated Streptococci in the presence of the heat-killed smooth encapsulated Streptococci. What is the term that describes this process?

Accepted Answer

A)   transduction
B)   conjugation
C)   transformation
D)   cloningE) B) and C)
F) A) and C)

Question 13

Synthesis of an inducible enzyme requires

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) A) and D)
F) None of the above

Question 14

Base pairs in DNA are held together by _____ bonds.

Accepted Answer

A)   peptide
B)   nonpolar covalent
C)   polar covalent
D)   hydrogen
E)   sulfhydrylF) B) and D)
G) D) and E)

Question 15

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

Accepted Answer

A)   The genotype is inherited.
B)   The genotype is made up of structural genes coding for proteins.
C)   The genotype includes genes coding for RNA.
D)   The genotype includes regulatory genes controlling gene expression.
E)   The genotype includes the expressed traits governed by the genes.F) A) and E)
G) B) and C)

Question 16

Which of the following is not true of the prokaryotic ribosome?

Accepted Answer

A)   Prokaryotic ribosomes are 70S.
B)   A prokaryotic ribosome has a peptide P)  site.
C)   A prokaryotic ribosome has an exit 
E)   site.
D)   The small subunit provides the enzymes for making peptide bonds.
E)   The prokaryotic ribosome has an amino acyl 
A)   site.F) A) and B)
G) None of the above

Question 17

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

Question 18

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) None of the above

Question 19

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 B)
G) A) and C)

Question 20

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

Exam 9: Microbial Genetics

The analysis of the nitrogenous bases of the nucleic acid of a newly discovered virus showed 20% adenine, 40% guanine, 10% thymine, and 30% cytosine. The viral nucleic acid is most likely

Correct AnswerverifiedShow Answer

DNA polymerase III

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Transcription occurs in the nucleus or at the nucleoid.

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

Which of the following is not true of conjugation?

Correct AnswerverifiedShow Answer

Synthesis of an inducible enzyme requires

Correct AnswerverifiedShow Answer

Base pairs in DNA are held together by _____ bonds.

Correct AnswerverifiedShow Answer

In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated Streptococci were converted into smooth encapsulated Streptococci in the presence of the heat-killed smooth encapsulated Streptococci. What is the term that describes this process?

Correct AnswerverifiedShow Answer

Short interfering RNAs affect gene expression in eukaryotes by

Correct AnswerverifiedShow Answer

Each _____ is a specific segment of the DNA with the code for production of one functional product.

Correct AnswerverifiedShow Answer

Hfr transfer involves all of the following except

Correct AnswerverifiedShow Answer

Each nucleotide is composed of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The different types of nucleic acids found in viruses include all of the following except

Correct AnswerverifiedShow Answer

What molecule is synthesized as a copy of a gene from the DNA template strand?

Correct AnswerverifiedShow Answer

Which of the following is not true of the prokaryotic ribosome?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In bacteria, initiator tRNA carries formyl methionine.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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