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CH. 7 Mastering Microbiology

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Aug 22nd, 2023
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21 test answers
question
Which of the following enzymes is responsible for unzipping a DNA molecule in preparation for its replication? a. DNA polymerase b. DNA ligase c. DNA helicased. primase
answer
c.
question
Which of the following statements is NOT accurate about microbial DNA? a. Archaea and eukaryotes have histone proteins associated with their DNA, while bacteria do not have histones. b. The chromosomes and plasmids in bacteria, archaea, and eukaryotes contain double-stranded DNA. c. All of the DNA in eukaryotic cells is contained within a nucleus. d. Most bacteria and archaea have circular DNA in the cytoplasm, while most eukaryotes have linear DNA in the nucleus.
answer
c.
question
Okazaki fragments are formed because DNA replication ____. a. is performed by different versions of DNA polymerase in different cells b. is discontinuous on the lagging strand c. involves proofreading d. is semiconservative
answer
b.
question
Plasmids have been found in all of the following types of cells EXCEPT _____. a. animal cells b. fungal cells c. protozoan cells d. prokaryotic cells
answer
a.
question
Which of the following characteristics of a chromosome would identify it as a prokaryotic chromosome rather than a eukaryotic chromosome? a. it contains histones b. it contains A, C, G, and T c. it is a circular molecule d. it contains double-stranded DNA
answer
c.
question
Which of the following must occur to enable the transcription of genes in the lactose operon? a. the inducer must bind the operator b. the inducer must bind to the repressor c. the repressor must bind to the operator d. the inducer must bind RNA polymerase
answer
b.
question
Which of these is NOT a difference between eukaryotic and bacterial gene expression? a. Eukaryotic RNA is modified prior to translation, whereas bacterial RNA is not. b. Initiation of translation in bacteria occurs when the ribosomal subunit binds to the 5' guanine cap, while in eukaryotes it binds to a specific nucleotide sequencec. bateria must have genes organized and regulated within operons, while eukaryotes lack operons d. bacteria have 70S ribosomes, while eukaryotes have 80S ribosomes in their cytoplasm
answer
b.
question
In a repressible operon, which of the following must occur to enable gene expression? a. the corepressor must be absent b. the repressor must bind to the operator c. the inducer must bind to the repressord. the corepressor must bind to the repressor
answer
a.
question
The process of making a complementary copy of DNA into the form of RNA is called ____. a. transformation b. transcription c. translation d. transduction
answer
b.
question
Which of the following types of mutations creates a stop codon where one did not exist before? a. missense mutation b. frameshift mutation c. nonsense mutation d. silent mutation
answer
c.
question
Insertions and deletions usually lead to which of the following types of mutations? a. pyrimidine dimersb. silent mutationsc. frameshift mutations d. base-substitution mutations
answer
c.
question
Base-excision repair is a DNA repair mechanism designed to cope with which of the following types of problems in a cell? a. chromosome breaks b. damage from UV light c. damage from mutagenic chemicals d. incorrect nucleotide incorporation
answer
d.
question
Which of the following is capable of conjugation? a. F+ and Hfr cells b. F+ cells c. bacteriophagesd. F-cells
answer
a.
question
Bacteriophages are important for which of the following processes? a. transformation b. transduction c. transcription d. translation
answer
b.
question
Which of the following events occurs during transcription? a. mRNA binds to a ribosome in the cytoplasm b. A cap is added to the RNA molecule c. A molecule of RNA is formed based on the sequence of nucleotides in DNA d. The message in mRNA is translated into a protein e. Those segments of the RNA strand that do not actually code for the protein are removed
answer
c.
question
Which of the following is a correct statement about mRNA? a. mRNA includes a cap that consists of extra adenine nucleotidesb. mRNA binds directly to amino acids during translation c. mRNA moves from nucleus to the cytoplasm following RNA processing d. mRNA is transcribed from DNA in the cytoplasm e. Segments of mRNA that code for protein are removed before translation
answer
c.
question
The site of translation is a. the Golgi apparatus b. ribosomes in the cell nucleus c. the cell nucleus d. the plasma membrane e. ribosomes in the cell cytoplasm
answer
e.
question
Which one of the following does not play a role in translation? a. anticodonb. ribosomes c. amino acids d. DNA e. tRNA
answer
d.
question
Which of the following does not occur during RNA processing? a. Adenine nucleotides are added to the end of the RNA strand, forming a tail b. mRNA attaches to the small subunit of a ribosome c. Segments of RNA that do code for the protein are reconnected d. a modified guanine nucleotide is added to the beginning of the RNA strand as a cap e. segments of the RNA strand that do not actually code for the protein are removed
answer
b.
question
Which of the following regions of a ribosome holds the growing polypeptide? a. the E site b. the P site c. the A site d. the Z site
answer
b.
question
A mutation that causes production of a defective pilus in a bacterium will prevent _____. a. translation b. transformation c. transduction d. conjugation
answer
d
1 of 21
question
Which of the following enzymes is responsible for unzipping a DNA molecule in preparation for its replication? a. DNA polymerase b. DNA ligase c. DNA helicased. primase
answer
c.
question
Which of the following statements is NOT accurate about microbial DNA? a. Archaea and eukaryotes have histone proteins associated with their DNA, while bacteria do not have histones. b. The chromosomes and plasmids in bacteria, archaea, and eukaryotes contain double-stranded DNA. c. All of the DNA in eukaryotic cells is contained within a nucleus. d. Most bacteria and archaea have circular DNA in the cytoplasm, while most eukaryotes have linear DNA in the nucleus.
answer
c.
question
Okazaki fragments are formed because DNA replication ____. a. is performed by different versions of DNA polymerase in different cells b. is discontinuous on the lagging strand c. involves proofreading d. is semiconservative
answer
b.
question
Plasmids have been found in all of the following types of cells EXCEPT _____. a. animal cells b. fungal cells c. protozoan cells d. prokaryotic cells
answer
a.
question
Which of the following characteristics of a chromosome would identify it as a prokaryotic chromosome rather than a eukaryotic chromosome? a. it contains histones b. it contains A, C, G, and T c. it is a circular molecule d. it contains double-stranded DNA
answer
c.
question
Which of the following must occur to enable the transcription of genes in the lactose operon? a. the inducer must bind the operator b. the inducer must bind to the repressor c. the repressor must bind to the operator d. the inducer must bind RNA polymerase
answer
b.
question
Which of these is NOT a difference between eukaryotic and bacterial gene expression? a. Eukaryotic RNA is modified prior to translation, whereas bacterial RNA is not. b. Initiation of translation in bacteria occurs when the ribosomal subunit binds to the 5' guanine cap, while in eukaryotes it binds to a specific nucleotide sequencec. bateria must have genes organized and regulated within operons, while eukaryotes lack operons d. bacteria have 70S ribosomes, while eukaryotes have 80S ribosomes in their cytoplasm
answer
b.
question
In a repressible operon, which of the following must occur to enable gene expression? a. the corepressor must be absent b. the repressor must bind to the operator c. the inducer must bind to the repressord. the corepressor must bind to the repressor
answer
a.
question
The process of making a complementary copy of DNA into the form of RNA is called ____. a. transformation b. transcription c. translation d. transduction
answer
b.
question
Which of the following types of mutations creates a stop codon where one did not exist before? a. missense mutation b. frameshift mutation c. nonsense mutation d. silent mutation
answer
c.
question
Insertions and deletions usually lead to which of the following types of mutations? a. pyrimidine dimersb. silent mutationsc. frameshift mutations d. base-substitution mutations
answer
c.
question
Base-excision repair is a DNA repair mechanism designed to cope with which of the following types of problems in a cell? a. chromosome breaks b. damage from UV light c. damage from mutagenic chemicals d. incorrect nucleotide incorporation
answer
d.
question
Which of the following is capable of conjugation? a. F+ and Hfr cells b. F+ cells c. bacteriophagesd. F-cells
answer
a.
question
Bacteriophages are important for which of the following processes? a. transformation b. transduction c. transcription d. translation
answer
b.
question
Which of the following events occurs during transcription? a. mRNA binds to a ribosome in the cytoplasm b. A cap is added to the RNA molecule c. A molecule of RNA is formed based on the sequence of nucleotides in DNA d. The message in mRNA is translated into a protein e. Those segments of the RNA strand that do not actually code for the protein are removed
answer
c.
question
Which of the following is a correct statement about mRNA? a. mRNA includes a cap that consists of extra adenine nucleotidesb. mRNA binds directly to amino acids during translation c. mRNA moves from nucleus to the cytoplasm following RNA processing d. mRNA is transcribed from DNA in the cytoplasm e. Segments of mRNA that code for protein are removed before translation
answer
c.
question
The site of translation is a. the Golgi apparatus b. ribosomes in the cell nucleus c. the cell nucleus d. the plasma membrane e. ribosomes in the cell cytoplasm
answer
e.
question
Which one of the following does not play a role in translation? a. anticodonb. ribosomes c. amino acids d. DNA e. tRNA
answer
d.
question
Which of the following does not occur during RNA processing? a. Adenine nucleotides are added to the end of the RNA strand, forming a tail b. mRNA attaches to the small subunit of a ribosome c. Segments of RNA that do code for the protein are reconnected d. a modified guanine nucleotide is added to the beginning of the RNA strand as a cap e. segments of the RNA strand that do not actually code for the protein are removed
answer
b.
question
Which of the following regions of a ribosome holds the growing polypeptide? a. the E site b. the P site c. the A site d. the Z site
answer
b.
question
A mutation that causes production of a defective pilus in a bacterium will prevent _____. a. translation b. transformation c. transduction d. conjugation
answer
d