MasteringMicrobiology Practice Questions

25 July 2022
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Okazaki fragments are formed because DNA replication....
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Is discontinuous on the lagging strand.
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Plasmids have been found in all of the following types of cells EXCEPT....
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Found in protozoan, prokaryotic, and fungal cells. Not found in animals cells.
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Bacteriophages are important for which of the following processes?
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Transduction
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When the cell is NOT in the presence of tryptophan...
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RNA polymerase can transcribe mRNA
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When is the repressor protein transcribed?
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It is always transcribed
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Why is the tryptophan operon turned off in the presence of tryptophan?
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Tryptophan binds to and activates the repressor proteins; the repressor proteins, in turn, bind to the operator, preventing transcription.
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What is the overall function of the trp operon?
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To ensure that the cell has a supply of tryptophan at all times.
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Transcription produces...
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mRNA, tRNA, and rRNA
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What brings amino acids to the ribosomes?
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tRNA
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What can be translated into protein?
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mRNA
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What is unique about transduction compared to normal bacteriophage infection?
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Transduction transfers DNA from the chromosome of one cell to another
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How is generalized transduction different from specialized transduction?
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Generalized transduction is initiated during lytic cycle of a virulent bacteriophage, transduction is initiated during the lysogenic cycle of a temperate bacteriophage.
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A transducing phage...
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Contains fragments of the host chromosome instead of the viral genome
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When a trasducing phage interact with a new host cell...
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The DNA from the previous host can recombine with the new host chromosome
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Competent cells are cells that...
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Can take up DNA from their surrounding environment and integrate it into chromosomes by recombination
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At which point does the recipient cell become and F+ cell?
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Formation of the complementary strand of the F factor
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What cellular macromolecule is the fertility factor comprised of?
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Nucleic acid
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What is the key difference between donor cells and recipient cells?
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An F plasmid
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What is required by an F- cell to become an F+ cell?
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F plasmid
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What is the function of the conjugation pilus?
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It pulls the F+ and F- cells together
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What is the basic function of the lac operon?
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To code for enzymes involved in catabolizing lactose
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Structural genes are...
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Transcribed into a single mRNA
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What operon is always transcribed unless deactivated?
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Repressible operons
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What operon is never transcribed unless activated?
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Inducible operons