Chp 8 Clicker Qs - Micro

Which of the following statements about plasmids is FALSE?

• Plasmids typically contain a small number of genes that are useful only in particular environments

• Plasmids may contain virulence genes that confer disease properties on the bacterium.

• Plasmids are essential for survival of the organism.

• Plasmids can be transferred horizontally from one bacterial cell to another.

u discover a mutation that causes the production of a truncated (shorter) nonfunctional protein “A.” What type of mutation is most likely?

• a nonsense mutation in protein “A”

• a missense mutation in protein “A”

• a missense mutation in RNA polymerase

• a nonsense mutation in RNA polymerase

• a silent mutation in protein “A”

The enzyme that synthesizes a second strand of nucleotides from an existing DNA strand is 

• DNA polymerase.

• reverse transcriptase.

• RNA polymerase.

• DNA ligase.

Bacteria can regulate gene expression at a variety of levels. Predict which level of control is the most drastic and difficult to reverse.

• changing the DNA sequence

• control of transcription

• posttranslational control

• translational control

Bacteria add _______ groups to recognize “old” DNA compared to new/newly acquired DNA.

Answer explanation