Microbiology Connect #3 Quiz

When analyzing the outer membrane of Gram-negative bacteria, which part of lipopolysaccharide induces an antibody response? A) lipid A B) teichoic acids C) core polysaccharides D) O antigen

D) O antigen

Which of the following processes can be used to bring nutrients into a cell against a concentration gradient? A) active transport and facilitated diffusion B) facilitated diffusion C) passive diffusion D) active transport

D) active transport

This structure contains only a thin layer of _______.

Peptidoglycan

The two layer cell wall of Gram-negative bacteria is separated from the plasma membrane by the _______.

Periplasmic space

The cell wall of Gram-negative bacterial cells is external to the _______.

Plasma membrane

Which of the following is a component of the outer membrane in Gram-negative bacteria that results in septic shock upon entering the bloodstream? A) lipopolysaccharide B) porin proteins C) teichoic acids D) peptidoglycan

A) lipopolysaccharide

In the Gram-positive bacterial cell wall, the tetrapeptides that extend from the peptidoglycan layers are linked by _______. A) peptide interbridges B) a direct peptide bond C) carbohydrate interbridges D) fatty acid interbridges

A) peptide interbridges

Which of the following is not true of bacterial plasmids? A) they are required for host growth and/or reproduction B) they can replicate independently of the chromosome C) they may carry genes that enhance survival of the bacterium under certain conditions D) they may carry genes for drug resistance

A) they are required for host growth and/or reproduction

The bacterial flagella moves _______. A) in a wave like fashion that is powered by ATP B) by rotation that is powered by the proton motive force C) in either a wave like fashion or rotation that is powered by the proton motive force D) in a wave like fashion that is powered by the proton motive force

B) by rotation that is powered by the proton motive force

The cytoplasmic membrane of bacteria A) acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others B) is the major site of ATP synthesis in aerobes C) all of the choices are correct D) retains the cytoplasm and its content

C) all of the choices are correct

You discover a new transport system used by a newly discovered bacterial species. The sugars that are transported using this system are phosphorylated as they enter the bacterial cell. You would describe this transport system as a(n) _______. A) micronutrient regulator B) passive diffusion C) group translocation D) facilitated diffusion

C) group translocation

Which statement about flagellar structure is TRUE? A) the basal body is a short curved segment B) the hook anchors the flagellum in the cell membrane and the filament extends out of the cell C) the filament extends out of the cell D) the hook anchors the flagellum in the cell membrane

C) the filament extends out of the cell

T/F: If you remove the peptidoglycan layer from a Gram-positive cell, it would still stain purple with a Gram stain.

False

T/F: The rotation of bacterial flagella is powered by ATP hydrolysis.

False

In addition, there is an ________ external to the Gram-negative bacterial peptidoglycan layer.

Outer membrane