Microbiology: Quiz 2 (Practice for Exam 1)

The peptide stem of mature peptidoglycan consists of four amino acids. Place the amino acids in the order in which they are added to NAM during synthesis.

First: L-Ala Second: D-Glu Third: DAP Fourth: D-Ala

When cells are placed into a hypertonic solution, the cytoplasma leaks out of the cell in a process known as ___________

Plasmolysis

When the flagella spin [ Select ] ["clockwise", "counterclockwise"] , bacteria move in a run. But when the flagella spin [ Select ] ["clockwise", "counterclockwise"] , bacteria move in a tumble.

1. Counterclockwise 2. Clockwise

As the flagella are assembled, they grow from the [ Select ] ["base", "tip"] , not the [ Select ] ["base", "tip"] .

1. Tip 2. Base

Archaea differ from Bacteria in a number of ways, select all those that apply: A. Histones associated with DNA B. 70S ribosome for protein translation C. Linkages between sugars in the cell wall D. The presence of plasmids

A and C

Archaea make cell walls that possess a structure similar to bacterial peptidoglycan called chitin. A. True B. False

B

Spirochetes stain positive in the Gram-staining procedure. A. True B. False

B

Which of the following secretion systems is responsible for transporting folded proteins across the plasma membrane? A. Type I B. Type III C. Tat D. Type V Sec

C

Which of the following structures of the flagellar motor is located within the outer membrane of Gram-negative bacteria? A. S ring B. P ring C. L ring D. M ring

C

During the synthesis of peptidoglycan, bactoprenol is important for which step(s)? A. Recycling the carrier UDP B. Adding the peptide stem to NAM C. Catalyzing the transpeptidation reaction to cross-link peptidoglycan strands D. Carrying the NAG-NAM-pentapeptide across the plasma membrane

D