Exam 4: Bacteria and Archaea

You have found a mutant of Streptococcus pneumoniae that has lost the ability to produce a capsule.If you inject this strain into a population of healthy mice, what prediction can you make about the consequences?

A patient has a serious respiratory infection.A sputum sample yielded a bacterium that did not have any peptidoglycan.You hypothesize that the identity of this microbe could possibly be ______.

Spirochetes are able to move due to ______.

You have made a smear of a bacterial culture and have performed the Gram stain on it.Looking at the organism under the microscope, you notice that the cells do not seem to be the dark blue-purple of a gram-positive reaction, but instead are light purple.Your staining procedure was performed correctly.What is your best explanation as to why the bacteria have stained this way?

The short, numerous appendages used by some bacterial cells for adhering to surfaces are called ______.

The cell envelope of gram-positive bacteria has two layers: a thick cell wall and the cell membrane.

Which of the following bacteria is not closely related to the others?

All of the following occur during endospore germination except

The macromolecule containing alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) chains cross-linked by short peptide fragments is ______.

An irregular cluster of spherical bacterial cells is termed ______.

A nutrient binds to receptors near the flagellar basal body.This will result in

Which of the following is not a phenotypic trait of bacteria?

If you observe rod-shaped, pink cells on a slide that had just been Gram stained, you can assume that their cell envelope contains endotoxin. 2-20-13

Lysozyme is most effective against ______.

The reference for bacterial descriptions and classifications is _____ Manual of Systematic Bacteriology.

You've just isolated a new bacterium in pure culture, and you culture it on a general purpose medium where its cells have a rod-shape (bacillus) morphology.In addition to culturing it on solid media, you inoculate a slide to grow it as a biofilm.When you use confocal microscopy to image the biofilm, you observe that there are several cellular morphologies, ranging from coccus to coccobacillus to long bacillus.The best explanation for this observation is that

The division of microbes termed the Firmicutes have a cell wall type best described as ______.

Which of the following bacterial structures is incorrectly matched with a function?

Bacterial endospores are produced by ______.

The division of microbes termed the Mendosicutes have a cell wall type best described as ______.