CFU Chp 4

Question 1

The capsule is a virulence factor that contributes to the disease-causing properties of the causative agent of anthrax, Bacillus anthracis. Which statement best explains this observation?

Answer 1

Prokaryotes do not possess DNA.

Question 2

https://plus.pearson.com/epub/bronte/BRNT-N2NRDDOJN2/v21/OPS/images/138e7168b83f1f4004c482b3be3c3663.jpeg

A blood culture from a patient suspected of having anthrax returns the following result. What term best describes the shape and arrangement of the bacteria pictured?

Answer 2

streptobacilli
~ These rod-shaped bacteria remain attached after dividing along a single plane, forming chains. The streptobacilli shape and arrangement confirms the presence of Bacillus anthracis in the patient sample.

Question 3

The capsule is a virulence factor that contributes to the disease-causing properties of the causative agent of anthrax, Bacillus anthracis. Which statement best explains this observation?

Answer 3

The capsule allows the bacterium to escape phagocytosis by cells of the host immune system. An organized glycocalyx, called the capsule, prevents phagocytosis and allows the bacterial pathogen to persist within the host.

Question 4

The ability of bacteria to move towards an attractant or away from a repellent is mediated by which bacterial structure?

Answer 4

flagella

Flagella are long filamentous appendages that propel bacteria. This motility permits flagellated-bacteria to respond to their environment.