NESTER'S MICROBIOLOGY-ACCESS
9th Edition
ISBN: 9781260518498
Author: Anderson
Publisher: MCG
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Chapter 5, Problem 1CT
This graph shows the time it takes to kill populations of the same microorganism under different conditions. What conditions would explain the differences in lines a, b, and c?
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Which statement among A-D is false regarding bacterial toxins?
A) O Hemolysıns are cell membrane disrupters that can rupture red blood cells.
B) O Second mesengar pathway disrupters like cholera toxin produces a debilitating respiratory condition of the lungs.
C) O Shiga toxin, tetanus toxin, and hemolysins are all types of exotoxins.
D) O Superantigens elicit a hyperactive response by the immune system and can lead to shock.
E) O None are false, A-D are all true statements.
Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
The R strain would be transformed into the virulent S strain and kill the host.
Neither the S nor the R strain would change.
The R strain would be transformed into the virulent S strain and not affect the host.
The S strain would be transformed into the nonvirulent R strain and not affect the host
The S strain would be transformed into the nonvirulent R strain and kill the host.
Strain X. spp. is a rod-shaped, anaerobic, Gram-positive bacterium with peritrichous flagella and pili that could use glucose and dye as its sole carbon source. Answer the following sections (a, b and c).
a) With a doubling time of 240 minutes and a starting population size of 10 bacteria cells. How many bacteria cells will be present after 72 hours, assuming no cell death?
b) Draw the diagram and describe motility required for the bacteria to gradient concentration of attractant (food)?
c) Draw the diagram of the up flow packed-bed column biofilm reactor under continuous operation and label completely
Chapter 5 Solutions
NESTER'S MICROBIOLOGY-ACCESS
Ch. 5 - How is preservation different from pasteurization?Ch. 5 -
2. What is the most chemically resistant...Ch. 5 - Explain why it takes longer to kill a population...Ch. 5 - What is the primary reason that wine is...Ch. 5 -
5. What is the primary reason that milk is...Ch. 5 - When canning, why are low-acid foods processed at...Ch. 5 - How are heat-sensitive liquids sterilized?Ch. 5 -
8. How does microwaving a food product kill...Ch. 5 -
9. How is an iodophore different from a tincture...Ch. 5 - Name two products commonly sterilized using...
Ch. 5 - Unlike a disinfectant, an antiseptic a) sanitizes...Ch. 5 - The D value is defined as the time it takes to...Ch. 5 - Prob. 3MCCh. 5 - Prob. 4MCCh. 5 - Which concentration of alcohol is the most...Ch. 5 - All of the following could be used to sterilize an...Ch. 5 - All of the following are routinely used to...Ch. 5 - Aseptically boxed juices and cream containers are...Ch. 5 - Commercial canning processes are designed to...Ch. 5 -
10. Which of the following is false?
a) A...Ch. 5 - An agriculture extension agent is preparing...Ch. 5 - As a microbiologist representing a food...Ch. 5 - This graph shows the time it takes to kill...Ch. 5 -
2. This diagram shows the filter paper method...
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