Project #47212 - Questions

Unit 3 Bacteria (25 points)

 Read carefully and answer the questions.  you are expected to do your own work and for the short answer questions write the answers using your own words. 

Part A. Multiple Choice and Fill in the Blank (1 point each)

1. Which of the following is an advantage of the human microbiota?

a. It can aid in food digestion.

b. It can inhibit the growth of pathogenic microbes.

c. It can aid in biosynthesis.

d. It can aid in nutrient absorption.

e. All of these

2. Which of the following is present in Gram-positive bacteria but not in gram-negative bacteria?

a. Peptidoglycan

b. Capsule

c. Flagella

d. Lipoteichoic acid

e. Pili

3. Clostridium tetani and Bacillus cereus are both examples of 

a. Gram-negative rods.

b. Normal microflora of the human body.

c. Non-spore forming gram-positive bacilli.

d. Spore-forming gram-positive bacilli.

4. A plasmid 

a. An extrachromosomal piece of DNA that might confer a selective advantage to a microbe.

b. A chromosomal site to which genetic activity can be traced.

c. A molecule that carries the genetic message of the chromosomal DNA.

d. A cytoplasmic structure that transfers an amino acid to mRNA. 

5. _________________________ are the smallest bacteria, lack a cell wall, and contain sterols in their plasma membrane.

6. ____________, ___________, ________ are three types of exotoxins produced by bacterial cells that may damage or inhibit host cell function.

Part B. Short Answers 

Answer the questions below as completely and as thoroughly as possible and where appropriate include a specific example to illustrate. Answer the questions in essay form (not as an outline or bullets) using complete sentences. You may use a diagram or table to supplement your answers, but a diagram or table alone without appropriate discussion will not be adequate for full credit. Reminder: All answers are to written in your own words.

7. (4points) Name and briefly describe four mechanisms by which antibiotic susceptible bacteria can acquire genes resistance to antibiotics. 

8. (4 points) What is an endospore, and what is its function for a bacterial cell? Name at least two infections transmitted to humans by bacterial endospores and the bacteria (genus and species names) that cause them.

9. (3 points) List three different mechanisms by which antibiotics are effective against bacterial infections and give an example of an antibiotic for each of the mechanisms.

10.  (2 points) Describe three ways that you, personally, can help prevent the spread and/or development of antibiotic-resistant infections.

11. (4 points) Gram stain investigation: copy your answers to the Gram stain investigation lab. 

a. What were your results?
b. Describe two ways the food(s) could have become contaminated.
c. Name two ways contamination could have been avoided.
d. Did you find any microorganism known not to cause food poisoning? What? 
e. In what ways does Gram staining aide in the identification of unknown bacteria? 
f. If you forgot to add the iodine, would the Gram-positive bacteria still be purple at the end of the staining procedure? Explain why or why not.

12.  (2 points) Control slides are missing in The Gram Stain Investigation. What are they and what is their importance?

Subject Science
Due By (Pacific Time) 11/15/2014 12:00 am
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