Download Lab Part 1: Culturing and Isolating Bacteria

Lab Part 1: Culturing and Isolating Bacteria
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. It is important to distinguish between Gram-positive and Gram-negative bacteria in diagnosing a
bacterial infection because
a. Gram-negative and Gram-positive bacteria differ in their response to different
antibiotics.
b. Gram-positive bacteria never cause fatal diseases.
c. Gram-positive bacteria destroy antibiotics, preventing them from working.
d. Gram-positive bacteria do not respond to many antibiotics.
2. The chromosomes of bacteria
a. contain numerous types of organelles.
b. are divided into compartments.
c. vary in number, depending on the species of bacteria.
d. contain a single circular piece of DNA.
3. Structures found in eukaryotic cells but not in a bacterial cells are
a. nuclei.
c. membrane-bound organelles.
b. linear chromosomes.
d. All of the above
4. Refer to the illustration above. Which of the diagrams has a shape like the Bacillus bacterial
genus?
a. Organism A
c. Organism C
b. Organism B
d. None of the above
5. Refer to the illustration above. The shape represented by Organism A applies to the bacterial genus
a. Streptococcus, which causes strep throat.
b. Leptospira, which can cause urinary tract infections in humans.
c. Bacillus, which produces antibiotics.
d. Penicillium, which produces penicillin.
6. Refer to the illustration above. The shape represented by Organism C is called
a. coccus.
c. bacillus.
b. spirillum.
d. filamentous.
7. Which of the following might be found in the cytoplasm of a bacterial cell?
a. chloroplasts
c. mitochondria
b. Golgi bodies
d. None of the above
8. Bacterial cells have
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a. a cell wall only.
b. a cell membrane only.
c. both a cell membrane and an outer cell wall.
d. a cell wall inside their cell membrane.
Bacteria can be classified according to their
a. type of cell walls.
c. Gram-staining characteristics.
b. methods of obtaining energy.
d. All of the above
Nitrogen-fixing bacteria
a. repair nitrogen-damaged legume roots.
b. damage the environment by using atmospheric oxygen to produce toxic nitrogen
compounds.
c. convert atmospheric nitrogen into ammonia.
d. convert ammonia in the soil into nitrogen gas.
Cell organelles that Escherichia coli and other bacteria have in common with eukaryotes are
a. chloroplasts.
c. nuclei.
b. mitochondria.
d. ribosomes.
Bacterial cells such as Escherichia coli transfer pieces of genetic material in a process called
a. binary fission.
c. conjugation.
b. mitosis.
d. sexual reproduction.
Escherichia coli is an example of a bacterium that has short, thin, hairlike projections called
a. pili.
c. cocci.
b. cilia.
d. ribosomes.
Antibiotics
a. include penicillin, tetracycline, and streptomycin.
b. may prevent bacteria from making new cell walls.
c. are effective treatments for bacterial diseases.
d. All of the above
Cholera is usually transmitted by
a. insects.
c. contaminated water.
b. sexual contact.
d. airborne water droplets.
A bacterial disease carried from rodents to humans by fleas is
a. tuberculosis.
c. cholera.
b. bubonic plague.
d. Lyme disease.
Completion
Complete each sentence or statement.
17. Spiral bacteria are called ____________________.
18. Round bacteria are called ____________________.
19. Rod-shaped bacteria are called ____________________.
20. A species of bacteria that lives in the intestines of many mammals is ____________________
____________________.
21. The process in which ammonia is oxidized into nitrate, a form of nitrogen commonly used by
plants, is called ____________________.
22. A(n) ____________________ is a substance that can be obtained from bacteria or fungi and can be
used as a drug to fight pathogenic bacteria.
Lab Part 1: Culturing and Isolating Bacteria
Answer Section
MULTIPLE CHOICE
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D
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A
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C
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C
A
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C
B
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COMPLETION
17. ANS: spirilli
DIF: II
18. ANS: cocci
OBJ: 20.2.1
DIF: II
19. ANS: bacilli
OBJ: 20.2.1
DIF: II
OBJ: 20.2.1
20. ANS: Escherichia coli
DIF: II
21. ANS: nitrification
OBJ: 20.2.3
DIF: II
22. ANS: antibiotic
OBJ: 20.2.3
DIF:
I
OBJ: 20.2.4
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20.2.1
20.2.1
20.2.1
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20.2.1
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20.2.1
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20.2.4