Question 16 pts Which of the following statements is/are true concerning bacteri
ID: 93210 • Letter: Q
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Question 16 pts
Which of the following statements is/are true concerning bacteria? Check any/all that apply.
It is necessary to stain bacteria because they are colorless and invisible under a light microscope.
Heat fixation kills bacteria and makes them adhere to the slide.
Scientists only use one stain when staining bacteria.
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Question 22 pts
What is the term for spherical or circular bacteria?
coccus
bacillus
spirochete
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Question 32 pts
What is the term for rod-shaped bacteria?
coccus
bacillus
spirochete
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Question 45 pts
Which of the following are possible arrangements of bacteria (as seen under a microscope)? Check any/all that apply.
clumps
chains
tetrads
dispersed individually
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Question 57 pts
What characteristic does the Gram method use to distinguish between Gram-positive and Gram-negative bacteria?
size of bacteria
shape of bacteria
arrangement of bacteria
composition of cell walls
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Question 65 pts
__________have thin cell walls that allow ethanol to wash out the dye-iodine complexes.
Gram-positive bacteria
Gram-negative bacteria
both Gram-positive and Gram-negative bacteria
No answer text provided.
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Question 75 pts
With__________, counterstain makes the invisible bacteria pink.
Gram-positive bacteria
Gram-negative bacteria
both Gram-positive and Gram-negative bacteria
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Question 85 pts
__________have thick cell walls with a high percentage of peptidoglycan.
Gram-positive bacteria
Gram-negative bacteria
both Gram-positive and Gram-negative bacteria
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Question 94 pts
__________retain the primary purple stain.
Gram-positive bacteria
Gram-negative bacteria
both Gram-positive and Gram-negative bacteria
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Question 104 pts
For the Gram stain method, what is the primary stain?
crystal violet
ethanol
safranin
Brilliant Green
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Question 114 pts
For the Gram stain method, what is the decolorizer?
crystal violet
ethanol
safranin
Malachite green
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Question 124 pts
For the Gram stain method, what is the counter-stain?
crystal violet
iodine
ethanol
safranin
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Question 138 pts
Refer to the Staphylococcus aureus picture on the LAB MODULE THREE - STUDY HELP document.
Choose the correct statements about S. aureus.
The species is Gram-positive.
The species is Gram-negative.
The bacteria are spherical (circular).
The bacteria are rod-shaped.
The bacteria are spiral-shaped.
The bacteria are arranged in clumps.
The bacteria are arranged in chains.
The bacteria are in groups of four.
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Question 148 pts
Refer to the Escherichia coli picture on the LAB MODULE THREE - STUDY HELP document.
Choose the correct statements about E. coli.
The species is Gram-positive.
The species is Gram-negative.
The bacteria are spherical (circular).
The bacteria are rod-shaped.
The bacteria are spiral-shaped.
The bacteria are arranged in clumps.
The bacteria are arranged in groups of four.
The bacteria are dispersed individually.
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Question 152 pts
For the Acid-Fast stain method, what is the primary stain?
crystal violet
acid alcohol
Kinyoun carbolfuchsin
Brilliant Green
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Question 162 pts
For the Acid-Fast stain method, what is the decolorizer?
Kinyoun carbolfuchsin
acid alcohol
Brilliant Green
safranin
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Question 172 pts
For the Acid-Fast stain method, what is the counter-stain?
Kinyoun carbolfuchsin
acid alcohol
Brilliant Green
safranin
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Question 188 pts
Which of the following statements is/are true concerning Acid-Fast staining? Choose any/all that apply.
Acid-fast bacteria cannot be identified by Gram staining because their waxy cell walls repel Gram staining.
When preparing microscope slides of acid-fast bacteria, scientists use serum to help cells adhere to the slide.
Acid-fast positive bacteria look pinkish purple under the microscope (after the staining procedures).
Acid-fast negative bacteria have no color under the microscope (after the staining procedures).
The bacterium responsible for tuberculosis is acid-fast positive.
The bacterium responsible for leprosy is acid-fast negative.
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Question 191 pts
For the endospore staining method, what is the primary stain?
crystal violet
safranin
iodine
Malachite green
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Question 208 pts
Which of the following statements is/are true concerning endospores? Choose any/all that apply.
Most bacterial species produce endospores.
Spore-producing bacteria produce endospores in response to stress (e.g., lack of nutrients).
Endospores are more durable than active bacteria.
The bacterial species that causes anthrax produces spores.
A scientist must steam a microscope slide in order to force the primary stain into the spores.
Scientists have to observe cultures grown for different lengths of time (e.g., after two days, again after five days) so that they can observe endospores within bacteria and released endospores.
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Question 218 pts
Which of the following statements is/are true concerning capsule staining? Choose any/all that apply.
Capsules are found outside the cell wall of some species of bacteria.
Capsules are made of mucous and repel aqueous stains.
During capsule staining, the capsule resists staining and appears as a white ring around the cell.
Heat can cause bacteria to shrink and may make bacteria appear to have a capsule when they do not.
Heat can shrink capsules and make them more difficult to detect.
Capsules make it harder for bacteria to adhere to surfaces.
The capsule prevents phagocytosis of the bacterium.
Capsules decrease the ability of bacteria to cause disease.
Explanation / Answer
1)Term for spherical or circular bacteria is coccus
2) Term for rod shaped bacteria is bacillus
3) Bacteria can be arranged in clumps, chains,tetrads and dispersed individually.
4) Composition of cell wall is used to distinguish gram positive and Gram negative bacteria
5) Gram negative bacteria have thin cell walls that allow ethanol to wash out the dye-iodine complex