Question 1

In 1877, Robert Koch thought preparing permanently stained slides would be valuable. Why was his assessment correct?

Accepted Answer

In 1877, Robert Koch, a pioneering micro...

Question 2

What structure does light pass through after leaving the condenser in a compound light microscope?

Accepted Answer

A)   specimen
B)   illuminator
C)   objective lens
D)   ocular lensE) A) and C)
F) B) and C)

Question 3

Scanned probe microscopy is used to examine fine detail of molecular complexes, such as blood clots, or molecules, such as DNA.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following correctly traces the path of light through the compound microscope?

Accepted Answer

A)   light source; condenser; objective lens; specimen; ocular lens
B)   light source; condenser; specimen; objective lens; ocular lens
C)   condenser; light source; specimen; objective lens; ocular lens
D)   condenser; light source; specimen; ocular lens; objective lens
E)   light source; specimen; condenser; objective lens; ocular lensF) A) and C)
G) C) and D)

Question 5

What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?

Accepted Answer

A)   45x
B)   100x
C)   4.5x
D)   10x
E)   450xF) B) and D)
G) A) and D)

Question 6

Which of the following pairs is mismatched?

Accepted Answer

A)   confocal microscope -produces a three- dimensional image
B)   fluorescence microscope -uses a fluorescent light
C)   scanning electron microscope -produces a three- dimensional image
D)   darkfield microscope -uses visible light
E)   scanning tunneling microscope -allows visualization of atomsF) B) and E)
G) A) and E)

Question 7

A student is looking at a bacterial specimen using the oil immersion lens, but has forgotten to put immersion oil on the slide. The specimen will appear

Accepted Answer

A)   larger than it would if immersion oil was used.
B)   to have no color.
C)   the same as it would if the immersion oil was used.
D)   smaller than it would if immersion oil was used.
E)   somewhat fuzzy and have poor resolution.F) C) and E)
G) All of the above

Question 8

A microorganism measures 5 µm in length. Its length in mm would be

Accepted Answer

A)   50 mm.
B)   0.005 mm.
C)   0.5 mm.
D)   500 mm.
E)   0.05 mm.F) None of the above
G) C) and D)

Question 9

Which microscope achieves the highest magnification and greatest resolution?

Accepted Answer

A)   electron microscope
B)   darkfield microscope
C)   phase- contrast microscope
D)   compound light microscope
E)   fluorescence microscopeF) A) and B)
G) A) and C)

Question 10

You find colorless areas in cells in a gram- stained smear. What should you apply next?

Accepted Answer

A)   an acid- fast stain
B)   a flagella stain
C)   a capsule stain
D)   a simple stain
E)   an endospore stainF) A) and D)
G) D) and E)

Question 11

Which microscope is used to see intracellular detail in a living cell?

Accepted Answer

A)   atomic force microscope
B)   two- photon microscope
C)   brightfield microscope
D)   fluorescence microscope
E)   transmission electron microscopeF) A) and D)
G) B) and E)

Question 12

Which microscope is used to observe viruses and the internal structure of thinly sectioned cells?

Accepted Answer

A)   fluorescence microscope
B)   scanning electron microscope
C)   brightfield microscope
D)   transmission electron microscope
E)   darkfield microscopeF) B) and D)
G) A) and B)

Question 13

In 1884, Hans Christian Gram described a method of staining bacterial cells while not staining surrounding animal tissues. However, he thought that the staining method he developed was faulty because not all bacteria stained. In a letter to the editor of the journal in which Gram published his findings, write your response to Gram's concern.

Accepted Answer

Dear Hans Christian Gram,

I recently re...

Question 14

The capsules and flagella of bacteria can be observed in gram- stained smears.

Accepted Answer

A) True 
 B)False

Question 15

Bacterial smears are fixed before staining to

Accepted Answer

A)   make the cells visible.
B)   affix the cells to the slide.
C)   make their walls permeable.
D)   accept stain.E) B) and D)
F) All of the above

Question 16

The greater resolution of the electron microscope compared to the compound microscope is due to the longer wavelengths of the electrons used to examine specimens.

Accepted Answer

A) True 
 B)False

Question 17

Which microscope uses two beams of light to produce a three- dimensional color image?

Accepted Answer

A)   DIC microscope
B)   fluorescence microscope
C)   electron microscope
D)   phase- contrast microscope
E)   darkfield microscopeF) C) and D)
G) A) and C)

Question 18

Figure 3.1
 
-In Figure 3.1, line "c" points to the microscope's

Accepted Answer

A)   illuminator.
B)   ocular lens.
C)   objective lens.
D)   condenser.E) A) and C)
F) None of the above

Question 19

You are performing a Gram stain on gram- positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?

Accepted Answer

A)   colorless
B)   purple
C)   brown
D)   redE) C) and D)
F) A) and D)

Question 20

You are performing a Gram stain on gram- negative bacteria and you stop after the addition of the mordant. What is the appearance of the bacteria at this point?

Accepted Answer

A)   red
B)   purple
C)   brown
D)   colorlessE) A) and D)
F) A) and C)

Exam 3: Observing Microorganisms Through a Microscope

Correct Answer
Answered by ExamLex AI
Dear Hans Christian Gram,

I recently re...
View Answer

Which microscope achieves the highest magnification and greatest resolution?

Correct Answer
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Bacterial smears are fixed before staining to

Correct Answer
verified

You are performing a Gram stain on gram- positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?

Correct Answer
verified

You find colorless areas in cells in a gram- stained smear. What should you apply next?

Correct Answer
verified

Which microscope is used to see intracellular detail in a living cell?

Correct Answer
verified

You are performing a Gram stain on gram- negative bacteria and you stop after the addition of the mordant. What is the appearance of the bacteria at this point?

Correct Answer
verified

Which microscope uses two beams of light to produce a three- dimensional color image?

Correct Answer
verified

The greater resolution of the electron microscope compared to the compound microscope is due to the longer wavelengths of the electrons used to examine specimens.

Correct Answer
verified

In 1877, Robert Koch thought preparing permanently stained slides would be valuable. Why was his assessment correct?

Correct Answer
Answered by ExamLex AI
In 1877, Robert Koch, a pioneering micro...
View Answer

Figure 3.1 -In Figure 3.1, line "c" points to the microscope's

Correct Answer
verified

Which of the following correctly traces the path of light through the compound microscope?

Correct Answer
verified

What structure does light pass through after leaving the condenser in a compound light microscope?

Correct Answer
verified

A student is looking at a bacterial specimen using the oil immersion lens, but has forgotten to put immersion oil on the slide. The specimen will appear

Correct Answer
verified

Which microscope is used to observe viruses and the internal structure of thinly sectioned cells?

Correct Answer
verified

Scanned probe microscopy is used to examine fine detail of molecular complexes, such as blood clots, or molecules, such as DNA.

Correct Answer
verified

Which of the following pairs is mismatched?

Correct Answer
verified

What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?

Correct Answer
verified

A microorganism measures 5 µm in length. Its length in mm would be

Correct Answer
verified

The capsules and flagella of bacteria can be observed in gram- stained smears.

Correct Answer
verified

Exam 3: Observing Microorganisms Through a Microscope

Correct AnswerAnswered by ExamLex AIDear Hans Christian Gram,I recently re...View AnswerShow Answer

Which microscope achieves the highest magnification and greatest resolution?

Correct AnswerverifiedShow Answer

Bacterial smears are fixed before staining to

Correct AnswerverifiedShow Answer

You are performing a Gram stain on gram- positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?

Correct AnswerverifiedShow Answer

You find colorless areas in cells in a gram- stained smear. What should you apply next?

Correct AnswerverifiedShow Answer

Which microscope is used to see intracellular detail in a living cell?

Correct AnswerverifiedShow Answer

You are performing a Gram stain on gram- negative bacteria and you stop after the addition of the mordant. What is the appearance of the bacteria at this point?

Correct AnswerverifiedShow Answer

Which microscope uses two beams of light to produce a three- dimensional color image?

Correct AnswerverifiedShow Answer

The greater resolution of the electron microscope compared to the compound microscope is due to the longer wavelengths of the electrons used to examine specimens.

Correct AnswerverifiedShow Answer

In 1877, Robert Koch thought preparing permanently stained slides would be valuable. Why was his assessment correct?

Correct AnswerAnswered by ExamLex AIIn 1877, Robert Koch, a pioneering micro...View AnswerShow Answer

Figure 3.1 -In Figure 3.1, line "c" points to the microscope's

Correct AnswerverifiedShow Answer

Which of the following correctly traces the path of light through the compound microscope?

Correct AnswerverifiedShow Answer

What structure does light pass through after leaving the condenser in a compound light microscope?

Correct AnswerverifiedShow Answer

A student is looking at a bacterial specimen using the oil immersion lens, but has forgotten to put immersion oil on the slide. The specimen will appear

Correct AnswerverifiedShow Answer

Which microscope is used to observe viruses and the internal structure of thinly sectioned cells?

Correct AnswerverifiedShow Answer

Scanned probe microscopy is used to examine fine detail of molecular complexes, such as blood clots, or molecules, such as DNA.

Correct AnswerverifiedShow Answer

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?

Correct AnswerverifiedShow Answer

A microorganism measures 5 µm in length. Its length in mm would be

Correct AnswerverifiedShow Answer

The capsules and flagella of bacteria can be observed in gram- stained smears.

Correct AnswerverifiedShow Answer

Correct Answer
Answered by ExamLex AI
Dear Hans Christian Gram,

I recently re...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
Answered by ExamLex AI
In 1877, Robert Koch, a pioneering micro...
View Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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