41 which of the following is not useful for observing

41) Which of the following is NOT useful for observing living cells? 41)
A) phase - contrast microscope
B) scanning electron microscope
C) scanning acoustic microscope
D) darkfield microscope
E) brightfield microscope
Answer: B
Explanation: A)
B)
C)
D)
E)
42) Which microscope uses visible light? 42)
Explanation: A)
B)
C)
D)
E)
43) Which microscope is used to observe viruses and the internal structure of thinly sectioned cells? 43)
Explanation: A)
B)
C)
D)
E)
44) Which of the following pairs is mismatched? 44)
Explanation: A)
B)
C)
D)
E)
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45) 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
45)
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.
Answer: E
Explanation: A)
B)
C)
D)
E)
TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.
46) Both phase - contrast microscopy and differential interference contrast microscopy are used to
view the internal structures of cells without staining.
Answer:
46)
Explanation:
47) The limit of resolution of the compound microscope illuminated with visible light is approximately
0.2 μm.
Answer:
47)
Explanation:
48) The counterstain used in the Gram stain is a basic dye. 48)
Answer: True False
Explanation:
49) If acid - fast bacteria are stained with the Gram stain, they will stain gram - negative. 49)
Answer: True False
Explanation:
50) The capsules and flagella of bacteria can be observed in gram - stained smears. 50)
Explanation:
51) In a completed Gram stain, gram - negative bacteria are colorless. 51)
Answer: True False
Explanation:
52) Cells viewed in darkfield microscopy appear similar to those stained with the negative stain. 52)
Answer: True False
Explanation:
53) In a completed Gram stain, gram - positive bacteria are purple. 53)
Answer: True False
Explanation:
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54) 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.
54)
Answer: True False
Explanation:
55) Scanned probe microscopy is used to examine fine detail of molecular complexes, such as blood
clots, or molecules, such as DNA.