EXAM 1 TEST QUESTIONS AND ANSWERS
1. Chapter 4 Multiple-Choice Question 16 Which of the following statements about gram-negative cell walls is FALS
Their Gram reaction is due to the outer membrane.
They are sensitive to penicillin.
They have an extra outer layer composed of lipoproteins, lipopolysaccharides, and
phospholipids.
They protect the cell in a hypotonic environment.
They are toxic to humans.
2. Chapter 3 Multiple-Choice Question 10 Simple staining is often necessary to improve contrast in which microsco
compound light
microscope
phase-contrast
microscope
fluorescence
microscope
electron microscope
darkfield microscope
3. Chapter 3 Multiple-Choice Question 5 Which of the following pairs is mismatched?
alcohol-acetone -
decolorizer
carbolfuchsin – basic dye
safranin – acid dye
iodine – mordant
,EXAM 1 TEST QUESTIONS AND ANSWERS
crystal violet – basic dye
4. Chapter 1 Multiple-Choice Question 10
The bacterial shape of the cells in the scanning electron micrograph shown in the figure would best be described as
columna
r.
ovoid.
coccus.
spiral.
bacillus.
5. Chapter 6 Multiple-Choice Question 16 Which of the following is an advantage of the direct microscopic count?
requires no incubation time
sample volume is unknown
,EXAM 1 TEST QUESTIONS AND ANSWERS
requires a large number of cells
can readily count organisms that are
motile
can easily distinguish live from dead
cells
6. Chapter 6 Multiple-Choice Question 3
Part complete
In the figure, which line shows the growth of an obligate aerobe incubated anaerobically?
a
b
c
, EXAM 1 TEST QUESTIONS AND ANSWERS
7. Chapter 4 Multiple-Choice Question 15 Bacteria are a commonly used organism for studies of genetic material i
laboratory. The nucleic acids must first be isolated from the cells for these studies. Which of the following would most
remove the cell wall from gram-positive bacterial cells prior to their lysis for nucleic acid isolation?
mycolic
acid
polymyxin
s
lysozyme
water
alcohol
8. Chapter 6 Multiple-Choice Question 21 Most bacteria grow best at pH
14
.
1.
7.
5.
9.
9. Chapter 3 Reading Question 8 When an object is viewed through a light microscope with oculars that magnify 20
objective lens that magnifies 100×, what is the total magnification of the object?
200
×
800
×
1. Chapter 4 Multiple-Choice Question 16 Which of the following statements about gram-negative cell walls is FALS
Their Gram reaction is due to the outer membrane.
They are sensitive to penicillin.
They have an extra outer layer composed of lipoproteins, lipopolysaccharides, and
phospholipids.
They protect the cell in a hypotonic environment.
They are toxic to humans.
2. Chapter 3 Multiple-Choice Question 10 Simple staining is often necessary to improve contrast in which microsco
compound light
microscope
phase-contrast
microscope
fluorescence
microscope
electron microscope
darkfield microscope
3. Chapter 3 Multiple-Choice Question 5 Which of the following pairs is mismatched?
alcohol-acetone -
decolorizer
carbolfuchsin – basic dye
safranin – acid dye
iodine – mordant
,EXAM 1 TEST QUESTIONS AND ANSWERS
crystal violet – basic dye
4. Chapter 1 Multiple-Choice Question 10
The bacterial shape of the cells in the scanning electron micrograph shown in the figure would best be described as
columna
r.
ovoid.
coccus.
spiral.
bacillus.
5. Chapter 6 Multiple-Choice Question 16 Which of the following is an advantage of the direct microscopic count?
requires no incubation time
sample volume is unknown
,EXAM 1 TEST QUESTIONS AND ANSWERS
requires a large number of cells
can readily count organisms that are
motile
can easily distinguish live from dead
cells
6. Chapter 6 Multiple-Choice Question 3
Part complete
In the figure, which line shows the growth of an obligate aerobe incubated anaerobically?
a
b
c
, EXAM 1 TEST QUESTIONS AND ANSWERS
7. Chapter 4 Multiple-Choice Question 15 Bacteria are a commonly used organism for studies of genetic material i
laboratory. The nucleic acids must first be isolated from the cells for these studies. Which of the following would most
remove the cell wall from gram-positive bacterial cells prior to their lysis for nucleic acid isolation?
mycolic
acid
polymyxin
s
lysozyme
water
alcohol
8. Chapter 6 Multiple-Choice Question 21 Most bacteria grow best at pH
14
.
1.
7.
5.
9.
9. Chapter 3 Reading Question 8 When an object is viewed through a light microscope with oculars that magnify 20
objective lens that magnifies 100×, what is the total magnification of the object?
200
×
800
×
