Question 1

Which of the following is INCORRECT?

Accepted Answer

A)  Congo red is a negative stain. 
B)  Malachite green is an acid-fast stain. 
C)  Methylene blue is a simple stain. 
D)  Fluorophore is in an antibody stain.

Question 2

Which of the following is mismatched?

Accepted Answer

A)  darkfield microscopy-uses visible light 
B)  fluorescence microscopy-uses a fluorescent light 
C)  scanning electron microscopy-produces a three-dimensional image 
D)  compound light microscopy-produces a light image against a dark background

Question 3

Using the figure below,which of the following images depicts the refraction of light?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4

Question 4

In the figure below,line "B" points to the microscope's

Accepted Answer

A)  ocular lens. 
B)  objective. 
C)  condenser. 
D)  light source.

Question 5

In the Gram stain,which step is critical in differentiating Gram-positive from Gram-negative cells?

Accepted Answer

A)  crystal violet 
B)  safranin 
C)  mordant 
D)  ethanol

Question 6

Which microscope best allows the observation of internal cell structures in a natural state?

Accepted Answer

A)  compound light microscope 
B)  phase-contrast microscope 
C)  darkfield microscope 
D)  electron microscope

Question 7

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

Accepted Answer

A)  purple 
B)  colorless 
C)  pink 
D)  blue

Question 8

Please label the figure below with different interactions of light with matter.Please describe what is happening with each interaction.

Accepted Answer

The answer of Please label the figure below with different...

Question 9

Which of the following is powerful enough to visualize ribosomes?

Accepted Answer

A)  a compound light microscope 
B)  an electron microscope 
C)  a fluorescence microscope 
D)  a darkfield microscope

Question 10

Assume you stain Bacillus with malachite green with heat and then counterstain with safranin.What type of stain would you be performing?

Accepted Answer

A)  a differential and endospore stain 
B)  a differential and Gram stain 
C)  a simple and endospore stain 
D)  a simple and Gram stain

Question 11

Assume you stain Bacillus with malachite green with heat and then counterstain with safranin.Through the microscope,the green structures are

Accepted Answer

A)  cell walls. 
B)  capsules. 
C)  endospores. 
D)  bacteria.

Question 12

Which microscope is used to observe specific fluorescent-labeled structures?

Accepted Answer

A)  a compound light microscope 
B)  a phase-contrast microscope 
C)  a fluorescence microscope 
D)  an electron microscope

Question 13

Which of the following statements is correct?

Accepted Answer

A)  Safranin is a primary stain. 
B)  Iodine is a counterstain. 
C)  Ethanol is a decolorizer. 
D)  Crystal violet is a mordant.

Question 14

Which of the following is FALSE concerning darkfield microscopy?

Accepted Answer

A)  Contamination in the medium can scatter light. 
B)  It can be used to identify spirochetes. 
C)  Images are dark against a light background. 
D)  High resolution cannot be achieved.

Question 15

Bacteria that grow as rods are commonly referred to as ________,whereas bacteria that grow as spheres are known as ________.

Accepted Answer

The answer of Bacteria that grow as rods are commonly...

Question 16

A(n)________ microscopy microscope produces halos of bright lights against a dark field.

Accepted Answer

A)  compound light 
B)  electron 
C)  fluorescence 
D)  darkfield

Question 17

You complete a Gram stain on Gram-positive bacteria;however,you over-decolorize your sample.What color will your bacteria be at this point?

Accepted Answer

A)  purple 
B)  colorless 
C)  pink 
D)  blue

Question 18

In the figure below,which depicts cocci in chains?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  none of the labeled areas

Question 19

In the figure below,line "C" points to the microscope's

Accepted Answer