mcb2289L Module 04 LearnSmart Lab Quiz

• Question

1 out of 1 points In a negative stain, which of the following is stained? : Cell wall Cytoplasm Background Cell membrane

• Question

1 out of 1 points In a differential staining technique, a ______ is used to remove the primary stain from the bacterial cell wall : Mordant Decolorizer Secondary stain Counterstain

• Question

1 out of 1 points Why might it be important to perform a Gram stain on bacterial cells? As part of the information used to choose an appropriate antibiotic treatment To investigate the cell's organelles In order to determine the species of an infectious agent To make the bacterial grow more efficiently on nutrient media

• Question

1 out of 1 points In the Gram stain, the chemical that fixes dye in or on cells by forming an insoluble compound in referred to as the _______________? mordant decolorizer counterstain primary stain

• Question

1 out of 1 points In order to withstand hostile conditions and facilitate survival, some bacteria produce resistant structures

known as:

: Ribosomes Endospores Centrioles Flagella

• Question

1 out of 1 points Staining allows for visualization of bacterial cells because it increases contrast during microscopic imaging? : True False

• Question

1 out of 1 points The purpose of heat fixation is to _______. : Adjust the morphology of the organisms on the slide Encourage growth of bacterial cells on the slide Inactivate and adhere microorganism placed on the slide Harden the bacteria so that they are not destroyed by the staining procedure

• Question

1 out of 1 points Gram negative cell walls contain a thin layer of peptidoglycan whereas Gram positive cell walls contain a thick layer of peptidoglycan. : True False

• Question

1 out of 1 points During a simple stain, what will happen in the heat fixation step is omitted? : The cells will not take up the dye The cells will be destroyed by the staining process The cells may wash off the slide The cell morphology will change

• Question

1 out of 1 points All of the following are true regarding bacterial smears EXCEPT : Preparation of bacterial smears is required for bacterial staining procedures Bacterial smears provide scientist with the means to look at microorganisms Bacterial smears are used to treat infectious diseases Preparation of smears disperses bacterial cells on a slide so that individual cells can be visualized under the microscope

• Question

1 out of 1 points A simple stain provides enough information

about a microbe to clearly identify its species:

: True False

• Question

1 out of 1 points ________ is used to stain the endospore in the endospore staining procedure : Methylene blue Crystal violet Malachite green Safranin

• Question

1 out of 1 points Staining techniques do NOT provide information on which of the following structures? : Inclusions Ribosomes Capsule Cell wall

• Question

1 out of 1 points Encapsulated organisms are difficult to directly stain because ___ : The capsule easily reacts with most stains The capsule prevents bacteria from adhering to the slide The capsule is easily removed from the cell The capsule is not permeable to most stains

• Question

1 out of 1 points Spherical cells arranged in chains are called __________. : Staphylococci Streptobacilli Spirillium Streptococci

• Question

1 out of 1 points The first dye applied in a differential staining technique is referred to as the counterstain : True False

• Question

1 out of 1 points Gram negative cells appear purple after Gram staining whereas gram positive cells appear pink : True False

• Question

1 out of 1 points In the Acid-fast stain, non-acid-fast bacteria appear pink under the microscope : True False

• Question

1 out of 1 points Stains are commonly used for all of the following EXCEPT : The pathogen identification process The diagnosis of disease The classification of organisms The treatment of disease

• Question

20 1 out of 1 points Which of the following diseases

are caused by acid-fast bacterium:

: HIV

Influenza Cholera Tuberculosis (TB)