11 Questions
What is the characteristic feature of a nucleoid?
It has a single circular molecule of DNA
What is the main difference between Gram + and Gram - bacteria?
The biochemical properties of their cell wall
What is the purpose of the Gram stain?
To differentiate between different types of bacteria
What is true about the naming of organisms?
They are named based on their morphology and biochemical/metabolic differences
What is the characteristic feature of bacterial cell walls?
They have a rigid exterior cell wall of peptidoglycan
What is the characteristic of the peptidoglycan layer in Gram-positive bacteria?
Thick and in multiple layers
Which of the following is a component of the outer cell membrane of Gram-negative bacteria?
Lipopolysaccharides
What is the purpose of the safranin counterstain in Gram staining?
To take up the stain in Gram-negative bacteria
Which of the following bacteria is Gram-variable?
Gardnerella vaginalis
What is the main difference between the cell walls of Gram-positive and Gram-negative bacteria?
The thickness of the peptidoglycan layer
Which of the following bacteria is not visualized by Gram staining?
Mycoplasma
Test your knowledge of the unique features of bacteria, protozoa, and viruses, including their cellular structures, membranes, and characteristics. Learn about the differences between these microorganisms and how they are classified. Identify the distinct traits of each group, from cell walls to motility.
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