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Characteristics of Bacteria, Protozoa, and Viruses

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Characteristics of Bacteria, Protozoa, and Viruses

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Questions and Answers

What is the characteristic feature of a nucleoid?

It has a single circular molecule of DNA (correct)

It has mitotic apparatus

It has a rigid exterior cell wall of peptidoglycan

It has a nuclear membrane

What is the main difference between Gram + and Gram - bacteria?

The shape of their cells

The biochemical properties of their cell wall (correct)

The arrangement of their flagella

The type of sterols they contain

What is the purpose of the Gram stain?

To visualize yeast

To differentiate between bacteria and viruses

To identify the morphology of bacteria

To differentiate between different types of bacteria (correct)

What is true about the naming of organisms?

They are named based on their morphology and biochemical/metabolic differences Signup and view all the answers

What is the characteristic feature of bacterial cell walls?

They have a rigid exterior cell wall of peptidoglycan Signup and view all the answers

What is the characteristic of the peptidoglycan layer in Gram-positive bacteria?

Thick and in multiple layers Signup and view all the answers

Which of the following is a component of the outer cell membrane of Gram-negative bacteria?

Lipopolysaccharides Signup and view all the answers

What is the purpose of the safranin counterstain in Gram staining?

To take up the stain in Gram-negative bacteria Signup and view all the answers

Which of the following bacteria is Gram-variable?

Gardnerella vaginalis Signup and view all the answers

What is the main difference between the cell walls of Gram-positive and Gram-negative bacteria?

The thickness of the peptidoglycan layer Signup and view all the answers

Which of the following bacteria is not visualized by Gram staining?

Mycoplasma Signup and view all the answers