BIOS 225 Chapter 3 - -its DNA is not encased in a membrane -it has a...

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BIOS 225 Chapter 3

• Which of the following is not a characteristic of bacteria?

-its DNA is not encased in a membrane -it has a cell wall made of peptidoglycans or other distinct chemicals -it does not have membrane bound organelles -its DNA is wrapped around histones –Answer its DNA is wrapped around histones

• Name the two functions of bacterial appendages

–Answer attachment and motility

• Bacterial cells could have any of the following appendages except

cilia

• Spriochetes have a twisting and flexing locomotion due to appendages called

–Answer periplasmic flagella

• What is another name for periplasmic flagella?

–Answer axial filaments

• What anchors a flagellum into the bacterial cell envelope?

–Answer basal body

• What is the term that refers to the presence of flagella over the cell surface?-

–Answer Peritrichous 1 / 2

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• What is the term that refers to the presence of a tuft of flagella emerging from the same site?

–Answer lophotrichous

• Chemotaxis refers to the ability to

–Answer move in response to a chemical

• A bacterial cell exhibiting chemotaxis probably has

–Answer flagella

• What are the three parts of the bacterial flagellum in order from cytoplasm to external

environment?–Answer basal body, hook, filament

• Movement of a cell toward a chemical stimulus

–Answer Positive chemotaxis

• The short, numerous appendages used by some bacterial cells for adher- ing to surfaces

–Answer fimbriae

• The transfer of genes during bacterial conjugation involves rigid, tubular appendages called

–Answer sex pili

• Which structure protects bacteria from being phagocytized by white blood cells?

–Answer Capsule

• The outcome of the gram stain is based on differences in the cell's

–Answer wall

• Give the order for the correct procedure of a Gram stain

–Answer

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