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Microbiology Chapter 3 potential questions

front 1

A cell may allow a large or charged chemical to move across the cytoplasmic membrane, down the chemical's electrical and chemical gradients, in a process called _____________.

  1. active transport
  2. facilitated diffusion
  3. endocytosis
  4. pinocytosis

back 1

2. facilitated diffusion

front 2

Which of the following is most associated with diffusion?

  1. symports
  2. antiports
  3. carrier proteins
  4. endocytosis

back 2

3. carrier proteins

front 3

Which of the following is not associated with prokaryotic organisms?

  1. nucleoid
  2. glycocalyx
  3. cilia
  4. circular DNA

back 3

3. Cilia

front 4

which of the following statements is true?

  1. The cell walls of bacteria are composed of peptidoglycan.
  2. Peptidoglycan is a fatty acid.
  3. Gram-positive bacterial walls have a relatively thin layer of peptidoglycan anchored to the cytoplasmic membrane by teichoic acids.
  4. Peptidoglycan is found mainly in the cell walls of fungi, algae, and plants.

back 4

1. The cell walls of bacteria are composed of peptidoglycan.

front 5

Which of the following is not a function of a glycocalyx?

  1. It forms pseudopods for faster mobility of an organism
  2. It can protect a bacterial cell from drying out
  3. It hides a bacterial cell from other cells
  4. It allows a bacterium to stick to a host

back 5

1. It forms psuedopods for faster mobility of an organism.

front 6

Bacterial Flagella ____________.

  1. are anchored to the cell by a basal body.
  2. are composed of hami.
  3. are surrounded by an extension of the cytoplasmic membrane.
  4. are composed of tubulin in hollow microtubules in a "9 + 2" arrangement

back 6

1. are anchored to the cell by a basal body.

front 7

Which cellular structure is important in classifying a bacterial species as Gram positive or Gram negative?

  1. flagella
  2. cell wall
  3. cilia
  4. glycocalyx

back 7

2. cell wall

front 8

Gram positive bacteria ___________.

  1. have a thick cell wall, which retains crystal violet dye
  2. contain teichoic acids in their cell walls
  3. appear purple after Gram staining
  4. all of the above

back 8

4. all of the above

front 9

Endospores ____________.

  1. are reproductive structures of some bacteria
  2. occur in some archaea
  3. can cause shock, fever,and inflammation
  4. are dormant, resistant cells

back 9

4. are dormant, resistant cells

front 10

Glycocalyx

back 10

"sweet cup" composed of polysaccharides and/or polypeptides

front 11

Flagella

back 11

Long whip

Made of tubulin in eukaryotes

Made of flagellin in bacteria

front 12

Axial filaments

back 12

Responsible for motility of spirochetes

front 13

Cilia

back 13

Made of tubulin in eukaryotes

front 14

Fimbriae

back 14

Bristlelike projections found in quantities of 100 or more

front 15

Pili

back 15

Responsible for conjugation

Extensions not used for cell motility

front 16

Hami

back 16

Numerous "grappling-hook" projections