Question 1

The bacterium
E.coli swims in a straight line,called a __________,for a few seconds; then it stops,tumbles,then swims away in a new direction.

Accepted Answer

The answer of The bacterium
E.coli swims in a straight line,called...

Question 2

Proteinacious projections from the surface of a bacterium that are used to mediate conjugation are called sex __________,whereas projections that mediate attachment to surfaces such as host cells are called __________.

Accepted Answer

The answer of Proteinacious projections from the surface of a...

Question 3

If you remove the peptidoglycan layer from a Gram positive cell,it would still stain purple with a Gram stain.

Accepted Answer

The peptidoglycan layer is what gives Gram positive cells their ability to retain the crystal violet stain in the Gram stain. Without this layer, the cell would not stain purple and may not be able to retain the stain at all.

Question 4

Small circular DNA molecules capable of replicating and containing genes that are useful but not necessary to the bacterium are called __________.

Accepted Answer

The answer of Small circular DNA molecules capable of replicating...

Question 5

In many spirochetes,multiple flagella combine to form a bundle known as a(n)____________ fibril,which winds around the cell and confers motility on the cell.

Accepted Answer

The answer of In many spirochetes,multiple flagella combine to form...

Question 6

Which of the following structures is NOT found in an endospore?

Accepted Answer

Endospores do not have a capsule, which is a layer of polysaccharides surrounding the cell wall in many bacterial species. Endospores have a coat, exosporium, and core, which are specialized structures for surviving harsh environmental conditions.

Question 7

Some species of aquatic bacteria use inclusion bodies known as ________ to orient themselves in Earth's magnetic field.

Accepted Answer

The answer of Some species of aquatic bacteria use inclusion...

Question 8

The rotation of bacterial flagella is powered by ATP hydrolysis.

Accepted Answer

The rotation of bacterial flagella is powered by the flow of protons across the bacterial cell membrane (proton motive force), not by ATP hydrolysis.

Question 9

The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.

Accepted Answer

The answer of The layers of peptidoglycan of the bacterial...

Question 10

_______ are the site of protein synthesis in the cell.

Accepted Answer

The answer of _______ are the site of protein synthesis...

Question 11

__________ is the main part of the process through which a vegetative cell is formed from an endospore.

Accepted Answer

The answer of __________ is the main part of the...

Question 12

Matching: Match the definition with the word.
1)monotrichous
2)peritrichous
3)lophotrichous
4)amphitrichous
a.a single flagellum
b.a single flagellum at each pole of an organism
c.a cluster of flagella at one or both ends of an organism
d.a relatively even distribution of flagella over the entire surface of the bacterium

Accepted Answer

The answer of Matching: Match the definition with the word.
1)monotrichous
2)peritrichous
3)lophotrichous
4)amphitrichous
a.a...

Question 13

During the assembly of the flagellar filament,the flagellin protein monomers assemble at the cell proximal base of the flagellum.

Accepted Answer

Flagellin protein monomers assemble at the distal end of the flagellum, not the cell proximal base.

Question 14

__________ is the process through which endospores are formed within a vegetative cell.

Accepted Answer

The answer of __________ is the process through which endospores...

Question 15

The most widely accepted current model for membrane structures is called the __________ model.

Accepted Answer

The answer of The most widely accepted current model for...

Question 16

Sedimentation coefficients are proportional to the molecular weight of a particle and are not affected by the volume and shape of the particle.

Accepted Answer

Sedimentation coefficients are affected by both the molecular weight and the size and shape of a particle. Smaller and more compact particles will have higher sedimentation coefficients than larger and more elongated particles of the same molecular weight.

Question 17

Bacterial flagella are composed of three parts: the ______ body,which is embedded in the cell,the hook,and the _______,which is the longest part of the flagellum.

Accepted Answer

The answer of Bacterial flagella are composed of three parts:...

Question 18

Some photosynthetic bacteria produce gas vacuoles that regulate their buoyancy but contain no lipid.

Accepted Answer

Gas vacuoles are composed of a protein shell and do not contain lipids. They serve to regulate buoyancy in photosynthetic bacteria by controlling the amount of gas within the cell.

Question 19

Intracellular granules of organic or inorganic material that are stockpiled by bacteria for future use are called __________.

Accepted Answer

The answer of Intracellular granules of organic or inorganic material...

Question 20

Bacteria have a region of the cytoplasm known as the __________,which is not bounded by a membrane but contains the chromosome.

Accepted Answer

The answer of Bacteria have a region of the cytoplasm...

Quiz 3: Bacterial Cell Structure

The bacterium E.coli swims in a straight line,called a __________,for a few seconds; then it stops,tumbles,then swims away in a new direction.

Proteinacious projections from the surface of a bacterium that are used to mediate conjugation are called sex ,whereas projections that mediate attachment to surfaces such as host cells are called .